含紧固穿透分层复合材料层板的疲劳扩展

Delamination Growth in Composite Laminate with Fasteners under Fatigue Load

对含预置穿透分层复合材料层板开展压缩强度和压缩疲劳试验,获得结构的极限载荷,并研究层板的分层扩展特性。基于ABAQUS软件建立含穿透分层复合材料层板有限元模型,通过VCCT计算能量释放率,采用B-K准则来模拟层间分层的扩展。引入VUMAT子程序,采用改进的Hashin准则判断单元损伤;基于累积损伤理论和剩余强度理论,弱化材料性能,对含穿透分层和含紧固穿透分层复合材料层板的疲劳力学行为进行分析,讨论了紧固件等参数对层板分层扩展的影响。

A developed finite element model combining VCCT with VUMAT subroutine was established to study the inhibition mechanisms of fasteners on the delamination growth of composite laminates with penetrated delamination based on ABAQUS software.The VCCT was used to calculate the energy release rate,and the delamination growth was simulated by B-K criterion.The residual strength model and the improved Hashin criterion in VUMAT subroutine were used to weaken the properties of materials and judge the failure of element.A parametric study on the effects of loading cycles and the level of cyclic loading was further performed.To demonstrate the developed model,the compressive strength test and compressive fatigue test were carried out.The results show that under static load,the delamination growth of composite laminates with penetrated delamination is inhibited by fastener via local buckling;whilethe fatigue delamination growth is inhibited via local buckling and element damage under fatigue load.