三维编织复合材料拉伸与弯曲声发射特征分析

 论述了声发射技术在三维编织复合材料拉伸和弯曲过程中的应用以及试验方法,描述了三维编织复合材料拉伸与弯曲过程中声发射的特征。拉伸试验结果表明:编织角小的试件,其应力应变曲线基本为直线,损伤为脆性特征;编织角大的试件,应力应变曲线表现出双线性,各自呈现出脆性破坏特征。弯曲试验表明:小编织角复合材料的载荷挠度曲线保持线性关系;大编织角复合材料的载荷挠度曲线是非线性关系。

Acoustic emission analysis of the flexural and tensile properties of 3-D braided composite materials

This paper discusses the application and experimental method of acoustic emission(AE) for characterizing 3-D braided composite material under tensile and flexural fatigue loading.It describes the features of acoustic emission when applied to 3-D braided composite material under tensile and flexural fatigue loading.The results of tension experiment show the stress-strain curve exhibits linear relation for 3-D braided composite material with smaller surface braided angle and the tensile failure presents brittleness feature.When the surface braided angle is bigger,the stress-strain curve shows bilinear relation and tensile failure presents brittleness damage,respectively.The results of flexural experiment show load-deflection curve is linear relation for 3-D braided composite material with smaller surface braided angle,while the load-deflection curve is non-linear relation with bigger surface braided angle.