丢层结构复合材料加筋板压缩失效机理研究

Study on the compressive failure mechanism of composite stiffened plate with ply drop-off structure

为探究受到轴向压缩载荷时丢层结构对复合材料加筋板承载能力、破坏模式及破坏位置的影响,对丢层结构与常规铺层结构两种铺层方式的帽型长桁加筋板进行轴压试验,并通过Abaqus建立了丢层结构复合材料加筋板有限元模型,采用二维Hashin准则作为复合材料失效判据,与试验结合分析了两种构型复合材料加筋板的失效过程及抗压性能。有限元模型很好地预测了结构的极限载荷、破坏模式及破坏位置,与试验结果吻合较好。结果表明:(1)采用有限元方法得到的极限载荷与实验较吻合,丢层结构与常规结构破坏载荷误差分别为1.1%与4.7%,说明本文采用的建模方法合理有效,可以为实际工程应用提供指导;(2)合理的丢层结构对长桁承载能力及破坏模式并不会产生影响,但是会影响试验件破坏的位置。

In order to investigate the influence on composite stiffened plate load-bearing capacity,failure mode and failure location of the ply drop-off composite structure under axial compression,experimental studies were carried out for hat-shaped stringers with ordinary and ply drop-off layups.Finite Element(FE)models of composite stiffened plates with the ply drop-off structure were established by using Abaqus.The FE models adopt two-dimensional Hashin failure criterion and analyze the failure process and compressive performance of two types of composite stiffened plates.The FE models accurately predict the ultimate load,failure mode and failure location,which are in good agreement with the experimental results.The present study shows that the ultimate load obtained by the finite element(FE)method is in good agreement with the experiment.The failure load error of ply drop-off composite structure and the conventional structure is 1.1%and 4.7%,respectively,indicating that the modeling method adopted in this paper is reasonable and effective,and can provide guidance for practical engineering applications.Inaddition,it shows that appropriate ply drop-off does not influence the load-bearing capacity and failure mode of composite stiffened plate,but it may change the failure location.