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인장 - 압축 비대칭성을 고려한 AZ31 판재의 항복함수 구성
윤종헌(J. H. Yoon),Oana Cazacu(O. Cazacu),이정환(J. H. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In order to take into account strong anisotropy and tension-compression asymmetry of AZ31 sheet alloy simultaneously, Cazacu-Plunkett-Barlat (CPB06, Cazacu et al., 2006) yield criterion was adopted in material modeling. The variation of anisotropic coefficient which describe the yield surface evolution of AZ31 is optimized using an interpolation function based on the specific calibration results. It generates continuously yield surfaces, which makes it possible to describe different hardening rates in tension and compression as well as tension-compression asymmetry of magnesium alloys.
Yoon, Jonghun,Cazacu, Oana,Lee, Jung Hwan Trans Tech Publications, Ltd. 2013 Key Engineering Materials Vol.535 No.-
<P>In spite of this progress in predicting ductile failure, the development of macroscopic yield criteria for describing damage evolution in HCP (hexagonal close-packed) materials remains a challenge. HCP materials display strength differential effects (i.e., different behavior in tension versus compression) in the plastic response due to twinning. Cazacu and Stewart [1] developed an analytic yield criterion for a porous material containing randomly distributed spherical voids in an isotropic, incompressible matrix that displays tension-compression asymmetry. The matrix material was taken to obey the isotropic form of the Cazacu et al. [2] yield criterion, which captures the tension-compression asymmetry of the matrix material. In this paper, finite element calculations of a round tensile bar are conducted with the material behavior described by the Cazacu and Stewart [1] yield criterion. The goal of these calculations is to investigate the effect of the tension-compression asymmetry on the necking induced by void evolution and propagation.</P>