Damage and Fatigue Life Evaluation Method for Micro-Macro Scale Sheet Metal Forming Process Model

Abstract

The invention discloses a method for evaluating damage and fatigue life of a micro-macro scale sheet metal forming process model. The invention establishes a microscopic plastic constitutive model and couples macroscopic geometry, and at the same time simulates the sheet metal forming process. On this basis, establishes a micro-macrocoupling fatigue damage model for fatigue life prediction, and explores the sheet metal forming process and fatigue failure mechanism. The application provides theoretical guidance and basis for process optimization. Explore the distribution of material properties and plastic deformation evolution in the sheet metal forming process from a microscopic perspective; study the influence and contribution of microscopic features such as grain size, orientation distribution, and precipitated phase distribution on the sheet metal forming process; further couple macroscopic models and processes to study fatigue damage and assess component fatigue life. The invention is a reliable and efficient calculation model and evaluation method, and the establishment of related models and algorithms has important scientific innovation and 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...

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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

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