JPS599845B2 - Strain rate program controlled tensile testing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a constant strain rate tensile test device, and more specifically, the present invention relates to an improvement of a constant strain rate tensile test device. The present invention relates to a device for conducting a tensile test while being controlled according to a predetermined program.

Among the various tests performed to determine the mechanical properties of polymer materials, the most widely used test is the tensile test.

Tensile tests of polymeric materials are conducted in a wide temperature range of low temperature, room temperature, and high temperature, and tensile test apparatuses suitable for each temperature range have been proposed. In order to measure stress, elongation, etc. in a tensile test, a film or sheet sample is tightly clamped between two sets of clamps, and the mutual spacing between these clamps is changed at a constant speed to cause the sample to be stretched at a constant rate. An apparatus for stretching at a high speed and recording the stress, strain, time, and diagram at that time is known, for example, as described in Japanese Patent Publication No. 44-6744.

The device described in this publication can be fully utilized when the total amount of sample deformation is small, but when the total amount of sample deformation is large, the maximum overall length of the device may be limited, especially if a constant temperature bath is attached. There are limits depending on the size of the thermostatic chamber.
Tensile tests are often conducted under high temperature conditions, and the sample holding clamps of conventional tensile test equipment are parallel plate or model types, and both ends of the sample are simultaneously held by the holding clamps at high temperatures. Then, the sample sag due to thermal expansion, and there is a problem that stress cannot be measured in areas where the amount of stretching is small.

In such a case, first, only one end of the sample is held with a holding clamp, and when the sample reaches the measurement temperature, the other side of the sample is held. However, with conventional parallel plate or wedge-shaped clamps, it is necessary to open the door of the thermostatic chamber to operate them, and during this operation, the temperature of the thermostatic chamber inevitably decreases, and the sample is again brought to the measurement temperature. It is necessary to raise the temperature to Furthermore,
If you want to find the amount of strain that the sample can recover from, open the door of the thermostatic chamber after stretching, remove one of the holding clamps holding the sample from the sample, and let the temperature of the sample drop. After raising the temperature to the measurement temperature again, the amount of shrinkage of the sample is measured to determine the amount of recovery strain of the sample. However, this method has the disadvantage that stress relaxation is ignored, resulting in a value that is far from the true recovery strain.
Recently, a roll clamp (RO
A tensile test device equipped with a tatiOnalClaJr]P) has been proposed (for example,
(See No. 8). This device is suitable for performing tensile tests on rod-shaped samples, and there is no mention of the details of the clamp mechanism used when pulling sheets or films. Depending on the type of polymer material, stress, elongation, etc.
Although some conditions depend on time or strain rate, it is necessary to keep the strain rate constant when performing a tensile test on a sample with such a deposit.

This requirement cannot be met by a constant pulling rate. This is because when the sample is pulled at a constant pulling speed (υ), the length (L(t)) after t seconds has elapsed from the initial length (LO) is L(t) = LO + υ - This is because the deformation that occurs within a unit time gradually decreases because the gauge distance increases as t. For example, if the length of the sample increases ten times, the strain rate decreases to one-tenth of the initial strain rate. A stretching process is involved when producing films or filaments from polymeric materials, or when forming films into molded products by thermoforming.

In the stretching in these steps, the strain rate and temperature of the sample vary. For example, when manufacturing a molded product from a film by thermoforming, the sheet is heated to a moldable temperature and then vacuum and/or compressed air is applied to the sheet to stretch the sheet and form it into the desired shape. . If this stretching process during molding is reproduced using a tensile testing device, the stress, strain, time, and diagram of this stretching process can be obtained.

These data can be utilized to examine appropriate sheet materials and appropriate molding conditions. However, until now, there has been no known program-controlled tensile testing device that can arbitrarily change the strain rate applied to a sample over time. In view of this situation, the present inventors developed a tensile testing device that does not increase the size of the device and allows easy attachment and detachment of the sample, and a program that allows the strain rate applied to the sample to be arbitrarily changed over time. As a result of intensive studies aimed at providing a controlled tensile testing device, the present invention has been completed.

The gist of the present invention is to include a sample fixing clamp connected to a load detection device, and a sample tensioning roll clamp consisting of a pair of rolls provided opposite to the sample fixing side ramp. The clamp is
Specimen clamping mechanism connected to a drive motor so as to be rotatable in mutually opposite directions, and provided with means for approaching and separating the roll gap; optional input of an arbitrarily predetermined strain rate as a function of time; A function generator, a function divider that divides the input power so that an input arbitrary function falls within the speed change range of the drive motor, and a signal sent from the function divider to set the rotation speed of the drive motor to a high speed state. A drive motor control mechanism consisting of an inverting circuit that has the function of returning the drive motor to a low speed state, and a PID amplifier that controls the rotation speed of the drive motor to an input function value: A sample pulling roll that is rotated by the operation of the drive motor. A detection mechanism consisting of a load detection device that detects the tension generated when stretched by a clamp, and a stretching amount detection device that detects the amount of stretching of this sample; It resides in the device.

Hereinafter, the strain rate program controlled tensile testing device according to the present invention will be explained in detail based on the drawings.
The following examples are not intended to be limiting unless they exceed the gist thereof.

Fig. 1 is a schematic side view of an example of a tensile test device according to the present invention, Fig. 2 is a schematic plan view of a part of Fig. 1, Fig. 3 is a schematic vertical cross-sectional side view of the - part of Fig. 2, and Fig. 4 is a schematic side view of a tensile test device according to the present invention. Figure 5 shows an example of a function set in an arbitrary function generator, and Figure 6 shows a function generated by the arbitrary function generator divided by a function divider and partially inverted by an inversion circuit. Here is an example of a function.

In the figure, 1 is a load detection device, 2 is a sample fixing side clamp, 3 is a sample, 4 is a fixed roll, 5 is a moving roll, 6 is a fixed roll drive shaft, 7 and r are rotary bearings, and 8 and 8' are respectively The brackets of the rotation bearings 7, 7' are shown.

9 is a moving roll drive shaft, 10 is a taper pin, 11 is a universal joint, 12 is a pin, 13 is a drive shaft, 14
, 15 are gears, 16, 15 are rotation bearings of the drive shafts 9, 13, respectively, and 17, 1γ are rotation bearings 16, 1γ, respectively.
16' slide bracket is shown.

18 is a guide shaft of the drive shaft 9; 19 is a moving shaft of the drive shaft 9; 2
0 is a dedicated bearing for the moving shaft 19, 21 is a bracket for the bearing 20, 22 is a connecting rod, 23 is an air cylinder, 24 is a base plate, 25 is a column, 26 is a constant temperature oven, 27 is a door, 28
29 indicates a sample tray, 29 indicates a sample tube, and 30 indicates a sample tip.

31, 32 are servo motors, 35, 36 are tacho generators, 39, 40, 41, 42 are reducers, 43,
44, 45, 46 are clutches, 47 is a brake, 48 is a slit disk, 49 is a pulse sensor, 50 is a preset counter, 51 is a D/A converter, 52 is a stretching amount output terminal, 53 is a strain meter, 54 is the load output terminal,
Reference numeral 55 indicates a solenoid valve, 56 a compressed air source, 57 a switch, 58 a clutch/brake/electromagnetic valve manual operator, and 59 a terminal connected to the clutches 43, 44, 45, 46 and the brake 4T.

60 is an arbitrary function generator, 62 is a switch, 63 is a function divider, 64 is a switching signal generator, 65 is an inverting circuit, 66 is a switching circuit, 67 and 68 are PID amplifiers, 69 and 70 are servo amplifiers, and 71 is a Terminals 72 and 73 coupled to clutches 43, 44, 45 and 46 respectively represent 10g amplifiers.

The strain rate program controlled tensile test device according to the present invention includes a load detection device 1 and a sample fixing side clamp 2 connected to the load detection device, and further includes a pair of sample fixing side clamps 2 facing the sample fixing side clamp 2. A sample tensioning roll clamp consisting of rolls 4 and 5 is provided.

As shown in FIG. 1, the load detection device 1 is supported by a column 25 on one side, and is provided with a sample fixing side clamp 2 on the other side.

The sample fixing side clamp 2 can be of a conventionally known structure such as a wedge type, a parallel plate type, or an eccentric roll type. The apparatus according to the present invention fixes one end of the sample 3 with the sample fixing clamp 2 and the other with a pair of roll clamps, and rotates the rolls 4 and 5 in opposite force directions to hold the sample. It has a tensile structure. One of the pair of rolls is called a fixed roll, which can rotate freely but cannot make any other movements. The fixed roll 4 is attached to a drive shaft 6 and attached to a base plate 24 by rotary bearings 7, γ and brackets 8, 8'.
The other roll 5 can not only rotate, but also press the sample against the fixed roll 4 side or separate it from the sample 3. The pair of rolls are configured to rotate with the sample sandwiched therebetween.

The moving roll 5 is connected to a drive shaft 9, and this drive shaft 9 is attached to a rotation bearing 16. A taper pin 10 and a universal joint 11 are attached to one end of the drive shaft 9.
is provided, and is incorporated into the slide bracket 17 together with the rotation bearing 16. The other end of the universal joint 11 is connected to a pin 12 and a drive shaft 13.
The drive shaft 13 is incorporated into the bracket 1r together with a rotary bearing 15, so that it can rotate freely. The drive shaft 6 and the drive shaft 13 are configured to rotate simultaneously by gears 14 and 15. That is, when the drive shaft 6 is rotated by some means, the gear 14 rotates, this rotation is transmitted to the drive shaft 13 by the gear 15, and as a result,
The fixed roll 4 and the moving roll 5 can be rotated simultaneously. In such a tension roll clamp, one side is a fixed roll and the other side is a moving roll, and the means for moving the moving roll toward and away from the fixed roll can be assembled using the following structure.

That is, a moving roll guide shaft 18 is provided above or below the moving roll 5 in a direction perpendicular to the axis of the fixed roll 4, and is connected to the moving roll 5.
It is preferable to provide a compressed air cylinder mechanism for approaching and separating the moving rolls in a direction perpendicular to the axis of the moving rolls. In this case, when the movable roll guide shaft 18 is provided below the movable roll 5, it is not necessary to provide it directly below the movable roll 5, but as shown in FIG. It is preferable that the drive shaft 9 and rotation bearing 16 in the slide bracket 17 are moved together. As shown in FIG. 2, the moving roll approaching/separating compressed air cylinder mechanism is composed of a moving shaft 19 connected to a slide bracket 17 of a drive shaft 9, a connecting rod 22, and an air cylinder 23. It is preferable that it be supported by a bearing 20 attached to a base plate 24 and protected by a bracket 21. When compressed air is supplied to the head side of the air cylinder 23, the piston inside the cylinder is moved to the right in Figure 2, and the movement is as follows:
The connecting rod 22 reaches the sliding bracket 17 of the drive shaft 9 via the moving shaft 19.

As a result, the slide bracket 17 of the drive shaft 9 moves toward the drive shaft 6 along the movable roll guide shaft 18, and the movable roll 5 is pressed against the fixed roll. When compressed air is introduced into the connecting rod 22 side of the air cylinder 23, the piston within the cylinder can be moved to the left. The strain rate program controlled tensile test device according to the present invention is equipped with a program control means that can arbitrarily change the strain rate applied to the sample over time.

The program control means that can arbitrarily change the strain rate applied to the sample over time is: (a) The rotation of the roll clamp for pulling the sample is controlled by multiple servo motors and multiple reducers with different speed change ranges. and a mechanism that changes the speed of the clamp (mouth It is composed of 5 parts.

In order to vary the rotation speed of the sample pulling roll clamp over a wide range, a plurality of servo motors and a plurality of speed reducers with different speed change ranges may be selectively combined.

In the tensile test, the test is carried out by controlling the rotational speed of the roll clamp, and the rotational speed N is required to have a wide variable speed range and to be highly accurate.

In the apparatus according to the present invention, a plurality of servo motors are installed in order to meet this requirement. FIG. 4 shows an example including two servo motors 31 and 32. It is preferable that each of these servo motors has a variable speed range of 1×N to 10×N and uses a range with high rotation accuracy. These servo motors are combined with a plurality of reducers having different speed change ranges.

FIG. 4 shows an example in which two reduction gears are combined for one servo motor. The servo motor 31 includes a reducer 39 that reduces the rotation speed N to 1/10S, and a 1A0
The servo motor 32 includes a reducer 40 that decelerates the speed.
By combining the speed reducer 41 that decelerates to /102 and the speed reducer 42 that decelerates to 1/1, the final rotational speed given to the roll clamp can be continuously controlled in the range of 0.001 x N to 10 x N. You can change gears by changing the speed. For example, when the servo motor 31 and reducer 39 are combined, the
A rotation speed of ×N to 0.01 × N can be obtained, and when the servo motor 32 and reducer 41 are combined, the rotation speed is 0.0
Rotational speeds from 1XN to 0.1XN are obtained.

When the servo motor 31 and reducer 40 are combined,
A rotation speed of 0.1×N to 1XN can be obtained, and when the servo motor 32 and reducer 42 are combined,
A rotation speed of 0×N is obtained. The rotational speed of the clamp can be changed continuously within the range of 0.001×N to 10×N by switching the clutches 43, 44, 45, and 46.

In other words, by connecting two servo motors alternately to the roll clamp via the speed reducer 42, even though the speed range of the servo motors is 10 times N to 10 N, it is sufficiently wider than that. can be applied to the roll clamp. Servo motor 31,
32 are connected to tachogenerators 35 and 36, respectively, and each tachogenerator generates a voltage of V to 10 volts when the servo motor rotates at N to 10N, and via 10g amplifiers 72 and 73, The voltage varies logarithmically from 0 to 1 volt and feeds back to the servo amplifiers 69 and 70.

The device according to the present invention can change the rotation of the sample tensioning roll clamp over a wide range using the above-mentioned mechanism. Equipped with a mechanism to change speed. The strain rate applied to the sample is set in the arbitrary function generator 60 in advance.

An example of functions set in the arbitrary function generator 60 is shown in FIG. Figure 5 A shows an example in which the strain rate rises in a parabolic curve in the early stage, reaches the maximum value in the middle stage, and decreases in the latter stage in a curve opposite to the initial stage. , Figure 5 (c) shows an example in which the strain rate increases in proportion to time.The strain rate increases in proportion to time up to the middle, reaches the maximum value in the middle, and in the second half it becomes the opposite of the first half. Figure 5.2 shows an example in which the strain rate decreases in proportion to time.In the early stage, the strain rate increases in proportion to time, remains at its maximum value in the middle stage, and at the end stage is different from the initial value. On the contrary, examples are shown in which the strain rate is decreased in proportion to time. It goes without saying that the functions set in the arbitrary function generator 60 are not limited to the four types shown here, and can be changed in various ways, such as an exponential function, depending on the purpose of the test. The strain rate applied to the sample changes over time according to the strain rate one-hour function set in the arbitrary function generator 60, and the maximum value thereof is larger than the speed change range of each servo motor. In order to rotate the roll clamp up to this range, the set value is divided into values corresponding to the speed change range of each servo motor.

Therefore, the individual servo motors can be rotated in accordance with the divided strain rate one-hour functions within their rotational speed change ranges. This division is performed by a function divider 63. The function divider 63 further converts the divided set value into a value corresponding to the speed change range of the servo motor, for example from 0 to 1 volt, and supplies it to the addition point of the servo amplifier together with the feedback signal. If we set the function represented by A in Figure 5 in the arbitrary function generator and rotate the roll clamp according to this function,
In the process of O-P-Q-R-S, the roll clamp rotates from a low-speed state to a high-speed state, and the S-T-
In the U-1W process, the motor rotates from a high speed state to a low speed state.

This rotation is achieved by alternately using two servo motors. That is, one servo motor is (0-P
), (Q-R), (S-T) and (U-), and the other servo motor shares the sections of (P-Q), (R-S).
), (T-U) and (V-W).

The rotation speed of the servo motor in each section is N-1
0N rotation or 10N-N rotation. 1A03 in the (0-P) and (-W) sections, (P-Q), and (U-)
In the section, 1/102, (QR) and (T-U)
In the section, 1/10, . Furthermore, (R-S) and (S
-T) section, through a reducer with a 1A reduction ratio,
By rotating the roll clamp, a rotation range of 0.001N to 10N is obtained as described above. One of the servo motors is N to 1 in a certain section of the set function.
After completing 0N rotations or 10N-N rotations, it is necessary to decelerate or accelerate to N or 10N rotations and wait before reaching the next assigned section.

Therefore, once the servomotor of one force has completed its operation in a given section, this function can be reversed while the other servomotor is operating in the next section of the function according to the function of that section. , and waits at N or 10N rotations, which is the number of rotations at the start of the next division to be assigned.
In this way, an inversion circuit is used to cause the servo motor to reverse the function and wait for N or 10 N rotations before reaching the starting point.

In other words, the servo motor that rotates from the function divider directly through the PID amplifier and servo amplifier rotates the roll clamp, and the servo motor that rotates through the PID amplifier and servo amplifier via the inverting circuit is not connected to the roll clamp. , tracing the function backwards, N or 1
The engine will wait in a state where the rotation is set to 0N. A mechanism for changing the strain rate according to a predetermined function can be operated by the following procedure.

When the function represented by A in FIG. 5 is set in the arbitrary function generator 60 and its output is input to the function divider 63, the input voltage is divided by the function divider 63 into 0 to 1 volts. Next inverting circuit 65 or PID amplifier 67, 68
supplied to

The division takes place in accordance with a signal issued by a switching signal generator, which simultaneously switches the clutches 43, 44, 45.
, 46 and the switching circuit 66 are selected or switched. That is, when function A is supplied to the function divider 63, this function is divided into 0→1(0-P), 1→2(P-Q
), 2 → 3 (Q7R), 3 → 4 → 3V (R-S-T),
3→2(T-U), 2→1V(U-) and 1→0(-
W) is divided into seven parts.

Figure 6 shows how 01, 12, 23, 343 are divided.
, 32, 21, and 10 are shown as solid lines. The divided functions are supplied to contacts A and D of the switching circuit 66 as they are, and to B and C of the switching circuit 66 via the inverting circuit 65.
It can be divided into two routes: In the inverting circuit 65,
In response to the divided function, the polarity is reversed, and the limiter cuts off the ground near 1 volt and the bottom near 0 V volt, and outputs the voltage from 0 to 1. The functions passed through the inversion circuit 65 in this way are shown in FIG. 6 as 01, 12,
23, 343, 32, 21, and 10 are indicated by dotted lines.

These reference voltages of 0 to 1V volts are applied to the servo motor 3
1 and 32 are controlled to N to 10N. The function is O~
While the output of the function divider 63 is changing over time between 1 V volts, that is, in the range indicated by 01 in FIG. 6, the A and C sides of the switching circuit are on, and the P
The 01 function and the 01 function shown in FIG. 5 are supplied as reference values to the ID amplifier 67 and the PID amplifier 68, respectively, and are compared with the respective feedback voltages. Following this, they rotate by N→10N rotations and 10N→N rotations, respectively.
At this time, only clutch 43 is connected to the load, and the others are in a disconnected state. In other words, the load mechanism is decelerated to 1/103 by the reducer 39 and has a power of 0.001.
Rotation that follows the 01 function is transmitted by ×N to 0.01XN rotations. When the function reaches 1 volt, the function divider 6
The output of 3 changes to the 12 function shown in FIG. 6, and at the same time, the contacts of the switching circuit 66 switch to B and D, and only the clutch 45 is connected to the load, and the others are disconnected. The rotation of the servo motor 32 is controlled by a speed reducer 41.
/102, following the 12 function, 0.01
xN to 0.1 x N rotations and is transmitted to the load mechanism. The clutches 43, 44, 45, 46 are switched in response to signals sent from the switching signal generator 64 each time the function becomes 1 volt, 2 volts, . . . . Division of the function set in the arbitrary function generator 60 can be performed by switching the bias of the input amplifier of the function divider 63 using the sequence circuit of the switching signal generation circuit 64.

FIG. 5 shows an example where the function y=f(t) satisfies O≦y≦4. In this way, by setting an arbitrary function to the arbitrary function generator, the roll clamp can be rotated in accordance with the arbitrary function.

Since the strain rate applied to the sample is proportional to the rotational speed of the roll clamp, the strain rate can be changed to follow any program. Since the sample is stretched between roll clamps, the sample is ultimately stretched at a preprogrammed strain rate. The amount of stretching of the sample 3 is determined by attaching a slit disk 48 to the drive shaft 6, and detecting the slit in the disk by a pulse sensor 49.
The counter 50 adds up.

The number of slits in the slit disk 48 is preferably set in a specific relationship with the circumference of the opening 4. For example, the circumference of the roll is 10
If the diameter is 0 mm and the number of slits in the slit disk is 100, then one slit represents 1 mm. The amount of stretching of the sample 3 is determined by converting the amount accumulated in a preset counter 50 into an analog value using a D/A converter 51, connecting it to a stretching amount output terminal 52, and using it for recording or control.

The force generated when the sample 3 is stretched is applied to the sample fixing side clamp 2.
is connected to the load detection device 1, connected to the strain meter 53, and connected to the load output terminal 54, which is used for recording or control.

If the switch 57 is changed from G (automatic) to H (manual), clutches 43, 44, 45, 46, brake 4
7. The solenoid valve 55 can be manually operated by the clutch/brake solenoid valve manual operation circuit 58. Clutch manual operation switches are provided independently for the clutches 43, 44, 45, and 46, and when the switch of any clutch is turned on, the electromagnetic brake 47 is turned off, the roll clamp mechanism is connected to the drive mechanism, The rolls 4 and 5 can be rotated at any rotation speed (strain speed).

When the clutch switch is turned off, the electromagnetic clutch is disengaged, the electromagnetic brake is applied, the roll clamp mechanism and the drive mechanism are separated, and the rotation of the roll clamp can be forcibly stopped. When the solenoid valve is turned on, compressed air can be sent to the head side of the air cylinder 23 to press the moving roll 5 toward the fixed roll 4 side.

When the solenoid valve is turned off, compressed air can be sent to the connecting rod 22 side of the air cylinder 23 to separate the moving roll 5 from the fixed roll 4. When carrying out a tensile test using the testing apparatus according to the present invention, the distance between the rolls 4 and 5 is widened by manual operation, the sample 3 is held in the sample fixing side clamp by hand, and then the solenoid valve switch is turned on. Turn on the sample 3 and clamp it between the roll clamps 4 and 5 to mount the sample. The clutch and brake switches are turned off, the roll drive mechanism is rotated at a predetermined number of rotations, and then the clutch switch is turned on to rotate the roll clamp. If the switch 57 is immediately switched to G (automatic) and the switch 62 is set to F, it becomes possible to perform a tensile test while changing the strain rate over time according to a predetermined function. With the apparatus according to the present invention, in addition to performing a tensile test in which the strain rate is controlled by a program, it is possible to determine the amount of recovery strain of a sample.

To measure the stress relaxation of a sample using the apparatus of the present invention, set the switch 62 to E, set the speed until the set stretching amount is reached using the arbitrary function generator 60, and set an arbitrary pulse to the preset counter in advance. The brake 47 is activated by the signal output from the preset counter 1 in the preset counting state, and the electromagnetic clutch is released. 5 should be stopped.

In this case, the switch 57 is set to the G automatic side.
To measure the amount of recovery strain of the sample, connect the terminal of the switch 59 to the solenoid valve, stop the rotation of the rolls 4 and 5, and set the preset counter as in the case of measuring stress relaxation. The solenoid valve 55 of the air cylinder 23 is switched by a signal transmitted from the air cylinder 23 to separate the moving roll from the fixed roll 4.

As a result, one end of the sample becomes free, the sample recovers its strain, and the amount of recovered strain can be measured. If the switch 57 is set to G, it will be automatically operated. The constant strain rate program controlled tensile test device according to the present invention has the following advantages, and its industrial utility value is extremely large.

1 By adjusting the air pressure of the air cylinder, the force for clamping the sample can be changed arbitrarily.
Even if the sample is stretched and its thickness decreases, the sample can always be clamped with a constant pressure.

2.Since the sample ramp mechanism is adopted using a combination of an air cylinder and a solenoid valve, the sample can be quickly and easily attached and detached by simply turning on and off an electric switch.

3. Even when performing high-temperature tensile tests, the sample can be clamped and unclamped without opening the door of the thermostatic chamber, making it possible to obtain various highly accurate data during high-temperature tensile tests. .

4 The strain rate applied to the sample can be arbitrarily changed as a function of time, so when producing films or filaments from polymeric materials or thermoforming films, the stretching process applied to the polymeric material can be controlled. It can be reproduced, and the various data obtained can be used to examine appropriate materials and appropriate molding conditions.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of an example of the tensile test device according to the present invention, Fig. 2 is a schematic plan view of a portion of the plate shown in Fig. 1, Fig. 3 is a schematic vertical cross-sectional view of a portion of the plate shown in Fig. 2, and Fig. 4 is a block diagram. , Figure 5 is a diagram showing an example of a function set in the arbitrary function generator, and Figure 6 is a diagram showing an example of a function generated by the arbitrary function generator, divided by a function divider, and partially inverted by an inversion circuit. Here is an example. 1...Load detection device, 2...Sample fixing side clamp, 3...Sample, 4...Fixed roll, 5...Movement Roll, 6... Fixed roll drive shaft, 9... Moving roll drive shaft, 1
1...Universal joint, 13...
... Drive shaft, 14, 15... Gear, 18...
... Guide shaft of drive shaft 9, 19 ... Movement axis of drive shaft 9, 22 ... Connection rod, 23 ...
・Air cylinder, 26... Constant temperature bath, 31,3
2... Servo motor, 35, 36...
...Tacho generator, 39,40,41,42...
...Reducer, 43, 44, 45, 46...
Clutch, 47...Brake, 48...
・Slit disk, 49...Pulse sensor 5
0...Preset counter 1, 51...
・D/A converter, 52... Extension amount output terminal, 5
3...Strain meter, 54...
Load output terminal, 55...Solenoid valve, 56...
...Compressed air source, 57...Switch, 58...
・・Clutch・Brake・Solenoid valve manual operation device, 60・・
...Arbitrary function generator, 62...Switch,
63...Function divider, 64...Switching signal generator, 65...Inverting circuit, 66...
・Switching circuit, 67, 68...PID amplifier, 6
9,70...Servo amplifier, 72,73...
...10g amplifier.

Claims (1)

[Claims] 1 Equipped with a sample fixing clamp connected to a load detection device, and a sample tensioning roll clamp consisting of a pair of rolls provided opposite to this sample fixing side clamp, and the sample tensioning roll clamps are arranged in opposite directions. a sample clamping mechanism rotatably connected to a drive motor and having means for approaching and separating the roll gap; an arbitrary function generator for inputting an arbitrarily predetermined strain rate as a function of time; A function divider divides the input power so that the input arbitrary function is within the speed change range of the drive motor, and the rotation speed of the drive motor is changed from high speed to low speed according to the signal sent from this function divider. A drive motor control mechanism consisting of a reversing circuit that has the function of returning the drive motor to an input function value, and a PID amplifier that controls the rotation speed of the drive motor to an input function value; the sample is stretched by a sample pulling roll clamp that is rotated by the operation of the drive motor. a detection mechanism consisting of a load detection device that detects the tension generated when the sample is stretched; and a stretching amount detection device that detects the amount of stretching of the sample;
A strain rate program controlled tensile testing device characterized by comprising: