水下近场非接触爆炸载荷作用下加筋板毁伤变形的数值仿真研究

Numerical simulation research of plate with stiffeners subjected to a near field non-contact underwater explosion

采用高动态非线性有限元程序MSC.Dytran对复杂加筋板结构在水下爆炸载荷下的动态响应和变形模式进行了仿真分析和模型试验,建立了复杂加筋板架结构水下爆炸作用下动态响应的有限元计算方法。研究了加筋板在水下爆炸载荷下的不同毁伤形式,并利用有限元程序对复杂毁伤形式进行了瞬态毁伤过程分析,认为一定药量近距离爆炸时局部破坏要先于整体破坏。

The structure of stiffened plates is the common frame in the hull. In order to study the dy- namical plastic responses of big-size-reinforced stiffened plates structure under underwater explosion load, the FEM code MSC. Dytran was used to discuss the problem. And meanwhile, the model was used in experiments for validation. A modified FEM numerical method was presented to analyze its dynamic plastic responses of big-size-reinforced stiffened plates under underwater explosion load. The different damage forms of underwater explosion load were studied, and the FEM code MSC. Dytran was used to analyze the winking damage process of complex damage forms. The local destruction was considered to be earlier than the whole one when certain detonator exploded at close range.