JPH0552726A - Device for testing in-plane shearing rigidity - Google Patents

Abstract

PURPOSE:To obtain a device for testing in-plane shearing rigidity wherein required number of testing jigs and test pieces is small and a bonding agent for preventing sliding between both parts are not required and which has excellent economic property and efficiency. CONSTITUTION:In a device for testing in-plane shearing rigidity forces are selectively applied in a plurality of directions through a plurality of jigs, which are linked to a plurality of bolt holes with the appropriate number of bolts. The bolt holes are appropriately provided in a flat-plate shaped test piece so as to penetrate the test piece. The strain of the test piece at this time is measured with a strain gage 08 which is provided and attached to the test piece 1. A plurality of the bolt holes are arranged along the outer surface of the test piece 1 at an appropriate pitch. Each bolt hole is selected, and a plurality of compressing jigs 4 are compressed to the test piece 1 through the bolts 04. One end of each of a pair of tester coupling jigs 5 is linked to each compressing jig 4 through the bolt 04. An antislipping irregularity 6 is formed on the compressing surface of the compressing jig 4.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an in-plane shear stiffness tester.

[0002]

2. Description of the Related Art When designing a structure, it is necessary to know the rigidity of a plate-shaped material in shear deformation, and therefore, conventionally, for example, as shown in the plan view of FIG.
An in-plane shear rigidity test is performed by adding the tensile force P to 1 and measuring the magnitude of the force and the amount of deformation. By the way, as an apparatus for this purpose, as shown in the front view and the side view of FIG. 9, a rectangular flat plate-shaped test piece 03 having a plurality of bolt holes 02 penetrating vertically and horizontally is conventionally shown in the front view of FIG. Is fixed to the test jig 05 via a plurality of bolts 04, and the upper and lower ends of the test jig 05 are fixed by the tester fitting portions 06 and 07, and pulled or compressed respectively in the upward and downward directions, Test piece 0
It is known that the strain gauge 08 attached to the central part of 3 measures the strain generated in the test piece 03 and is set by the American Society for Testing Materials. Further, as shown in the front view of FIG. 11, a flat plate-shaped test piece 09 having a plurality of bolt holes 02 penetrating vertically and horizontally is shown in FIG.
2 As shown in the front view, the left and right parts of the test piece 09 are fixed to the test jig 010 via a plurality of bolts 04, and the left and right parts of the test piece 09 are pedestal 011.
Respectively, and press the central part downward with the tester fitting part 06, and the strain at that time is measured by the strain gauge 0 attached to the central part of the test piece 09.
A device set by the same as above, which measures at 8, is also known.

However, these devices have the following drawbacks when testing anisotropic materials such as composite materials. (1) In the apparatus shown in FIG. 10, in order to apply the force to the test piece 03 in the desired direction by the tester fitting portions 06 and 07, the test jigs 05 matched in the respective directions are required. In addition, the material cost and the attachment / detachment work cost are high, which is uneconomical. (2) In the device shown in FIG. 12, in order to apply a force to the test piece 03 in each desired direction by the tester fitting portion 06, the test piece in which the corresponding bolt holes 02 are provided in each direction is provided. Since 09 is required, the material cost and the attachment / detachment work cost are high, which is uneconomical. (3) In the devices of (1) and (2) above, in order to apply a force evenly to the test piece, apply an adhesive between the test jig and the test piece so that slippage does not occur between them. As a result, its application and removal costs are high and therefore inefficient.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and requires a small number of test jigs and test pieces, and an adhesive for preventing slippage between the two. It is an object of the present invention to provide an in-plane shear stiffness testing device that is unnecessary and is therefore economical and efficient.

[0005]

To this end, the present invention is directed to a plurality of different directions through a plurality of jigs connected to a plurality of bolt holes appropriately formed in a flat plate-shaped test piece by a suitable number of bolts. Selective force is applied to, in the in-plane shear stiffness tester to measure the strain of the test piece at that time with a strain gauge attached to the test piece, a plurality of pieces arranged at an appropriate pitch along the outer circumference of the test piece Bolt holes, a plurality of pressure welding jigs that are pressed against the test piece through bolts by selecting the bolt holes, and one end of each of the pressure welding jigs is connected through a bolt. It is characterized by having a pair of tester fitting jigs.

[0006]

According to this structure, the following actions are performed. (1) Selectively applying a force in a plurality of different directions through a plurality of jigs connected to a plurality of bolt holes appropriately penetrating a flat plate-shaped test piece with a proper number of bolts, and Since the strain of the test piece is measured by the strain gauge attached to the test piece, the in-plane shear rigidity test of the anisotropic material becomes possible. (2) Since a plurality of bolt holes arranged at appropriate pitches are provided along the outer circumference of the test piece, it is possible to perform a plurality of in-plane shear stiffness tests in different directions with one test piece. (3) A plurality of pressure welding jigs which are selected from the above bolt holes and are pressure-welded to the test piece via bolts, and a pair of pressure welding jigs each having one end connected to each of the pressure welding jigs via a bolt. Since a tester fitting jig is provided, one set or a small number of sets of pressure welding jigs can be used for in-plane shear stiffness tests in different directions. Is reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. The same reference numerals as those in FIGS. 8 to 12 denote the same members, respectively. First, in FIGS. A plate-shaped test piece in which bolt holes 2 are formed at regular intervals of 30 ° at the peripheral edge, 3 is a strain gauge mounting position set in the center of the test piece 1, and 4 are four rectangular pressure contact pieces. Is a square frame-shaped jig for pressing test pieces, each of which has a bolt hole 2 of the test piece 1.
Both ends are bolts 0 at equal intervals with a central angle of 90 °.
It is fixed through 4. Reference numeral 5 is a pair of upper and lower tester fitting jigs, and the opposite ends thereof are pivotally attached to the upper end bolt and the lower end bolt of the bolts 04 for fixing the pressure welding jig 4 to the test piece 1. Next, in the partial perspective view of FIG. 3, reference numeral 6 is a corrugated anti-slip unevenness formed on the pressure-contacting surface of the pressure-bonding jig 4 with the test piece 1. Furthermore, the front view of FIG.
2 shows how to use the apparatus, and FIGS. 2A, 2B, and 2C show the states in which they are used in different directions of 30 °, 60 °, and 90 ° with respect to the state of FIG. 2, respectively.

In such an apparatus, in order to test the in-plane shear rigidity, as shown in FIGS. 2 to 4, a bolt 04 and a bolt hole 2 whose direction is selected are used on the peripheral portion of the test piece 1. The four pressing jigs 4 are pressed into a square frame shape, and the fitting jigs 5 are pivotally attached to the bolts 04 of the pair of bolt holes 2 whose directions are selected. Each of the opposite ends is attached to the tester, the tester 1 is pulled in the selected direction by the tester, the indication of the strain gauge 08 is read, and thereafter, the same operation is repeated for each different direction. Next, FIG. 5 and FIG.
The front view shows a modified example of FIG. 2, and 7 is a square flat plate having test pieces in which bolt holes 8 are provided at respective positions of the peripheral edge portions in which the orientations of 0 °, 30 °, 60 ° and 90 ° can be taken. Reference numeral 9 is a strain gauge mounting position set at the center of the test piece 7, and 10 is a plurality of jigs for press-contacting the test piece. Even in such a structure,
The operation and effect thereof are substantially the same as those of FIG. 2, but as can be seen from the front views of FIGS. 6 and 7, two sets having different lengths for the directions 0 ° and 90 ° and the directions 30 ° and 60 ° are used. The pressure welding jig 10 is required.

According to the apparatus of these embodiments and modifications,
The following effects are exhibited. (1) A force is selectively applied to a plurality of different directions through a plurality of jigs connected by a proper number of bolts to a plurality of bolt holes appropriately penetrating the flat plate-shaped test piece, and the above Since the strain of the test piece is measured by the strain gauge attached to the test piece, the in-plane shear rigidity test of the anisotropic material becomes possible, and therefore the physical properties of the composite material can be surely grasped. (2) Since a plurality of bolt holes arranged at an appropriate pitch along the outer circumference of the test piece are provided, it is possible to perform a plurality of in-plane shear rigidity tests in different directions with one test piece, and Material costs are reduced and economic efficiency is improved. (3) A plurality of pressure welding jigs that are selected from the above bolt holes and are pressure-welded to the test piece via bolts, and a pair of pressure welding jigs whose one end is connected to each of the pressure welding jigs via bolts. Since a tester fitting jig is provided, one set or a small number of sets of pressure welding jigs can be used for in-plane shear stiffness tests in different directions. Is reduced, and therefore economic efficiency is improved. (4) Since the unevenness for non-slip formed on the pressure contact surface of the pressure contact jig is provided, the degree of pressure contact between the test piece and the pressure contact jig is increased, and therefore the test piece and the pressure contact surface are used. The work of applying or removing the adhesive between the jig and the jig is not necessary, thus improving the economical efficiency.

[0010]

In summary, according to the present invention, it is possible to selectively move in a plurality of different directions through a plurality of jigs connected to a plurality of bolt holes appropriately penetrating a flat plate-shaped test piece with a proper number of bolts. In the in-plane shear stiffness tester to measure the strain of the test piece at that time with a strain gauge attached to the test piece, a plurality of bolt holes arranged at an appropriate pitch along the outer circumference of the test piece And a plurality of press-connecting jigs that are selected from the bolt holes and press-contacted to the test piece through the bolts, and a pair of tests in which one end is connected to each press-connecting jig through the bolts. Since it is equipped with a machine fitting jig, the number of test jigs and test pieces is small, and no adhesive is required to prevent slippage between the two, thus providing economical and efficient in-plane shearing. The present invention is extremely useful in the industry because a rigidity test apparatus is obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a test piece of one example of the present invention.

FIG. 2 is a front view showing a state where the test piece of FIG. 1 is mounted on a tester at a direction angle of 0 °.

FIG. 3 is a perspective view showing a pressure contact surface of the pressure contact jig of FIG. 2 with a test piece.

FIG. 4 is a front view showing a state in which force is applied to the test piece of FIG. 2 by a tester, and the direction angles of force in the figures (A), (B), and (C) are 30 °, 60 °, and It is 90 °.

FIG. 5 is a front view of the modification of FIG.

6 is a front view showing the state where the test piece of FIG. 5 is mounted on the tester at a direction angle of 0 °.

FIG. 7 is a front view showing a state in which force is applied to the test piece of FIG. 5 by a tester, and the direction angles of force in FIGS. (A), (B), and (C) are 30 °, 60 °, and It is 90 °.

FIG. 8 is a plan view showing a known in-plane shear rigidity test procedure.

FIG. 9 is a front view and a side view showing a known in-plane shear stiffness test piece.

10 is a front view showing a state where the test piece of FIG. 9 is mounted on a tester.

FIG. 11 is a front view showing a known in-plane shear stiffness test piece different from FIG. 9.

12 is a front view of the test piece of FIG. 11 mounted on a tester.

[Explanation of symbols]

 1 Test piece 2 Bolt hole 3 Strain gauge mounting position 4 Pressure welding jig 5 Fitting jig 6 Unevenness for slippage 7 Test piece 8 Bolt hole 9 Strain gauge mounting position 10 Pressure welding jig 04 Bolt 06 Tester fitting part 07 Testing machine fitting part 08 Strain gauge

Claims (1)

[Claims] 1. A force is selectively applied in a plurality of different directions through a plurality of jigs connected to a plurality of bolt holes appropriately formed in a flat plate-shaped test piece by a suitable number of bolts, at that time. In the in-plane shear stiffness tester to measure the strain of the test piece with a strain gauge attached to the test piece, a plurality of bolt holes arranged at an appropriate pitch along the outer circumference of the test piece, and each of the bolt holes. A plurality of pressure welding jigs which are selected and pressure-welded to the test piece via bolts, and a pair of tester fitting jigs whose one ends are respectively connected to the pressure welding jigs via bolts are provided. An in-plane shear stiffness testing device characterized by being provided.