A method for studying the strength characteristics of structural materials in a biaxial stress state

Abstract

The article discusses the issue of ensuring the strength of the material of highly loaded structural elements by modeling the stress-strain state (SSS) of the material of these elements on special laboratory samples for mechanical tests in order to assess the structural strength of these structural elements. Biaxial stress-strain state, which usually arises in this case, is characterized by a different ratio of the principal stresses in the source of possible destruction, which affects the strength characteristics of the material and requires technical equipment when determining the strength of the material in laboratory conditions. The creation of a biaxial stress-strain state under these conditions is a complex technical problem, since it requires the use of non-standard laboratory samples and test systems with several power drives or complex lever devices for loading these samples, which limits the use of this test method in determining the mechanical properties of materials. The article proposes a relatively simple method for testing materials with complex stress-strain state based on the use of special disk laboratory samples tested on standard test equipment with one power drive. A description of the design of the disk sample, the method of its deformation and the implementation of test conditions is given.