Tension torsion steady-state cyclic stress-strain modeling method based on basic mechanics parameters

Abstract

The invention provides a tension torsion steady-state cyclic stress-strain modeling method based on basic mechanics parameters. The tension torsion steady-state cyclic stress-strain modeling method based on the basic mechanics parameters comprises the following steps of: step (1). obtaining the basic mechanics parameters of a material; step (2). calculating relevant material parameters by using the basic mechanics parameters; step (3). dispersing load steps, and calculating the stress tensor by using the Hooke's law; step (4). using the yield criterion to judge whether the stress state in step(3) is in the elastic loading stage, if yes, performing the next calculation according to step (6), otherwise, performing the next calculation according to step (5); step (5). calculating an additional strengthening coefficient, a non-proportional band factor, a plastic modulus, plastic strain tensor, bias stress tensor and back stress tensor; and step (6). judging whether the loading is completed, if yes, obtaining the multi-axis steady-state cyclic stress-strain, and otherwise, repeating steps (3) to (6). The tension torsion steady-state cyclic stress-strain modeling method based on the basic mechanics parameters avoids the complicated multi-axial fatigue test, and considers the non-proportional additional strengthening effect of the material, and is convenient for engineering application.

Description

technical field [0001] The invention belongs to the technical field of machinery, and further relates to a modeling method of tension-torsion steady-state cyclic stress and strain based on basic mechanical parameters in the technical field of mechanical fatigue strength. The invention can be used to model the cyclic stress and strain in the tension-torsion steady state, and the modeling results can be used for fatigue life prediction, safety performance evaluation and the like of engineering structures. Background technique [0002] In engineering practice, most machinery and engineering structures work under complex multiaxial stress states. Therefore, multiaxial fatigue failure is a common failure form of mechanical and structural parts, accounting for about 50% to 90% of mechanical failures. Since multiaxial fatigue failure usually has no obvious macroscopic plastic deformation, sudden fracture often occurs, causing great harm and economic loss. Compared with uniaxial fa...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a tensile-torsion steady-state cyclic stress-strain modeling method based on basic mechanical parameters, which is used to solve the need to pass through complicated methods when calculating the steady-state cyclic stress and strain of materials in the prior art. Problems of Determining Model Parameters in Fatigue Test

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