Method for establishing crystal plastic constitutive model in face-centered cubic material fatigue process

Abstract

The invention discloses a method for establishing a crystal plastic constitutive model in a face-centered cubic material fatigue process. According to the method, the problem that mesoscopic scale plastic evolution and material microstructure characteristics cannot be considered in the process of calculating material damage and fatigue failure is solved, and a more accurate and innovative mesoscopic crystal modeling method, a crystal plastic constitutive model and related stable and efficient calculation methods are provided. According to the crystal plastic constitutive model and the calculation method, the normal direction and the sliding direction of the crystal sliding face are considered, the back stress effect is considered through the motion and isotropic hardening criterion, and finally the face-centered cubic metal material crystal plastic constitutive model of the crystal sliding and dislocation density and plastic shear strain rate function relation is established. The influence effect and contribution degree of the microscopic characteristics of the material on the damage and fatigue life of the material can be studied from the mesoscopic scale, important theoretical guidance and technical support are provided for studying the damage evolution and fatigue failure process of the material, and the method has important scientific significance and engineering application value.

Description

technical field [0001] The invention relates to the technical field of material fatigue failure, in particular to a method for establishing a crystal plastic constitutive model in the fatigue process of a face-centered cubic material. Background technique [0002] Reliability and long life are the core issues in the service process of materials. Research has shown that fatigue is one of the leading causes of failure in mechanical components and industrial equipment. Statistical analysis shows that more than 80% of mechanical failures are caused by fatigue. Fatigue failure is latent and sudden, and it will also have a certain impact on adjacent components. Therefore, fatigue failure is a very complex physical phenomenon of material-mechanical interaction. Usually, the failure of materials starts from the grain or grain boundary, and after a period of plastic deformation, visible microscopic cracks are formed on the slip zone. A large number of microscopic cracks fuse with ...

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for establishing a crystal plastic constitutive model in the fatigue process of face-centered cubic materials, which solves the problem that mesoscopic plastic evolution and material microstructure characteristics cannot be considered in the calculation of material damage and fatigue failure. question question

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