JP6699420B2 - Material tester holder - Google Patents

Description

  The present invention relates to a holder for a material testing machine, and more particularly to a holder for a material testing machine suitable for conducting a material test on a water-containing test piece.

  FIG. 5: is explanatory drawing which shows a mode that a material test is performed with respect to the test piece 101 in the conventional material testing machine.

  As shown in this figure, when performing a tensile test on the test piece 101, the upper end of the test piece 101 is gripped by a pair of gripping teeth 31 of the upper grip and the lower end of the test piece 101 is gripped by the lower grip. A tensile test force is applied to the test piece 101 by gripping with a pair of gripping teeth 32 of the tool and moving the upper gripping tool and the lower gripping tool in a direction in which they are separated from each other.

  When the surface hardness of the film is measured, as a fixed stage for fixing the film, the contact surface with the film is made of porous ceramic, and the film is fixed by vacuum suction. A fixed stage for fixing a film has also been proposed (see Patent Document 1).

JP, 2013-88252, A

  For example, FIG. 5 shows a case where a tensile test is performed on a test piece (referred to as a water-containing test piece in the present invention) made of a material that is thin and fragile and contains water, such as a biomaterial. As described above, when the test piece 101 is gripped by the gripping teeth 31 and 32, the gripping portion of the test piece 101 by the gripping teeth 31 and 32 is damaged. When the test piece 101 is damaged in this way, the damaged portion becomes the starting point of the breakage, which causes a problem that an accurate tensile test cannot be executed. Such a problem similarly occurs in the vacuum suction area even when the film-fixing fixed stage described in Patent Document 1 is applied as a grip.

  The present invention has been made to solve the above problems, and even when performing a material test on a water-containing test piece, it is possible to suitably hold the test piece without damaging the test piece. An object is to provide a holder for a material testing machine.

The invention according to claim 1 is a holder for a material testing machine for holding the water-containing test piece when a material test is performed on the water-containing test piece, wherein both ends of a test region of the water-containing test piece are held. By a surface contact with a part , a pair of holding members having a large number of recesses into which the water of the water-containing test piece can penetrate, and placing both ends of the water-containing test piece on the pair of holding members, the pair of By holding the holding member and one surface of the water-containing test piece, while holding the water-containing test piece, by moving the pair of holding members in a direction separating from each other, the tensile test force on the water-containing test piece. Is given .

  The invention according to claim 2 is the holder for a material testing machine according to claim 1, wherein the holding member is made of a porous material.

  The invention according to claim 3 is the holder for a material testing machine according to claim 2, wherein the holding member is formed of a sponge-like member.

  According to a fourth aspect of the present invention, in the holder for a material testing machine according to the third aspect, a region of the holding member other than a region in contact with the water-containing test piece is supported by a supporting member having rigidity.

  According to a fifth aspect of the present invention, in the material testing machine holder according to any of the first to fourth aspects, the contact surface of the holding member with the water-containing test piece is curved.

  The invention according to claim 6 is the holder for a material testing machine according to any one of claims 1 to 5, wherein the holding member has a horizontal direction with the water-containing test piece placed thereon. Move to.

  According to the inventions of claims 1 to 3, the water-containing test piece is held by bringing one surface of the water-containing test piece into contact with a holding member having a large number of recesses into which water can penetrate. Therefore, the test piece can be preferably held without damaging the test piece.

  According to the invention described in claim 4, by supporting the sponge-like member with a member having rigidity, it is possible to perform a material test in a state where the shape of the holder is stable.

  According to the invention described in claim 5, by making the contact surface of the holding member with the test piece curved, the holding force in the tensile direction of the test piece is increased to more reliably hold the test piece. Is possible.

  According to the invention of claim 6, by mounting the test piece on the holding member, the test piece can be stably held.

It is a side surface schematic diagram of the material testing machine provided with the holder for materials testing machines concerning a 1st embodiment of this invention. It is a plane schematic diagram of the material testing machine provided with the material testing machine holder concerning a 1st embodiment of this invention. It is a side surface schematic diagram of the material testing machine provided with the holder for materials testing machines concerning a 2nd embodiment of this invention. It is a plane schematic diagram of a material testing machine provided with the holder for materials testing machines concerning a 2nd embodiment of this invention. It is explanatory drawing which shows a mode that a material test is performed with respect to the test piece 101 in the conventional material testing machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a material testing machine equipped with a holder for a material testing machine according to a first embodiment of the present invention, and FIG. 2 is a schematic plan view thereof.

  This material testing machine performs a tensile test as a material test on a water-containing test piece 100 made of a material containing moisture such as a biomaterial. The water-containing test piece 100 is, for example, a cell sheet or the like formed by culturing human skin cells. Although the water-containing test piece 100 is exaggerated in thickness in FIGS. 1 and 2, it is extremely thin and fragile. Note that the term "contains water" as used herein includes a substance in which water as a liquid drips when squeezed, and a substance in a wet state in which water does not drip even if squeezed. Further, the water content is a concept including not only water as a compound but also liquid one containing oil and the like.

  This material testing machine includes a pair of fixing parts 24 and 25 arranged on a base 26 that rotatably supports a pair of ball screws 15 arranged in the horizontal direction, and a pair of ball screws inside thereof. 15 and a moving portion 14 having a nut portion that is screwed into the screw portion 15. A holder for a material testing machine according to the present invention, which includes a holding member 11, a supporting member 12, and a connecting member 13, is connected to the moving unit 14. On the other hand, one of the pair of fixing portions 24, 25 has a holding portion 11, a supporting member 12, and a connecting member 13 at one of the holding portions 24 for holding the material testing machine according to the present invention. The tools are connected via the load cell 23.

  A synchronous pulley 16 is arranged at one end of each ball screw 15. A synchronous belt 18 is wound around these synchronous pulleys 16. The synchronous belt 18 is also engaged with the synchronous pulley 17 which is rotated by the drive of the motor 19 arranged on the base 26. Therefore, the pair of ball screws 15 are driven by the motor 19 to rotate in synchronization with each other. Then, the rotation of the ball screw 15 causes the moving portion 14 to move in the horizontal direction.

  The supporting member 12 and the connecting member 13 which constitute the holder for a material testing machine according to the present invention are made of metal, and the holding member 11 is made of a sponge-like member having a sheet shape. The holding member 11 is fixed on the support member 12 by adhesion with an adhesive or another method. The holding member 11 made of this sponge-like member is porous, and when it comes into surface contact with the water-containing test piece 100, the water of the water-containing test piece 100 permeates into the recess formed in the porous body and penetrates into the recess. As a result, the water-containing test piece 100 and the porous convex portion are in direct contact with each other, and friction resistance or adhesive force can be generated between the water-containing test piece 100 and the holding member 11.

  At this time, the water-containing test piece 100 and the holding member 11 are in surface contact with each other through a large number of irregularities formed on the sponge-like member. Even if a force that relatively moves in the direction parallel to the contact surface is generated, the force can be dispersed over the entire contact surface. Therefore, the hydrous test piece 100 is not damaged at the contact portion with the holding member 11.

  When a tensile test is performed on a water-containing test piece 100 such as a biomaterial in a material testing machine equipped with a holder for a material testing machine having the above-described configuration, as shown in FIGS. The piece 100 is placed on the holding member 11. At this time, the water contained in the water-containing test piece 100 penetrates into the concave portion of the holding member 11 made of a sponge-like member, so that the water-containing test piece 100 and the porous convex portion directly. When they come into contact with each other, frictional resistance or adhesive force is generated between the water-containing test piece 100 and the holding member 11. In this state, the motor 19 is driven to move the moving portion 14 in a direction away from the one fixed portion 24, thereby applying a tensile test force to the hydrous test piece 100. The test force at this time is measured by the load cell 23.

  Next, another embodiment of the present invention will be described. FIG. 3 is a schematic side view of a material testing machine equipped with a holder for a material testing machine according to a second embodiment of the present invention, and FIG. 4 is a schematic plan view thereof. The same members as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

  In the material testing machine holder according to the first embodiment described above, the upper surface of the holding member 11 and the upper surface of the support member 12 are flat, and the contact area between the holding member 11 and the hydrous test piece 100 is also the same. It was flat. On the other hand, in the second embodiment, the support member 22 has a cylindrical shape that faces the direction orthogonal to the moving direction of the moving unit 14, and the upper surface of the support member 22 is curved. As a result, the upper surface of the holding member 21 supported by the supporting member 22 also has a curved surface shape along the upper surface of the supporting member 22. The holding member 21 is also made of a sheet-shaped porous sponge-like member, like the holding member 11 according to the first embodiment.

  In the material testing machine equipped with the holder for a material testing machine according to the second embodiment, when the tensile test is performed on the water-containing test piece 100, the water-containing test piece 100 is held as shown in FIGS. 3 and 4. It is placed on the member 21. As a result, the water contained in the water-containing test piece 100 infiltrates into the concave portion of the holding member 21 composed of the sponge-like member, so that the water-containing test piece 100 and the convex portion formed into a porous structure directly. When they come into contact with each other, frictional resistance or adhesive force is generated between the water-containing test piece 100 and the holding member 21.

  At this time, in the holder for a material testing machine according to the second embodiment, since the upper surface of the holding member 21 is curved, the contact area of the water-containing test piece 100 with the holding member 21 is also curved. Becomes This makes it possible to increase the holding force of the water-containing test piece 100 in the pulling direction as compared with the case where the water-containing test piece 100 is flat, and to hold the water-containing test piece 100 more reliably. Become.

  In each of the above-described embodiments, a sponge-like member is used as the holding members 11 and 21. However, the holding members 11 and 21 are not limited to the sponge-like members, and other porous materials such as ceramics may be used. Further, the holding member is not limited to the porous material, and other holding members having a large number of recesses, into which water of the water-containing test piece 100 can enter by making surface contact with the water-containing test piece 100, may be used.

  In addition, in the above-described embodiment, the holding members 11 and 21 formed of a soft sponge-like member are supported by the support members 12 and 22 to stabilize the shape of the holder. However, when ceramic or porous metal is used as the holding member and the holding member itself has rigidity, the above-mentioned support member 12 may be omitted.

  Further, in the above-described embodiment, the water-containing test piece 100 is placed on the pair of holding members 11 and 21 in a horizontal direction, and a test force that is directed in the horizontal direction is applied to the water-containing test piece 100. There is. However, since the water content of the water-containing test piece 100 penetrates into the holding members 11 and 21, the water-containing test piece 100 is held by the holding members 11 and 21 even when the surface of the water-containing test piece 100 is arranged in the vertical direction. When obtaining, the water-containing test piece 100 may be arranged with the vertical direction facing, and a tensile test may be performed by applying a test force directed in the vertical direction.

  Further, in the above-described embodiment, the water-containing test piece 100 has a flat shape, but the water-containing test piece 100 is not limited to such a shape. For example, when performing a tensile test on a string-shaped test piece or a tubular test piece containing water, the holder for a material testing machine according to the present invention may be used.

11 holding member 12 support member 13 connecting member 14 moving part 15 ball screw 19 motor 21 holding member 22 support member 23 load cell 24 fixing part 25 fixing part 100 water-containing test piece

Claims (6)

When performing a material test on a water-containing test piece, a holder for a material testing machine for holding the water-containing test piece,
By a surface contact with both ends of the test area of the water-containing test piece, a pair of holding members having a large number of recesses into which the water of the water-containing test piece can enter,
Both ends of the water-containing test piece are placed on the pair of holding members, and by holding the pair of holding members and one surface of the water-containing test piece, the water-containing test piece is held and the pair of holding members is held. A holder for a material testing machine, characterized in that a tensile test force is applied to the water-containing test piece by moving the members in directions away from each other . The holder for a material testing machine according to claim 1,
The holding member is a holder for a material testing machine, which is made of a porous material. The holder for a material testing machine according to claim 2,
The holder for a material testing machine, wherein the holding member is a sponge-like member. The holder for a material testing machine according to claim 3,
A holder for a material testing machine, wherein a region other than a region in contact with the hydrous test piece of the holding member is supported by a supporting member having rigidity. The material testing machine holder according to any one of claims 1 to 4,
A holder for a material testing machine, wherein a contact surface of the holding member with the water-containing test piece is curved. The material testing machine holder according to any one of claims 1 to 5,
The said holding member is a holder for material testing machines which moves horizontally with the said water-containing test piece mounted on the upper part.

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