Z-pin增强复合材料Ⅰ型断裂韧性数值分析  

Numerical study on the mode Ⅰ fracture toughness of Z-pin reinforced laminates

作　　者：杨帆[1] 郑锡涛[1] 李亚智[1] 焦晓辉[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《复合材料学报》2009年第4期163-168,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(10872167);西北工业大学毕业设计(论文)重点扶持项目

摘　　要：采用细观力学方法以及虚拟裂纹闭合法(VCCT)对含有Z-pin增强复合材料双悬臂梁(DCB)结构Ⅰ型断裂韧性进行了研究。利用有限元法建立了结构模型,采用实体单元模拟复合材料层压板结构和非线性弹簧元模拟Z-pin。通过计算应变能释放率对含有不同体积分数Z-pin的复合材料层压板Ⅰ型断裂韧性与不含Z-pin的复合材料层压板Ⅰ型断裂韧性进行了对比分析。研究表明,含有Z-pin增强复合材料双悬臂梁(DCB)结构Ⅰ型断裂韧性在裂纹扩展过程中受到Z-pin桥联作用的影响而显著增强,且其增强效果与Z-pin的体积分数、处在桥联区的Z-pin数目均相关,这表明Z-pin增强方法能够有效提高复合材料层压板的分层扩展阻力。The mode Ⅰ fracture toughness of Z-pin reinforced double cantilever beam configuration laminates was studied based on mesomechanics and virtual crack closure technique（VCCT）. A finite element model was built using solid elements to model the composite laminates and non- linear combined elements to simulate the Z- pin reinforcement. The numerical results of the strain energy release rate were compared between the fracture toughness of the mode Ⅰ composite laminate reinforced with the Z-pin and that of the mode Ⅰ composit＇e laminate without the Z-pin. The study demonstrates that Z-pin reinforcement can increase the composite delaminated resistance and reinforce the fracture toughness of the mode Ⅰ composite laminate aggressively. The influence of design parameters such as the number of Z-pin in the bridging area, the Z-pin density and some other parameters on the toughness enhancement of Z-pinned laminates was investigated.

关 键 词：复合材料 Z-PIN Ⅰ型断裂 虚拟裂纹闭合法 

分 类 号：TB332[一般工业技术—材料科学与工程]