In this study, laboratory-scale Split Hopkinson pressure bar (SHPB) tests were conducted on commercial armor plates composed of 2139 and 7056 Al alloys to investigate their dynamic compressive properties in relation to adiabatic shear band (ASB) formation. The results were then correlated to those of the ballistic performance as measured from V₅₀ ballistic impact tests. In the SHPB tests, the 2139 alloy was compressed and flattened with traces of cracking, whereas cracks initiated in a shear mode in the 7056 alloy and propagated to produce several pieces. The cracking behavior was further analyzed by interrupted SHPB tests, which confirmed that shear cracking occurred through the formation of deformed ASBs and subsequent locally transformed ASBs. These processes started much earlier in the 7056 alloy; therefore, it showed a lower critical strain for initiating the ASBs and lower resistance to ASB formation. This result corresponded well with the actual V₅₀ ballistic impact test results, which confirmed the better ballistic performance of the 2139 alloy. The resistance to dynamic and ballistic deformation was quantitatively discussed using the susceptibility to ASB formation.

在这项研究中，对由2139和7056铝合金组成的商业装甲板进行了实验室规模的霍普金森压力棒（SHPB）试验，以研究它们与绝热剪切带（ASB）形成有关的动态压缩特性。然后将结果与从V ₅₀测得的弹道性能相关弹道冲击试验。在SHPB测试中，2139合金被压缩并压扁，并带有裂纹痕迹，而裂纹在7056合金中以剪切模式萌生，并扩展成几片。通过中断的SHPB测试进一步分析了开裂行为，该测试证实了剪切开裂是通过变形的ASB和随后局部变形的ASB的形成而发生的。这些过程是在7056合金中开始得更早的。因此，它显示出较低的引发ASB的临界应变和较低的ASB形成抗性。这个结果与实际的V ₅₀吻合良好弹道冲击试验结果，证实了2139合金具有更好的弹道性能。使用对ASB形成的敏感性定量讨论了对动态和弹道变形的抵抗力。