壳单元和实体单元模拟爆炸荷载作用钢板动力响应的差异性比较

以舰船舱室钢板为研究对象,利用动力分析有限元程序Ls-dyan,分别采用壳单元和实体单元2种建模方式对爆炸荷载作用下钢板的动力响应进行数值模拟研究.对比钢板的应力分布云图、中线上各点最大位移曲线图,发现2种方法计算结果与试验值大致吻合,采用壳单元建模在保证计算结果准确性的前提下可以大大提高计算效率.如何正确地选择单元进行分析是数值模拟很重要的一个环节,通过对壳单元和实体单元计算结果的初步对比,为舰船舱室数值模拟研究如何选取单元提供参考.

Comparision of differentiation with the steel plates' dynamic response subjected to blast loads using shell element and solid element modeling methods

Take the steel plates of warship cabins as research objects, numerical simulation study on the response of the quadrangular steel plates subjected to blast loads is presented by dynamic analysis finite element procedure Ls-dyan3d, us-ing modeling methods of shell element and solid element respectively. Comparing pressure distribution cloud picture and each point of midcourt line miximum displacement curve graph, it can be found that transformation trend of steel plates is similar for different thickness while each point of midcourt line miximum displacement is discriminating. However results from two methods are alike for equal thickness. Meanwhile, it can improve calculative effciency. How to choose which kind of element types correctly to analysis is an important link. Through the preliminary contrast study of calculative results of shell element and solid element, it can provide reference for choosing element type in warship cabins numerical simulation.