JPH0843283A - Jig for evaluating and testing shearing strength - Google Patents

Abstract

PURPOSE:To provide a jig for evaluating and testing shearing force consisting of a body, a collar, and a ball, to suppress the sliding frictional resistance of a shearing section and to prevent the generation of a lateral deviation and the influence of bending to be applied to a test piece at the time of evaluating the shearing strength with the connecting boundary of connecting materials as the shearing section. CONSTITUTION:Two split bodies 2 sliding on the sliding surface 3 of a testpiece mounting hole 1 are superposed, and a collar 4 is attacked to them. A ball 5 is inserted in a guide groove 8 for positioning the ball 5 of the collar 4 as to able to keep a suitable gap between the collar 4, the ball 5 and the body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a jig that enables a shear strength evaluation test to be performed on a shear surface (mainly a bonding interface) 7 of a test piece (mainly a bonding material) 6 without causing bending deformation. It is about. The strength evaluation test methods for joining materials are roughly divided into bending tests and shear tests. The shear test is excellent in that it does not require processing of the joining material into a test piece and is simple, but since the effect of bending on the test piece cannot be eliminated during the test, it has been used for absolute evaluation of shear strength. It has been said to have a problem. This jig can eliminate the effect of bending on the test piece during the shear test, and enables evaluation of shear strength close to absolute evaluation. In addition, conventional jigs generate large frictional force as compared with shear strength, making it difficult to carry out highly accurate shear strength evaluation tests. The jig according to the present invention eliminates the above-mentioned influence of bending and at the same time reduces the generated frictional force, thereby making it possible to carry out a highly accurate shear strength evaluation test. With this jig, it becomes possible to acquire shear strength data necessary for designing the strength of a structure in which a large number of joints such as an energy conversion type functionally graded material coexist. In addition, as described in the examples, by manufacturing this jig with a heat-resistant material,
A shear strength evaluation test at high temperature can be performed.

[0002]

2. Description of the Related Art In a conventional shear strength evaluation test, as shown in FIG. 4, the jig body 9 is loaded in a load direction by a bolt 10 or a wire to remove the influence of bending on the test piece at the time of the test. (Direction indicated by arrow in FIG. 4)
It was restrained so that no deviation occurred in the direction perpendicular to. However, in such a restraining method, a large frictional force is generated between the sliding surfaces during the shear test due to the force that acts vertically on the sliding surface 12 due to the restraint. Since the shear strength of the joint interface of ordinary joint materials is extremely low, accurate shear strength evaluation becomes difficult if a large frictional force is generated in the sliding movement of the jig (the direction indicated by the arrow in FIG. 4). Therefore, the conventional method is
Although the effect of bending on the test piece 11 could be removed to some extent, the large frictional force generated was a problem in terms of accuracy in measuring the shear load.

[0003]

As described above, in carrying out the conventional shear strength test, the effect of bending or the effect of sliding friction on the test piece cannot be avoided. High shear strength evaluation was impossible. Therefore, there is a demand for a method capable of simultaneously removing the effects of bending and sliding friction in the shear test, and the present invention is intended to solve this problem.

[0004]

[Means for Solving the Problems] The structure of the jig for shear strength evaluation test will be described. Stack the main body 2 of the
Is attached. (B) Insert the ball 5 into the guide groove 8 for positioning the ball 5 on the collar 4 so that the gap between the collar 4, the ball 5 and the main body portion 2 can be properly taken. (C) The collar 4 and the ball 5 can prevent the lateral displacement and the influence of bending on the test piece 6. (D) By providing an appropriate gap between the main body 2, the collar 4 and the balls 5, the frictional resistance against the sliding of the jig during the shear test is reduced. (E) As a result, the shear strength evaluation test can be performed without the bending of the shear surface 7 of the test piece 6. The apparatus is operated as described above.

[0005]

The present invention is intended to simultaneously solve the influence of the bending force on the test piece and the frictional force between the sliding surfaces of the jig, which is a problem when performing the shear strength test. By appropriately setting the gap between the collar 4 and the ball 5, the test piece 6 is not affected by bending and the main body 2
Enables sliding movement along the shear surface (in the direction of the arrow in Fig. 3), and a highly accurate shear strength evaluation test can be performed.
Further, since the collar 4 and the main body 2 that play a role of suppressing the influence of bending on the test piece 6 are in contact with each other through the ball 5, they act vertically in the sliding direction (arrow direction in FIG. 3). The force that causes the frictional force can be reduced to about one-third that of the conventional jig. Therefore, by using the jig for shear strength evaluation test of the present invention, an accurate shear strength test can be carried out under the condition that there is no influence of bending and sliding friction.

[0006]

EXAMPLES The method of carrying out the present invention will be described with reference to experimental results.

First Example As shown in FIG. 5, a shear strength evaluation test jig 14 of the present invention was mounted inside an electric furnace 13 for heating of an electronic universal tensile compression tester. In this case, the main body 2 and the collar 4
Are made of Inconel alloy, and the balls 5 are made of alumina ceramics. Then, from room temperature to 100 at the bonding interface of the bonding material of stainless steel and alumina ceramics.
A shear strength evaluation test up to 0 ° C (1273K) was performed. The relationship between the shear strength τ _s , which is the test result, and the test temperature is shown in FIG. The shear strength τ _s is given by the following equation. τ _s = P / A where P is the shear fracture load, and A is the shear area of the test piece (cross-sectional area of the bonding interface).

Second Example As shown in FIG. 7, the shear strength evaluation test jig 16 of the present invention was mounted in the heating electric furnace 15 of the single type creep rupture tester. Also in this case, the main body 2 and the collar 4 are made of Inconel alloy, and the balls are made of alumina ceramics. Then, 60% of the joining interface of the joining material of stainless steel and alumina ceramics
Shear creep strength evaluation tests were performed at 0 ° C (873K) and 700 ° C (973K). FIG. 8 shows the relationship between the shear stress τ which is the test result and the breaking time. Shear stress τ is given by the following equation. τ = P / A where P is the shear load and A is the shear area of the test piece (cross-sectional area of the bonding interface).

[0009]

As described above, by using the jig for shear strength evaluation test of the present invention, accurate shear strength evaluation can be performed with the bonding interface of the bonding material as a main object without influence of bending and sliding friction. Becomes

[Brief description of drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a side view of the present invention.

FIG. 3 is a sectional view of the present invention (a sectional view taken along the line AA in FIG. 2).

FIG. 4 is a sectional view of a conventional jig for shear strength evaluation test.

FIG. 5 is an example in which the present invention is used in a high temperature shear strength test.

FIG. 6 is a result of high temperature shear strength test of the above example.

FIG. 7 is an example in which the present invention is used in a high temperature shear creep strength test.

FIG. 8: High temperature shear creep strength test result of the above example

[Explanation of symbols]

 1 is a test piece mounting hole 2 is a main body of a jig for shear strength evaluation test 3 is a sliding surface 4 is a collar 5 is a ball 6 is a test piece (mainly a bonding material) 7 is a shearing surface (a bonding interface at a bonding material) (Match) 8 is a guide groove 9 is a body of a conventional jig for shear strength evaluation test 10 is a bolt and nut for preventing bending and lateral displacement 11 is a test piece (mainly a bonding material) 12 is a sliding surface 13 is a heating Electric furnace 14 is a jig for shear strength evaluation test 15 is an electric furnace for heating 16 is jig for shear strength evaluation test

Claims (2)

[Claims] 1. A collar 4 for suppressing frictional resistance against sliding of a sliding surface 3 of a two-part type main body 2 having a test piece mounting hole 1 and preventing lateral displacement and bending. And jig for shear strength evaluation consisting of pole 5 2. A jig for shear strength evaluation test according to claim 1, which enables highly accurate shear strength evaluation test to be carried out without the bending of the shear surface 7 of the test piece 6.