In this study, the high-velocity impact behavior of new designed sandwich structures with syntactic foam core and FML skins is investigated by experimental and numerical approaches. An appropriate numerical model is developed in order to modelling of the impact behavior of sandwich structures using the finite element software ABAQUS/Explicit. In this model, two VUMAT subroutine are presented to simulate the constitutive models of GFRP composite and syntactic foam. In addition, a multiscale finite element procedure is employed to predict the effective mechanical properties of woven orthogonal composite from known properties of its constituents. This procedure is implemented the numerical homogenization techniques using Python scripting. High-velocity impact tests are performed using a gas-gun and steel conical projectiles to assess the accuracy of the numerical model. To this end, the numerical model is validated by comparing the high-velocity impact behavior of sandwich structures to that obtained from experimental study and demonstrated to be effective and accurate. The presented numerical model can predict the residual velocity and perforation energy with 88.8% and 97.4% accuracies, respectively. Then the validated numerical model is employed to investigate the effect of projectile shape, projectile mass, and stacking sequence of skins on the impact behavior of the sandwich structure.

在这项研究中，通过实验和数值方法研究了具有复合泡沫芯和 FML 蒙皮的新型夹层结构的高速冲击行为。开发了一个合适的数值模型，以便使用有限元软件 ABAQUS/Explicit 对夹层结构的冲击行为进行建模。在该模型中，提供了两个 VUMAT 子程序来模拟GFRP 复合材料和复合泡沫的本构模型。此外，采用多尺度有限元程序从其成分的已知特性预测编织正交复合材料的有效机械特性。这个程序是执行数字使用 Python 脚本的同质化技术。使用气枪和锥形钢弹进行高速冲击试验，以评估数值模型的准确性。为此，通过将夹层结构的高速冲击行为与从实验研究中获得的行为进行比较来验证数值模型，并证明该模型是有效和准确的。所提出的数值模型可以分别以88.8%和97.4%的准确率预测剩余速度和射孔能量。然后利用经过验证的数值模型研究弹丸形状、弹丸质量和蒙皮堆叠顺序对夹层结构冲击行为的影响。