Numerical studies of clamped square plate under the synergistic effects of fragments and shock wave

In order to study the typical damage modes and the critical transition conditions of clamped square plate under the synergistic effects of fragments and shock wave, the coupling damage process of target plate under the synergistic effects of fragments and shock wave was simulated by using SPH-FEM coupling method. Results were accomplished as below: (1) With the coupling load, target plate has two main damage modes, Mode I-petals bending failure; Mode II-tensile rupture failure. Mode II can be subdivided into two damage submodes, Submode IIa-The boundary of plates appears plastic deformation, center appears tensile rupture failure; Submode IIb-Both the boundary and center of plates appears tensile rupture failure. (2) The critical value of i^* (dimensionless impulse) between Mode I and Mode IIa is about 0.88; The critical value of i^*between Mode IIa and Mode IIb is about 0.64. (3) The break area of plates is not increased by i^*, when i^*=0.71, the break area reaches its maximum, about the 68% of the anti-blast effective area.