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Yield surface of transversely isotropic foams under axisymmetric loadings
Chen Wei, Lu Zixing*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The effective stress and mean stress description method for two-dimension (2D) materials was applied to obtain the formulae of characteristic mean stress, characteristic stress, and characteristic strain of three-dimension (3D) transversely isotropic materials under proportional axisymmetric loadings. Then the yield surface model expressed by characteristic mean stress and characteristic stress was established. Through the analysis of transversely isotropic face-centered cubic unit cell model by using finite-element method (FEM), the impact of cell aspect ratio on the elastic properties and the yield surface for transversely isotropic foams was also investigated. The results show that the increase of cell aspect ratio leads to the augment of longitudinal modulus, the decrease of transverse modulus and the anticlockwise rotation of yield surface. The model corresponds well with the modified Gurson-s model and the FEM results, and thus provides a new description for 3D transversely isotropic foams- yield surface.
Keywords�� foams   yield   finite element method     
Received 2009-05-06;


About author: �� ΰ(1982-),Ů,�������Ƹ���,��ʿ��,chenwei222333@163.com.
��ΰ, ¬����.��Գ��غ��º�۸���ͬ����ĭ���ϵ�������[J]  �������պ����ѧѧ��, 2010,V36(7): 853-856
Chen Wei, Lu Zixing.Yield surface of transversely isotropic foams under axisymmetric loadings[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(7): 853-856
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