The deformation and detachment path of simply-supported and fully clamped mild steel quadrangular plates subjected to impulsive blast loads are investigated numerically. A comprehensive failure model that incorporates two competing mechanisms of damage due to ductile and shear failure is employed to simulate the progression of tearing within the plate. The stress triaxiality dependent Modified Mohr-Coulomb (MMC) fracture criterion is implemented in a finite element model, and experimental tensile and shear tests were carried out to calibrate the material parameters. The direction of crack propagation along the clamped plate support and the residual length are predicted for a wide range of impulse intensity, reproducing the failure modes observed experimentally. Furthermore, the developed model highlights the different failure mechanisms that occur in simply-supported plates, similar to those of panels subjected to localised blast loadings. Parametric studies are performed to establish dimensionless failure maps and investigate the influence of plate topology and boundary conditions on the dynamic response, for both square and rectangular geometries, thus offering an effective support for the design of impulsively loaded plates for advanced engineering applications.

数值研究了承受脉冲冲击载荷的简支全夹紧低碳钢四边形板的变形和脱离路径。一个综合的故障模型结合了两种由于韧性和剪切破坏而导致的破坏竞争机制，被用来模拟板内撕裂的进程。在有限元模型中实现了依赖于应力三轴性的修正Mohr-Coulomb（MMC）断裂准则，并进行了试验拉伸和剪切试验以校准材料参数。可以在很宽的脉冲强度范围内预测沿着夹紧的板支架的裂纹扩展方向和残余长度，从而再现了实验观察到的破坏模式。此外，所开发的模型突出显示了在简单支撑的板上发生的不同破坏机制，类似于承受局部爆炸载荷的面板。进行参数研究以建立无因次破坏图，并研究矩形和矩形几何形状的板拓扑和边界条件对动力响应的影响，从而为先进工程应用的脉冲加载板的设计提供了有效的支持。