摘要
本文通过实验测定了三维编织结构复合材料侧边未切割、受切割和中央钻孔试件的拉伸性能，对比了受切割和未切割纤维对于试件侧边拉伸应变的影响，并且讨论了拉伸失效的机理和原因．发现受切割和钻孔试件的拉伸性能低于未加工试件的性能，受切割侧边的拉伸应变高于未切割侧边的拉伸应变，三维编织结构复合材料的拉伸失效主要由纤维断裂引起的．文中还对三维编织结构复合材料的孔边应力集中现象进行了研究，并进行了深入分析，得到一个重要结论，即四步法复合材料的孔边应力集中系数比传统层板复合材料和金属材料的低．从这个意义上说，三维编织结构复合材料适合于作为含孔结构的连接件．
Tensile properties for three kinds of the composite specimens (with cut edge, with uncut edge or with central drilled hole) are tested and compared. The effect of cut fibers on the perfermance of the specimens is examined, and the mechanism for the material′s tensile failure discussed. It is found that the tensile strength for cut or drilled.Specimens is somewhat lower than the strength of uncut specimens, and that the tensile strain at specimen′s cut edge is higher than that of uncut edge. It is also found that the failure of the specimens is mainly caused by fiber breakage. The investigation for the stress distribution of those specimens with central hole shows that the stress concentration coefficient around holes for 4 step braided composite is lower than what happens on laminates and metals. The fact seems to suggest that 4 step braided composite is suitable for the use on joint structure which containing holes.
出处
《实验力学》
CSCD
北大核心
1997年第3期335-341,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金
中国博士后基金
关键词
复合材料
三维编织
力学性能
应力集中
断裂
composite materials, three dimensionally braiding, mechanical properties, stress concentration, fracture.
