多层混凝土介质内爆炸相似性分析

Analysis of Similarity Law of Explosion in Multi-layer Concrete Medium

为了研究多层混凝土介质内爆炸相似律,基于量纲分析法建立了多层混凝土介质内爆炸相似模型。利用有限元分析软件LS-DYNA分析了装药深度和缩尺比例对原型和缩比模型毁伤形态及毁伤效应参量相似性的影响,并以梯恩梯和含铝炸药进行原型和缩尺比例为1/2的缩比模型内爆炸毁伤相似性试验。结果表明:不同装药深度下的原型与缩比模型的毁伤形态相同,毁伤效应参量符合相似规律;靶板边界约束相同时,含铝炸药在原型和缩尺比例为1/2的缩比模型内爆炸毁伤具有相似性,缩比毁伤效应参量归一化后与原型的偏差在8%以内;随着缩尺比例的减小,毁伤效应参量与原型的偏离程度增大,可选用适当缩尺比例的缩比模型试验结果预测原型的内爆炸毁伤效应。

A similarity model of internal explosion in multilayer concrete is established based on dimensional analysis for researching the similarity law of explosion in multilayer concrete. The influences of charge depth and scale ratio on the similarity of damage pattern and damage parameters of prototype and scale model were analyzed by LS-DYNA code. The similarity tests of internal explosion damages of TNT and aluminized explosive were carried out in the prototype and the scale model with scale ratio of 1/2.The results show that the damage patterns of prototype and scale model are the same at different charge depths. When the boundary constraint of a target is the same,the damage of aluminized explosive is similar in the prototype and the 1/2 reduced-scale model. After the normalization of scaled damage parameters,the deviation of the prototype is less than 8%. The deviation degree between the damage parameters of reduced-scale model and prototype is increased with the decrease in scale ratio. The damage effect of internal explosion of the prototype can be predicted by using the test results of appropriate scale ratio model.