Method for evaluating damage and fatigue life of microscopic-macroscopic scale sheet metal forming process model

Abstract

The invention discloses a method for evaluating damage and fatigue life of a microscopic-macroscopic scale sheet metal forming process model. According to the method of the invention, a microscopic plastic constitutive model is established and macro geometry is coupled; furthermore sheet metal forming process simulation is performed; based on sheet metal forming process simulation, a microscopic-macroscopic coupling fatigue damage model is established for performing fatigue life simulation; a sheet metal forming process and a fatigue failure mechanism are researched, thereby supplying theoretical guidance and technology optimization basis for engineering application. Sheet metal forming process material performance and plastic deformation evolution distribution are researched in a microscopic aspect. Influence and contribution degree of microscopic characteristics such as crystal grain size and orientation distribution and precipitated phase distribution to the sheet metal forming process are researched. Furthermore the macroscopic model and process researching fatigue damage are coupled, and the component fatigue life is evaluated. The invention provides the reliable high-efficiency calculating model and the evaluating method. Establishment of the related model and the algorithm has important science innovation and high engineering application value.

Description

technical field [0001] The invention relates to the technical field of metal sheet metal forming, in particular to a method for evaluating damage and fatigue life of a micro-macro scale sheet metal forming process model. Background technique [0002] Due to high production efficiency and low processing costs, sheet metal forming processes are widely used in industrial production, especially in the automotive and mold industries. At present, the main problems in the sheet metal forming process of metal materials are: tearing, wrinkling and springback. The reason for these problems is that, on the one hand, the metal material will produce work hardening phenomenon during the sheet metal forming process at room temperature, resulting in an increase in tensile and yield strength and a decrease in toughness. In particular, the existence and formation of microscopic damage and defects inside the material during the processing will cause a sharp decrease in the service life of the...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings in the prior art, the present invention provides a damage and fatigue life evaluation method of a micro-macro scale sheet metal forming process model, which solves the problem that the micro-macro multi-scale coupling behavior cannot be considered in the existing numerical calculation of sheet metal forming and material damage and fatigue life prediction problems

Images