Influence of Parameter Identification of Anisotropic Yield Function on Spring-Back Prediction in Finite Element Simulation of Sheet Metal Forming Process

Abstract:

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The anisotropic plastic behavior of metallic sheet has a significant influence on spring-back, and is usually modeled by anisotropic yield function in numerical simulation. Material parameters of anisotropic yield function are generally identified either by yield stresses or by r-values, or both of them. For Hill1948 and Yld89 anisotropic yield functions, r-values are still widely used to calibrate their material parameters in spring-back prediction. Here, yield stresses and r-values were respectively used to calibrate them, and the differences of the spring-back simulated by these two identification methods were discussed. To evaluate their accuracy, the simulation results were compared with the spring-back calculated by Yld2000-2d anisotropic yield function. The result shows that when yield stresses were used to identify the material parameters of Hill1948 and Yld89 yield functions, the simulated spring-back was closer to that of Yld2000-2d yield function.

Info:

Periodical:

Advanced Materials Research (Volumes 189-193)

Edited by:

Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang

Pages:

1465-1471

DOI:

10.4028/www.scientific.net/AMR.189-193.1465

Citation:

S. L. Zang et al., "Influence of Parameter Identification of Anisotropic Yield Function on Spring-Back Prediction in Finite Element Simulation of Sheet Metal Forming Process", Advanced Materials Research, Vols. 189-193, pp. 1465-1471, 2011

Online since:

February 2011

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$35.00

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