Test device for determining the tensile strength of quasi-brittle materials by the bilinear splitting method

Abstract

The invention discloses a test device for measuring the tensile strength of quasi-brittle materials by a bilinear splitting method, comprising two hump loading heads arranged on the upper and lower sides of a rectangular test piece for applying loads to the rectangular test piece; The invented test device for measuring the tensile strength of quasi-brittle materials by the bilinear splitting method can avoid the test deviation caused by the traditional splitting method due to the machining accuracy of cylindrical or disc specimens, and can obtain stable tensile stress, which can be accurately obtained. The ultimate tensile strength of the specimen improves the test accuracy of the splitting strength test.

Description

technical field [0001] The invention discloses a test device, in particular to a test device for testing the tensile strength of quasi-brittle materials such as concrete or rocks. Background technique [0002] The tensile strength of quasi-brittle materials such as concrete and rocks can be determined by test methods, including direct tension method and split method (including cylinder split method and Brazilian disc method). When the specimen is subjected to a pair of splitting concentrated loads, uniform tensile stress is generated in the direction perpendicular to the loading direction according to the principle of elastic mechanics, and the corresponding load when the member is split into two halves can be converted into the tensile strength of the material; directly Due to the centering deviation problem of the tensile method, the measured data are very discrete, and the true tensile stress in the component cannot be accurately obtained; Or the manufacturing precision ...

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Problems solved by technology

When the specimen is subjected to a pair of splitting concentrated loads, uniform tensile stress is generated in the direction perpendicular to the loading direction according to the principle of elastic mechanics, and the corresponding load when the member is split into two halves can be converted into the tensile strength of the material; directly Due to the centering deviation problem of the tensile method, the measured data are very discrete, and the true tensile stress in the component cannot be accurately obtained; Or the production accuracy and local stress of the disc may cause the loading point to crack first, resulting in the phenomenon that the test result does not match the theoretical value, which has a great influence on the test result

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