为研究装药在箱型钢筋混凝土密闭结构内爆炸时内壁冲击波超压载荷分布情况,利用LS-DYNA对该密闭空间内爆炸进行了数值仿真,给出了测点及特征点的仿真超压曲线,并与试验结果进行了对比。结果表明,爆炸冲击波内壁间的多次反射与叠加是内爆炸的显著特征,装药在长方体(长宽高之比为2:1:1)钢筋混凝土密闭装置中心內爆时,內壁超压最大点为离装药中心最近的点,其次为平行于端面且过装药中心截面的顶点;装药在立方体密闭装置中心內爆时,内壁超压最大点为装置的空腔顶点,其次为正对爆心的点。两平面的交线及三个平面的交点此类区域会使波阵面的汇聚效应增强,正压作用时间延长,比冲量增加。

To study blast loading on the inner wall after the explosion in reinforced concrete box structure, LS-DYNA was used to simulate the internal explosion, the simulated overpressure time history of test points and characteristic points were gained, results were compared with experimental ones. Multiple reflection and superposition between inner walls are the salient features of internal explosion, when charge detonates in the center of rectangular (L: B: H = 2:1:1) one, The points on the inner wall which suffer the maximum overpressure are the nearest points from the explosive center, followed by the vertexes of cross-section across charge center which parallels with the two ends; For the cube one, the points of maximum overpressure on the inner wall are the cavity vertex points, followed by the points right face the explosion center. Areas of intersection of two planes and intersection of three planes will make the clustering effect stronger, positive time longer, and increase the specific impulse.