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�������պ����ѧѧ�� 2010, Vol. 36 Issue (7) :789-793    DOI:
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1. �������պ����ѧ �ѧԺ, ���� 100191;
2. �������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100191
Material parameters in 3D finite element analysis of composite structure
Zhao Libin1, Qin Tianliang1, Li Jiaxi1, Fu Yue2*
1. School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The method to determine 3D composite material properties by means of engineering constants of composite lamina was summarized by investigating lots of existed literatures. The effect of uncertain variables in material parameters upon the stiffness prediction was researched by 3D numerical simulation and the corresponding experiments of composite π joint structure. Further, the initial failure of composite π joint structure was assessed by the modified maximum stress and strain, Tsai-Hu and Hashin failure criteria. The damage onset loads with different failure criteria and material parameter model were compared and the influence of material parameter model on the prediction of initial failure load and location was expatiated together with the experimental data. The research provides reference for numerical analysis of general 3D composite laminate structures. Moreover, it offers theoretical support for understanding mechanics behaviors and accurate strength prediction of composite π joint.
Keywords�� composite materials   adhesively joint   parameter estimation   strength of materials     
Received 2009-05-15;
Fund:

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About author: ������(1976-),Ů,������,�������ض���,lbzhao@buaa.edu.cn.
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������, ������, �����, ����.���ϲ��Ͻṹ��ά����Ԫ�����IJ��ϲ���[J]  �������պ����ѧѧ��, 2010,V36(7): 789-793
Zhao Libin, Qin Tianliang, Li Jiaxi, Fu Yue.Material parameters in 3D finite element analysis of composite structure[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(7): 789-793
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