A comprehensive theoretical and experimental investigation is presented of the behavior of polyurea composites subjected to high strain-rate impact loading. The composites under consideration consist of an assembly of steel sections and inserts manufactured from layers of polyurea or polyurea augmented with aluminum layers (AL). A finite element model (FEM) is developed to predict the dynamics of this class of polyurea composites by integrating the dynamics of the solid steel sections with those of polyurea using the Golla-Hughes-Mctavish (GHM) mini-oscillator approach. The predictions of the developed FEM are compared to the predictions of the commercial finite element package ANSYS and validated experimentally by using the Split Hopkinson Pressure Bar (SHPB) at high strain rates ranging between 1000 s⁻¹ and 5000 s⁻¹. Comparisons are also established between the behavior of the different composite configurations in an attempt to demonstrate the effectiveness of these composites in mitigation of the structural response under impact loading. Close agreements are demonstrated between the theoretical predictions and the obtained experimental results. The presented theoretical and experimental tools are envisioned to enable the design of effective means for the mitigation of undesirable effects of impact and blast loading on many critical structures.

进行了全面的理论和实验研究，介绍了聚脲复合材料在高应变速率冲击载荷下的行为。所考虑的复合材料由钢型材和插入件组成，这些插入件由聚脲层或铝层（AL）增强的聚脲层制成。通过使用Golla-Hughes-Mctavish（GHM）微型振荡器方法，通过将实心钢截面的动力学与聚脲的动力学相集成，开发了一种有限元模型（FEM）来预测此类聚脲复合材料的动力学。将开发的有限元分析的预测结果与商业有限元软件包ANSYS的预测结果进行比较并通过使用裂开式霍普金森压力棒（SHPB）在1000 s ^-1至5000 s ^-1的高应变率下进行了实验验证。在不同复合材料构型的行为之间也进行了比较，以试图证明这些复合材料在减轻冲击载荷下的结构响应方面的有效性。理论预测和获得的实验结果之间显示出紧密的一致性。设想了所提出的理论和实验工具，以便能够设计出有效的方法来减轻冲击和爆炸载荷对许多关键结构的不良影响。