破片与冲击波对固支方板的耦合毁伤效应数值研究

为探索固支方板在破片与冲击波耦合作用下的典型破坏模式及临界转换条件,采用耦合的SPH-FEM方法数值模拟靶板在破片与冲击波耦合作用下的破坏过程。结果表明:(1)耦合载荷作用下靶板的损伤模式主要分成两种,模式I:花瓣弯曲破坏;模式Ⅱ:拉伸断裂破坏。模式Ⅱ还可细分为两种,模式Ⅱa:板边界产生塑性变形,中心产生拉伸断裂破坏;模式Ⅱb:板边界和中心均产生拉伸断裂破坏。(2)模式I和模式Ⅱa之间的临界i*(无量纲冲量)值约为0.88;模式Ⅱa与模式Ⅱb之间的临界i*值约为0.64。(3)靶板的破口面积并不是随着i*的增大而增大,当i*=0.71时,破口面积达到最大值,约为抗爆有效面积的68%。

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 tar-get 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 subdi-vided 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.