Method for Adjusting the Extrapolated Hardening Curve of a Material

Adjusting the material's extrapolated hardening curve through the Bezier curve solves the problems of cumbersome operation and inflexible shape in traditional methods, and achieves fast, smooth connection and efficient identification of the hardening curve, meeting the needs of simulation software.

CN115438454BActive Publication Date: 2025-07-11BAOSHAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202110610561.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-06-01
Publication Date
2025-07-11
Estimated Expiration
2041-06-01

AI Technical Summary

Technical Problem

When dealing with material necking, it is difficult for the prior art to obtain accurate hardening curves within the 0-1 true strain range, and the interpolation curves of traditional constitutive models are cumbersome and inflexible in shape, making it difficult to meet the needs of simulation software.

Method used

The extrapolated hardening curve is determined through three points by using Bezier curve parameter adjustment to achieve smooth connection of the hardening curve, and the shape and stress value are quickly adjusted in combination with spreadsheet software.

Benefits of technology

It realizes fast, smooth connection and shape flexibility of hardening curves, improves the identification efficiency and accuracy of material flow curves in simulation, and simplifies the operation process.

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Abstract

The present invention discloses a method for adjusting the extrapolated hardening curve of a material, comprising the steps of: 1. Starting a uniaxial tensile experiment on the material and obtaining an engineering stress-strain curve; 2. Obtaining an experimental hardening curve from the engineering stress-strain curve of the material; 3. Supplementing the true strain of the experimental hardening curve to 1, i.e., the model fitting curve; 4. Taking a tangent line at the necking point of the experimental hardening curve; 5. Generating a Bézier curve using a second-order Bézier curve, i.e., the extrapolated hardening curve; 6. Adjusting the shape and stress value of the Bézier curve by controlling the parameters x1 and y2 to make the Bézier curve coincide with the model fitting curve and determining the reference values of x1 and y2; 7. Adjusting the extrapolated hardening curve according to actual needs. The present invention can determine the extrapolated hardening curve through three points, realize the adjustment of the extrapolated hardening curve by adjusting the parameters of the Bézier curve, and smoothly connect with the experimental hardening curve, meeting the requirements for identifying the material flow curve during the material tensile experiment and simulation benchmarking process.
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