小当量柱型装药水下近场爆炸固支单层方形钢板毁伤特性研究

为研究小当量柱形装药水下近场爆炸固支单层方形钢板毁伤特性,采用高精度龙格库塔间断迦辽金(Runge-Kutta discontinuous Galerkin,RKDG)方法求解柱形装药水下近场爆炸载荷,并与水下爆炸经验公式进行对比,吻合良好。将计算得到的爆炸载荷加载到LS-DYNA非线性有限元求解器中,得到固支单层方形钢板的毁伤特性,与试验结果进行对比,证明模型的精确性,表明龙格库塔间断迦辽金-有限元法(Runge-Kutta discontinuous Galerkin-finite element method,RKDG-FEM)耦合计算模型能够精确模拟柱形装药在近场爆炸条件下固支单层方形钢板的响应特性。随后研究了固支单层方形钢板在板厚4 mm、药量5~30 g和板厚3~8 mm、药量20 g的毁伤模式。研究发现,固支单层方形钢板的毁伤模式主要为塑性大变形、花瓣型破口和冲塞型圆形破口等。并拟合了考虑药量、板厚因素的破口尺寸估算公式,可为小当量柱形装药水下近场爆炸单层板的毁伤研究提供参考。

Damage characteristics of fixed single-layer squaresteel plate under near-field underwater explosion of small equivalent column charge

In order to study damage characteristics of fixed single-layer square steel plate under near-field underwater explosion of small equivalent column charge,the high-precision Runge-Kutta discontinuous Galerkin(RKDG)method was used to solve the column charge near-field underwater explosion load,and the solution was compared with that obtained using the empirical formula of underwater explosion,both of them agreed well each other.The calculated explosion load was input into the LS-DYNA nonlinear finite element solver,damage characteristics of the fixed single-layer square steel plate were obtained,they were compared with test results to verify the accuracy of the model.It was shown that the Runge-Kutta discontinuous Galerkin-finite element method(RKDG-FEM)coupled computation model can accurately simulate damage response characteristics of fixed singer-layer square steel plate under column charge near-field underwater explosion.Then,damage modes of the fixed single-layer square steel plate with thickness of 4 mm andcharge of 5-30 g as well thickness of 3-8 mm and ascharge of 20 g werestudied,respectively.The results showed that damage modes of fixed single-layer square steel plate are mainly plastic deformation,petal type break and plug type round break;the break size calculation formula considering charge weight and plate thickness is fitted;the study results can provide a reference for the damage research of single-layer plate under small equivalent column charge near-field underwater explosion.