A calibration method of a metal material cumulative damage model

By using uniaxial cyclic loading tests and least squares fitting, a cumulative damage model for metallic materials was constructed, which solved the problem that existing models could not accurately describe cumulative damage, improved the accuracy of CAE simulation analysis, and enhanced the accuracy of part forming and vehicle collision simulation.

CN116609213BActive Publication Date: 2025-12-23CHONGQING INNOVATION CENTER OF BEIJING INSTITUTE OF TECHNOLOGY +1
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Patent Information

Application Number
CN202310646929.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-02
Publication Date
2025-12-23
Estimated Expiration
2043-06-02

AI Technical Summary

Technical Problem

Existing GISSMO and MMC fracture failure models cannot accurately describe the cumulative damage behavior of metallic materials, resulting in insufficient accuracy of CAE simulation analysis in predicting damage and failure during part forming and service processes.

Method used

A uniaxial cyclic loading test was adopted. By setting cyclic control conditions for strain-triggered unloading and stress-triggered loading, and combining the least squares method for fitting, a cumulative damage model of metallic materials was constructed, and the equivalent plastic strain-cumulative damage curve of the material was calibrated.

Benefits of technology

It achieves simple, fast, and low-cost fitting of cumulative damage in metal materials, improves the accuracy of CAE simulation analysis, better describes the cumulative damage of materials during deformation, and enhances the accuracy of simulation of the entire process from metal sheet to part forming to whole vehicle collision.

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Abstract

The application discloses a metal material cumulative damage model and a calibration method thereof, and the calibration method comprises the following steps: (1) carrying out uniaxial cyclic loading test to obtain an engineering stress-strain curve of the material; (2) calculating the Young's modulus E under different engineering strains; (3) calculating the cumulative damage D under different strains and obtaining data points of the cumulative damage and the engineering strain; (4) converting the data points of the cumulative damage and the engineering strain into data points of the cumulative damage and the equivalent plastic strain; and (5) calibrating the cumulative damage model parameters. Through the construction of the cumulative damage model and the design of the cyclic control conditions of the model parameter calibration test, the application realizes simple, fast and low-cost metal material cumulative damage test and fitting, obtains the equivalent plastic strain-cumulative damage curve which is closer to the actual situation of the metal material, and overcomes the problem that the existing model cannot accurately describe the cumulative damage behavior of the material.
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