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�������պ����ѧѧ�� 2000, Vol. 26 Issue (5) :539-542    DOI:
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Unit Cell Geometric Model of 4-Step 3-D Braided Composites
CHEN Zuo-rong, ZHU De-chao, LU Meng*
Beijing University of Aeronautics and Astronautics,Dept. of Flight Vehicle Design and Applied Mechanics

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Abstract�� After briefly reviewing the proceeding of geometric model of 4-step 3-D (1×1) rectangular braided composites, yarn path in 4-step rectangular braiding process is analyzed. On this basis, a 3-D solid unit cell geometric model is proposed, the characteristics of geometry of 3-D braided composites are studied and yarn-jamming condition is discussed. Compared with conventional geometric models, the identified geometric model reflects the continuity of yarn in 3-D braided composites, which makes each unit cell assembled reasonably, so the structural integrity of 3-D braided composites is assured. The 3-D solid geometric model makes it possible to correctly consider the interactions between yarn and matrix for analysis of effective mechanic behaviors of 3-D braided composites.
Keywords�� composite materials   textile   three dimensional structure   fiber volume fraction   continuity     
Received 1999-04-06;
Fund:

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������, ��³�, ½��.��ά�IJ���֯���ϲ��ϵ�Ԫ���弸��ģ��[J]  �������պ����ѧѧ��, 2000,V26(5): 539-542
CHEN Zuo-rong, ZHU De-chao, LU Meng.Unit Cell Geometric Model of 4-Step 3-D Braided Composites[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2000,V26(5): 539-542
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