A method, system, device and medium for establishing bilinear constitutive parameters in engineering

By acquiring and correcting the bilinear constitutive parameters of the material, the problem of only tensile mechanical performance data in the material manual is solved, and a constitutive curve that meets the elastic-plastic analysis needs of parts is realized, providing effective data support for engine parts design.

CN119514295BActive Publication Date: 2025-04-01AECC SICHUAN GAS TURBINE RES INST
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Patent Information

Application Number
CN202510097332.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-22
Publication Date
2025-04-01
Estimated Expiration
2045-01-22

AI Technical Summary

Technical Problem

Some materials in the existing material manual only have tensile mechanical properties data, which cannot meet the needs of elastic-plastic analysis of parts.

Method used

The initial values ​​of bilinear constitutive parameters are obtained by using the parts prepared with the material to be calibrated, based on their elastic modulus, cross-sectional shrinkage, yield strength and tensile strength, and these parameters are evaluated and corrected through elastic-plastic finite element analysis and working load unloading tests.

Benefits of technology

The constitutive curve that meets engineering use is achieved through tensile mechanical performance data, providing data support for the strength design of engine parts, and this method has the advantages of few parameters, easy operation and strong engineering operability.

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Abstract

The present invention belongs to the field of aeroengines, relates to a bilinear constitutive curve design technology, and discloses a bilinear constitutive parameter engineering establishment method, system, equipment and medium, the method comprising: using a part prepared by a material to be calibrated, obtaining the initial value of the bilinear constitutive parameter according to tensile mechanical performance data; performing elastic-plastic finite element analysis on the part according to the initial value of the bilinear constitutive parameter, obtaining the first engineering stress and the first engineering strain of the part under the working load and the engineering residual strain of the part after the working load is unloaded; performing a working load loading and unloading test to obtain the real residual strain of the part; and evaluating and correcting the initial value of the bilinear constitutive parameter through the engineering residual strain and the real residual strain. The method of the present invention obtains a constitutive curve that can meet engineering use through tensile mechanical performance data, provides data support for the strength design of engine parts, and the method has the advantages of few required parameters, easy operation and strong engineering operability.
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