A comprehensive strain-rate-dependent (SRD) finite element modeling procedure, based on continuum damage mechanics has been developed to predict the behavior of ultra-high molecular weight polyethylene (UHMWPE) fiber composite laminates under impact loading. A user-defined material subroutine implemented into ABAQUS/Explicit is used to define SRD constitutive damage model of UHMWPE composite. The effect of strain rate on the material properties is adapted to the experimental data by introducing a new hyperbolic function and the strain-rate effect factor (SEF) for use in the modeling. The range of ${10}^{-4}$ to ${10}^4{\mathrm{\hspace{0.17em}s}}^{-1}$ is considered for strain rate, which includes both high velocity and low velocity impact regimes. A homogenized sub-laminate approach is employed to more accurately capture the out-of-plane failure mechanisms. Cohesive Zone Model (CZM) with the constitutive model based on bilinear traction-separation is implemented to simulate the inter-laminar delamination between the sub-laminates. High velocity ballistic impact as well as low velocity drop-weight impact are simulated, and the results are validated with experimental observations from the literature. Results show that the presented SRD model, offers more accurate prediction of the projectile residual velocity compared to the SRD model using logarithmic function or without considering the strain rate effect. Moreover, detailed views of failure modes such as tension/shear fiber and matrix shear in layers, and the delamination patterns are obtained and investigated.

已经开发了一种基于连续损伤力学的综合应变率相关 (SRD) 有限元建模程序，以预测超高分子量聚乙烯 (UHMWPE) 纤维复合材料层压板在冲击载荷下的行为。在 ABAQUS/Explicit 中实现的用户定义材料子程序用于定义 UHMWPE 复合材料的 SRD 本构损伤模型。通过引入新的双曲线函数和用于建模的应变率效应因子 (SEF)，应变率对材料特性的影响适应了实验数据。范围${10}^{-4}$ 到 ${10}^4{\mathrm{\hspace{0.17em}秒}}^{-1}$考虑应变率，包括高速和低速冲击状态。采用均质子层压方法来更准确地捕获平面外故障机制。实施基于双线性牵引分离的本构模型的内聚区模型 (CZM) 来模拟子层压板之间的层间分层。模拟了高速弹道冲击和低速落锤冲击，并通过文献中的实验观察验证了结果。结果表明，与使用对数函数或不考虑应变率效应的 SRD 模型相比，所提出的 SRD 模型提供了更准确的弹丸剩余速度预测。而且，