复合材料泡沫夹层结构高速冲击有限元仿真研究

Finite Element Analyses on Sandwich Structure of Composite Skins and Foam Core Under High Velocity Impact

采用非线性有限元方法,在Abaqus/Explicit中建立了一种用于研究复合材料泡沫夹层结构高速冲击问题的有限元模型。模型利用VUMAT子程序定义了基于二阶Tsai-Wu失效判据的三维CFRP面板损伤模型;利用Crushable Foam弹塑性本构,结合剪切失效准则定义了泡沫夹芯的损伤模型;分别选取最大名义应变准则与基于能量的B-K准则描述面板/夹芯界面的损伤起始与扩展。CFRP面板材料模型与泡沫夹芯材料模型的仿真算例表明,模型与实验值具有较好的一致性。通过分析子弹残余速度与靶板弹道极限,表明复合材料泡沫夹层结构能够显著提高结构的抗高速冲击能力。

In this paper,a nonlinear finite element method is used to build a numerical model of composite-foam sandwich panels under high-velocity impact in Abaqus/Explicit.VUMAT subroutine was used to define a three-dimensional CFRP damage model based on the second rank expression for the Tsai-Wu failure criterion.The damage model of the PMI foam core was defined by Crushable Foam elastoplastic constitutive model combining with the shear failure criterion.The maximum nominal strain criterion and the B-K criterion based on energy is used to describe the damage initiation and evolution for interfaces between skins and core respectively.On the numerical example,an agreement has been reached for both CFRP material model and foam material model when compared with corresponding experiments.By analyzing the residual velocity and ballistic limit of the CFRP laminates,it is shown that the composite-foam sandwich panels can significantly improve the structural resistance to the high-velocity impact.