低速冲击下纤维/金属层合板抗分层性能研究

本文采用内聚力模型，对纤维/金属层合板(FMLs)在低速冲击载荷作用下抗分层性能进行研究。内聚力模型对裂纹的模拟具有它独特的优势：一是该模型不需要预先假设初始缺陷；二是在计算过程中随着裂纹的扩展，该方法不需要重新对结构进行网格划分。借助该模型，本文对低速冲击载荷作用下，纤维层合板(FRP)分层进行了模拟，并验证了该模型计算的有效性。在此基础上，本文研究了低速冲击载荷作用下，不同金属含量的纤维/金属层合板抗分层性能，并与纤维层合板进行了比较。最后从能量的角度讨论了金属含量与铺层结构对FMLs低速冲击性能的影响。

STUDY ON THE DELAMINATION OF FIBER-METAL LAMINATES UNDER LOW-VELOCITY IMPACT

The delamination of fiber-metal laminates(FMLs) under low-velocity impact is studied by employing the cohesive zone model.To validate the cohesive zone model in dealing with delamination of composite laminates,the delamination simulation is executed under the low-velocity impact and a relative good agreement with experimental data is achieved.Then,the delamination of FMLs with different metal ratios under low-velocity impact is computationally investigated and the results are compared with that of composite laminates.Finally,the effects of the lay-up and the content ratio of metal to the fiber on the delamination of fiber/metal laminates are studied from the viewpoint of the energy conservation.