We have developed a heuristic, closed-form model for estimating the ballistic performance of layered, in-contact aluminium targets that are penetrated by a rigid projectile through ductile hole growth. The model uses an estimated material resistance for each layer, based on the specific cavitation energy concept. Weighting of the material resistance by the corresponding layer thickness leads to the effective (or average) target resistance of the in-contact layers, which we termed as the target stack resistance. For in-contact layers, we propose that the resistance of each layer is influenced by its relative position in the stack. The in-contact plates that are subsequent to the layer that is being penetrated (the backing layers), provide additional support (a reinforcement effect) and by that increase the resistance to ductile hole growth in the penetrated layer. A campaign of ballistic experiments and numerical simulations is performed to compare the performance of monolithic and in-contact layered 6061-T651 aluminium targets against 7.62 mm APM2 projectiles. The developed model is compared with the experimental and numerical results and is found to provide good agreement. An unexpected prediction of the model is verified by numerical simulations.

我们已经开发出一种启发式，封闭形式的模型，用于估计通过延性孔的生长而被刚性弹丸穿透的层状，接触铝靶的弹道性能。该模型基于特定的空化能量概念，对每一层使用估计的材料电阻。通过相应的层厚度对材料电阻进行加权可得出有效（或平均）目标内接触层的电阻，我们称为目标堆叠电阻。对于接触层，我们建议每一层的电阻受其在叠层中的相对位置的影响。在被穿透层（衬里层）之后的内接触板提供了额外的支撑（增强效果），从而增加了对被穿透层中延性孔生长的抵抗力。进行了一系列的弹道实验和数值模拟，以比较整体式和接触式分层6061-T651铝靶材与7.62毫米APM2弹丸的性能。将开发的模型与实验和数值结果进行比较，发现可以提供良好的一致性。通过数值模拟验证了模型的意外预测。