三维六向编织复合材料力学性能的实验研究

通过拉伸 ( 含开孔拉伸 ) 、压缩 ( 含开孔压缩 ) 、面内剪切及冲击后压缩实验,获得了三维六向编织复合材料的主要力学性能参数。基于宏观实验,探讨了材料在拉伸、压缩及剪切载荷作用下的破坏模式和失效机理,分析了开孔类型 ( 机械孔、编织孔 ) 对材料拉、压性能的影响并研究了冲击对材料压缩性能的影响。所获结果为进一步研究三维六向编织复合材料的刚度、强度预报奠定了基础。

EXPERIMENTAL INVESTIGATION OF THE MECHANICAL PROPERTIES OF 3D 6-DIRECTIONAL BRAIDED COMPOSITES

The main mechanical properties of the 3D 6-directional braided composites were obtained by tensile,compressive,in-plane shear,and compressive after impact experiments.The bar specimens with two types of holes,mechanical circular hole or braided circular hole,were used for tensile and compressive tests.The damage modes and failure mechanism of the material under tensile,compressive and shearing loads were experimentally studied.The influence of the two types of holes(mechanical hole and braided hole) on the tensile and compressive mechanical properties was analyzed.The effect of impact on the compressive mechanical properties was also studied.The pre-sent work establishes a foundation for the predictions of stiffness and strength of the 3D 6-directional braided composites.