含预制脱粘的加筋壁板损伤扩展

DAMAGE EXPANSION OF STIFFENED PANEL WITH PREFABRICATED DEBONDING

复合材料加筋壁板在制备过程中容易在筋条蒙皮胶界面处存在缺陷,加速了蒙皮与筋条界面脱粘,在极大程度上影响结构的承载能力。基于Abaqus有限元软件用内聚力模型(CZM)和虚拟裂纹闭合技术(VCCT)两种方法对筋条蒙皮界面含预制脱粘的加筋壁板损伤扩展进行研究,并对比试验结果验证了模型的合理性。给出预制脱粘前缘损伤起始时各型能量释放率的分布;进一步研究不同预制脱粘的位置、面积对加筋板最终破坏状态和结构承载能力的大小。对比发现脱粘前缘损伤起始时II型能量释放率的贡献最大;预制脱粘位于外侧时结构的承载能力比位于中部强;结构的承载能力随着预制脱粘面积的增加而减小。

Composite stiffened panels always have defects at the bonding surface in preparation,which accelerates the debonding of the interface between skin and stringer,greatly affects the bearing capacity of the structure.The model of stiffened panel with prefabricated debonding at the interface of stiffened strip and skin was established with both cohesive zone model(CZM)and virtual crack closure technique(VCCT)in ABAQUS,and the rationality of model was verified by experiments.The distribution of energy release rate in prefabricated debonding leading edge was given and the effect of debonding position and area on stiffness and carrying capacity was analyzed.The results indicate that the contribution of type II energy release rate to damage initiation is the greatest;the bearing capacity of the prefabricated debonding structure is stronger than that is in the middle when it is located in outside;the carrying capacity of the structure decrease with the increase of prefabricated debonding area.