低速冲击下纤维/金属层合板抗分层性能研究

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

论文采用内聚力模型,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,论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,论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.

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 de lamination of fiber/metal laminates are studied from the viewpoint of the energy conservation.