A method for constructing a compressive creep constitutive model for metal materials

By constructing a metal material compression creep constitutive model and introducing creep time thresholds and material parameters, the problem of describing the compression creep behavior of titanium alloy is solved, accurate prediction of creep strain and optimized design of structural parts are achieved, testing costs are reduced, and service reliability is improved.

CN120260762BActive Publication Date: 2025-08-19INST OF MECHANICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202510747886.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-06
Publication Date
2025-08-19
Estimated Expiration
2045-06-06

AI Technical Summary

Technical Problem

The prior art lacks a mathematical model that effectively describes the compression creep deformation behavior of titanium alloys, making it difficult to simulate or predict the deformation and life of materials under long-term service conditions, increasing the risk of failure of engineered structural parts due to long-term deformation.

Method used

A constitutive model of compression creep in metal materials was constructed. By introducing a creep time threshold related to nominal compression stress, it is assumed that creep deformation will no longer occur after exceeding the creep time threshold. The creep time threshold and material parameters A, n, m, and B were used to establish a creep constitutive model to describe the change relationship of creep strain with time.

Benefits of technology

It can describe the creep strain changes of metal materials under constant compression load over time, predict the creep strain under other loads through a small amount of test data, optimize structural parts design, improve service reliability, and reduce test costs.

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Abstract

The present invention provides a method for constructing a compressive creep constitutive model of a metal material, which comprises: 1) constructing a constitutive model of the metal material under nominal compressive stress; 2) determining the creep time threshold of the metal material; 3) determining the creep characteristic constant of the material A and B and creep time influencing parameters n and m ;4) Determine the material parameters A 、 n 、 m and B Substituting this into the constitutive model under nominal compressive stress yields a compressive creep constitutive model for metal materials. This method can describe the temporal relationship between creep strain and deformation under constant compressive loads, and can also predict the creep deformation behavior of metal materials under long-term compressive loads, thereby optimizing the design of structural components and improving their service reliability.
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