Application of Associated and Non-Associated Flow Metal Plasticity for F.S.S Sheet

Abstract:

In the last decade, several phenomenological yield criteria for anisotropic material has been proposed to improve the modeling predictions about sheet metal-forming processes. In regard to this engineering application, two proprieties of models have been used. If the yield function and the plastic potential are not same (not equal), the normality rule is non associative flow rule (NAFR), otherwise, when the stresses yield has been completely coupled to the anisotropic strain rate ratio (plastic potential), is called the associated flow rule (AFR). The non-associated flow rule is largely adopted to predict a plastic behavior for metal forming, accurately about à strong mechanical anisotropy presents in sheet metal forming processes. However, various studies described the limits of the AFR concept in dealing with highly anisotropic materials. In this study, the quadratic Hill1948 yield criteria is considered to predict mechanical behavior under AFR and NAFR approach. Experiment and modeling predictions behaviour of normalized anisotropic coefficient r (θ) and σ (θ) evolved with θ in sheet plane. and the equibiaxial yield stress σ_b was assumed σ_b=1 but the r_b-values was computed from Yld96 [15].

• Periodical: Defect and Diffusion Forum (Volume 406)
• Pages: 473-480
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.406.473
• Online since: January 2021
• Authors: O Chahaoui*, Houssem Soltani, Nadjoua Matougui
• Keywords: Anisotropic Metal, Constitutive Model, Non-Associated Flow Rule, Sheet Metal Forming, Yield Function

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