冲头形状对复合材料层合板低速冲击力学行为影响研究

Effect of punch shape on mechanical behavior of composite laminate under low-velocity impact

为掌握冲头形状对碳纤维复合材料层合板低速冲击响应的影响规律,了解层合板内部的损伤机制与失效模式,用Abaqus有限元软件对层合板进行低速冲击力学行为的数值模拟,为考虑多种失效模式混合,用三维Hashin强度准则与双线性内聚力模型分别预测层合板层内与层间的渐进损伤演化,重点讨论冲头形状对层合板冲击响应的影响规律。数值模拟结果与现有低速冲击试验数据较吻合,最大误差低于5%,验证了模型的可靠性。结果表明:冲击接触面积与穿透程度是造成层合板在不同冲头形状下冲击响应差异的主要原因,冲击接触面积较小的冲头对层合板的穿透程度大,会造成层合板沿厚度方向的损伤积累。冲击接触面积较大的冲头对层合板的穿透程度小,会造成层合板沿面内的层间分层损伤扩展。

In order to master the influence of punch shape on the low‐velocity impact response of carbon fiber composite laminate,and to understand the damage mechanism and failure mechanism inside the laminate,Abaqus finite element software was used to simulate the low‐velocity impact mechanical behavior of laminates.And in order to consider the mixing of multiple failure modes,the three‐dimensional Hashin failure criterion and bilinear cohesion model were used to predict the progressive damage evolution of laminate layers and layers,the influence of punch shape on the impact response of laminate was discussed in detail.The numerical simulation results were in good agreement with the existing experimental data under low‐velocity impact.The maximum error was less than 5%,and the reliability of the model was verified.The results show that the impact contact area and penetration degree are the main reasons for the difference in impact response of laminates under different punch shapes,and the penetration degree of laminates by punches with small impact contact area is large,which will cause damage accumulation of laminates along the thickness direction.The penetration degree of the laminate by the punch with a large impact contact area is small,which will cause the laminate to spread through the lamination damage along the surface.