Fragile material tension and torsion test method and test auxiliary device

Abstract

The invention discloses an auxiliary device and a method of fragile material tension and torsion test. The auxiliary device comprises a clamping protective sleeve and a protective sleeve centering device. The clamping protective sleeve is a cylindrical sleeve. the protective sleeve centering device comprises a support frame, an upper centering block, a threaded rod and a handle. The support frame comprises a pedestal and a column erected on the pedestal. A threaded hole penetrating the upper centering block is disposed on the upper centering block; the threaded rod passes through the threaded hole on the upper centering block, and also passes through a threaded hole on the column of the support frame. The handle is mounted at the upper end part of the threaded rod. A V-shaped long groove is disposed on the upper surface of the pedestal of the support frame and extends across the upper surface of the pedestal, and a V-shaped long groove is disposed at a corresponding position on the lower surface of the upper centering block. The auxiliary device and the test method effectively prevent a tension and torsion sample made of a fragile material from directly contacting antiskid teeth of a chuck of a testing machine, and thus prevent the sample from being crushed by the antiskid teeth. The device is simple in structure; the test method is easy to perform; no additional reconstruction of the testing machine is needed; and the cost is low.

Description

technical field [0001] The invention belongs to the field of material mechanics testing, and mainly relates to a material testing method and a testing auxiliary device, in particular to a brittle material tensile and torsion testing method and a testing auxiliary device. Background technique [0002] Brittle materials such as ceramic materials, concrete, glass and rocks have been widely used in national economy and national defense projects. In order to ensure the reliability of brittle materials in use, it is necessary to fully grasp the mechanical properties of the corresponding materials under complex loads. In order to meet the design requirements of today's products, it is far from enough to study the properties of materials under uniaxial stress states. More complex stress state tests must be carried out to study the mechanical properties of materials under multiaxial stress states. The diaxial stress state is the simplest form of the multiaxial stress state and is re...

AI Technical Summary

Problems solved by technology

However, due to the poor toughness of brittle materials and the effect of the inverted triangular anti-slip teeth on the clamping surface of the testing machine chuck, if the brittle material is directly clamped to the chuck of the testing machine, the brittle material will be directly clamped, resulting in failure of the test. conduct

Therefore, it is very difficult to directly perform tensile and torsion tests on brittle materials.

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