JPH0469329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a material testing device that tests a material by applying a load to a test piece using an actuator.

(b) Prior art For example, when performing a fatigue test on a test piece, as shown in Fig. 1 and Fig. 2, a pair of upper and lower plates 1H and 1L are
A testing device in which a machine frame 3 is constructed of a pair of left and right round bars 2 is generally used. This device applies a load to the test piece using an actuator 4, and the actuator 4 is fixed to a lower plate 1L. The test piece is placed between the plates 1H and 1L, and connected to the actuator 4 and the upper plate 1H. The actuator 4 applies a tensile and compressive cyclic load to the test piece, and the reaction force is applied to the plate 1 of the machine frame 3.
It is received and supported by H, 1L. Therefore, the specimen is deformed and subjected to a fatigue test. In addition, as shown in Figures 3 and 4,
There is also a test device in which the machine frame 6 is made up of a rectangular plate 5 having an upper wall 5a and a lower wall 5b. The actuator 4 is fixed to the lower wall 5b of the plate 5, and the test piece is placed between the upper wall 5a and lower wall 5b of the plate 5, and connected to the actuator 4 and the upper wall 5a. The actuator 4 applies a repeated tensile and compressive load to the test piece, and the reaction force is received and supported by the plate material 5 of the machine frame 6.

By the way, in the testing apparatus shown in FIGS. 1 and 3, in order to apply a load to the test piece accurately, it is necessary to provide the machine frames 3 and 6 with high rigidity. The cross-sectional area and material of the machine frames 3, 6 are related to the rigidity of the machine frames 3, 6, and the rigidity is determined by the cross-sectional area and material of the machine frames 3, 6. For this reason, the cross-sectional area and material of the machine frames 3 and 6 must be carefully considered for each test device design. moreover,
In order to accurately center the actuator 4 and the test piece, it is necessary to machine the machine frames 3 and 6 with high precision, but this is not easy to achieve. Due to its structure, it is also limited to make the entire test apparatus compact.

(c) Purpose Therefore, the present invention is to provide a material testing device with which a machine frame can have high rigidity without having to pay particular attention to the cross-sectional area and material of the machine frame. This was done for the purpose of enabling easy processing with high precision and making the entire testing device significantly more compact.

(D) Configuration This invention uses a substantially cylindrical machine frame, and a test piece is housed within this machine frame. An actuator that applies a load to the test piece is fixed to one end of the machine frame, and both ends of the test piece are connected to the actuator and the other end of the machine frame.

(E) Examples Examples of the present invention will be described below. FIG. 5 shows an embodiment of the invention. The test piece TP is housed in a cylindrical machine frame 7, and the actuator 4 is fixed to one end of the machine frame 7. Both ends of the test piece TP are connected to the actuator 4 and the other end of the machine frame 7. In this embodiment, the main body 8 of the actuator 4 is fitted into the inner circumferential surface of the machine frame 7, and the actuator 4 is tightened by screws on the outer circumferential surface of the main body 8 and the inner circumferential surface of the machine frame 7, and is fixed at the bottom edge of the The lower end of the test piece TP is connected to the piston rod 10 of the actuator 4 by a bolt-tightening chuck 9. The upper end of the test piece TP is inserted into the stepped through hole 11 of the machine frame 7, and the screw plug 12
It is tightened by a screw and connected to the upper end of the machine frame 7.

In the apparatus configured as described above, when fluid pressure such as oil pressure is supplied to the main body 8 of the actuator 4, the piston rod 10 reciprocates with respect to the main body 8, and a repeated tensile and compressive load is applied to the test piece TP. The reaction force is received and supported by the upper end of the machine frame 7. Therefore, the specimen TP is deformed and subjected to a fatigue test.

Since this device uses a cylindrical machine frame 7, the machine frame 7 has high rigidity. Therefore, the test piece
Load can be applied accurately to TP. Also,
Since the machine frame 7 is cylindrical, its processing is easy. Therefore, the machine frame 7 can be processed with high precision. As a result, the test piece TP can be accurately centered with respect to the actuator 4. Therefore, the test piece TP can be tested accurately. Furthermore, since the machine frame 7 is cylindrical, the entire device can be made significantly more compact.

It should be noted that various modifications of the present invention are possible in addition to the above-mentioned embodiments. As shown in FIG. 6, the lower end of the test piece TP is connected to the piston rod 10 of the actuator 4 by a bolt-tightening chuck 9, and the upper end of the test piece TP is also connected to the upper end of the machine frame 7 by a bolt-tightening chuck 9. May be connected to
In addition, a sleeve with an inner diameter corresponding to the outer diameter of the machine frame 7 is formed on the main body 8 of the actuator 4, and this is fitted onto the outer circumferential surface of the machine frame 7, so that the inner circumferential surface of the sleeve and the outer circumferential surface of the machine frame 7 are It is also possible to fix the actuator 4 to one end of the machine frame 7 with a screw. Furthermore, as shown in FIGS. 7 and 8, the main body 8 of the actuator 4 may be fitted onto the inner circumferential surface of the machine frame 7 which has been divided into two, and the machine frame 7 may be tightened with bolts or hydraulic jacks 13. good. The actuator 4 is fixed to one end of the machine frame 7 by friction between the outer circumferential surface of the main body 8 and the inner circumferential surface of the machine frame 7. In either case, the load can be applied accurately to the test piece TP, and the test piece
TP can be tested accurately and similar effects can be obtained.

(f) Effects As explained above, according to the present invention, a substantially cylindrical frame is used as the frame of the material testing machine. Therefore, the machine frame can be provided with high rigidity and a load can be accurately applied to the test piece without having to particularly consider the cross-sectional area and material of the machine frame. Machine frames can also be easily machined with high precision. The entire test device can also be made significantly more compact.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional test device, Fig. 2 is a side view of Fig. 1, Fig. 3 is a front view of another conventional test device, Fig. 4 is a side view of Fig. 3, and Fig. 5 is a front view of a conventional test device. The figure is a sectional view showing one embodiment of the present invention, FIGS. 6 and 7 are sectional views showing a modification of FIG. 5, and FIG. 8 is an end view of FIG. 7. TP...test piece, 4...actuator, 7...
...Machine frame.

Claims (1)

[Claims] 1 A test piece is housed in a substantially cylindrical machine frame, an actuator that applies a load to the test piece is fixed to one end of the machine frame, and both ends of the test piece are connected to the actuator and the other end of the machine frame. A material testing device characterized by being connected.