Single-shaft tensile overall true stress-true strain curve testing technique

Abstract

The invention discloses a single-shaft tensile overall true stress-true strain curve testing technique. According to the technique, a single-shaft tensile test is performed on a round rod sample, and an equivalent true stress-true strain curve which can really reflect the tensile overall deformation characteristics of a material can be solved through finite element simulation iteration. The testing technique disclosed by the invention can realize the overall equivalent true stress-true strain curve of the single-shaft tensile until fracture of the material, can be used for the deformation analysis of a large structure and the fracture mechanics analysis of a component comprising cracks and has important engineering values for promoting the theory development of mechanics, the optimization design of an engineering structure and the material performance evaluation.

Description

technical field [0001] The invention belongs to the testing technology of material mechanical properties, especially the technical field of test data analysis and processing. Background technique [0002] Uniaxial tensile test is a widely used method for testing the mechanical properties of materials. It can measure important basic mechanical properties parameters such as elastic modulus, strength, and plastic hardening of materials. It is the most basic reference for engineering component design and material selection. Usually, the load-displacement curve of the material can be obtained first from the uniaxial tensile test, and then according to the original size of the sample (original cross-sectional area A 0 and the original gauge length L 0 ) to obtain the engineering stress-engineering strain curve. However, the real cross-sectional area A and gauge length L of the sample are constantly changing during the test, so the engineering stress-engineering strain curve cann...

AI Technical Summary

Problems solved by technology

Although the technical scheme can obtain the true stress-true strain curve including the necking stage through the minimum cross-sectional diameter d of the sample, it is unreasonable to assume that the strain on the smallest cross-section in the necking stage is uniformly distributed. , the "true stress-true strain curve" obtained by this technical scheme cannot truly reflect the deformation characteristics of the whole stretching process, especially the load and displacement, the minimum cross-sectional diameter and displacement, etc.

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