Metal tension and torsion combine deformation mechanics and sound emission characteristic testing and analyzing method

Abstract

The invention relates to a metal tension and torsion combine deformation mechanics and sound emission characteristic testing and analyzing method. The method comprises the steps of designing a testingsystem, explaining signal characteristics needing to be extracted, performing the calculation derivation process on breaking stress of different material test pieces and breaking surface direction hereof under the tension-torsion effects, and determining the material breaking type and the breaking stress. A tension and torsion electron tester system loads and collects axial force, torque, axial deformation, torsion angles and other mechanical signals of test pieces, and sound emission signals are collected through a sound emission instrument and an acoustic sensor; on the basis of the material mechanics theory, the calculation formula of the tension and torsion combined breaking stress and the direction thereof is derived; by means of the collected signals and the characteristic distinguishing breaking types, the breaking stress and the breaking surface direction of the test pieces are calculated. By means of the system, the tension-torsion combined breaking mechanics, sound emissioncharacteristics, breaking types, breaking stress and the breaking surface of different metal materials under different loading rates can be obtained and compared.

Description

technical field [0001] The invention relates to a method for testing and analyzing metal tensile and torsion combined deformation mechanics and acoustic emission characteristics, belonging to the field of material mechanical performance testing. Background technique [0002] Yielding and fracture are two basic forms of failure in engineering materials. Metal is a common engineering material. In practical engineering applications, metal components often suffer from basic deformations such as tension and compression, shear extrusion, torsion, bending, and various combined deformations, and the failure modes of components under different combined deformations different from each other. Tensile-torsional combined deformation is very common in engineering, but the elastic deformation energy stored inside the component is different under different tensile and torsional load ratios and different loading speeds. The deformation energy, acoustic emission phenomenon, stress during f...

AI Technical Summary

Problems solved by technology

Tensile-torsional combined deformation is very common in engineering, but the elastic deformation energy stored inside the component is different under different tensile and torsional load ratios and different loading speeds. The deformation energy, acoustic emission phenomenon, stress during failure, and location of the failure surface are all different, especially under the combination of tension and torsion, the load ratio of tension and torque, and the loading rate of tension and torsion have a great influence on the mechanical characteristics and acoustic characteristics. The influence of the emission characteristic law and the influence on the failure stress and failure surface have not been reported in detail so far.

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