Application of Associated and Non-Associated Flow Metal Plasticity for F.S.S Sheet
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Date
2021-01-11
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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 σb was assumed σb=1 but the rb-values was computed
from Yld96 [15]