Z-pin植入对二维机织复合材料层合板力学性能影响的数值模拟  

Numerical simulation of the Z-pin inserting effect on mechanical properties of 2D woven composite laminate

作　　者：张涛涛[1] 周洪 史文华 燕瑛[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]航天神舟飞行器有限公司,北京100074

出　　处：《复合材料学报》2014年第2期295-303,共9页Acta Materiae Compositae Sinica

基　　金：国家重点基础研究发展计划(2011CB606105)

摘　　要：针对植入Z-pin后的碳纤维增强平纹机织复合材料的微观结构,建立了含Z-pin机织复合材料单层板和层合板的单胞模型。预测了Z-pin直径、分布间隔对单层板的面内纵向拉伸力学性能的影响,发现含有Z-pin的机织复合材料单胞在受面内拉伸时,会在Z-pin附近出现应力集中,单胞首先会在应力集中区域发生失效而导致强度降低。通过三维单胞模型模拟了Z-pin在层合板中拉出脱离的过程,得出了不同Z-pin直径、不同分离层厚度下的拉拔力-位移曲线。建立了用非线性弹簧模拟Z-pin的双悬臂梁(DCB)模型,结合虚拟裂纹闭合技术(VCCT),模拟了含有Z-pin复合材料层合板的Ⅰ型裂纹扩展,结果表明:Z-pin直径越大,分布越密,层合板的等效Ⅰ型应变能释放率GIC越大,且直径越大,GIC随裂纹扩展的波动幅度越大,分布越密,GIC波动的波长越小。The Z-pinned woven composite unit cell models of lamina and laminate were developed based on the plain woven composite micro-structure with carbon fiber reinforced after Z-pin inserted.The influence of Z-pin diameter and distribution interval on the in-plane longitudinal tensile mechanical properties was predicted.The stress concentration around Z-pin in the Z-pinned woven composite unit cell model was recognized.The strength would be reduced after unit cell been failed due to the stress concentration.The process of Z-pin pulled out from laminated plates was simulated.The pull-out force versus displacement curves with different Z-pin diameters and thicknesses of separate sub layer were obtained.The double cantilever beam（DCB）with nonlinear spring element and virtual crack closure technique（VCCT）was developed.The mode I crack propagation of Z-pinned laminate was simulated.It was concluded that equivalent mode I energy release rate GICof the laminate and its waviness amplitude were larger caused by larger Z-pin diameter.Moreover,the denser the Z-pin distribution was,the larger GICwas and the smaller its wavelength was.

关 键 词：Z-PINS 机织复合材料 单胞模型 面内力学性能 非线性弹簧元 双悬臂梁 Ⅰ型层间韧性 

分 类 号：TB330.1[一般工业技术—材料科学与工程]