一种考虑钢材硬化各向同性的失效准则在船舶碰撞数值仿真中的应用

Application of a BWH-based fracture failure criterion of steel material in numerical simulation of ship collision scenarios

随着计算机技术的迅速发展,采用有限元数值仿真技术对船舶碰撞与搁浅场景进行研究,已经可以提供较为可靠准确的模拟结果,并且具有节省时间、人力与成本的优势;但是,如何合理定义钢板材料的断裂失效准则,是有限元技术中一个十分重要的问题。基于BWH失效准则理论假设,推导出一套适用于考虑硬化的各向同性材料失效准则公式,并利用LS-DYNA程序进行二次开发编程,将此准则嵌入LS-DYNA程序中;之后,利用更新的LS-DYNA程序,以一个船舶搁浅模型试验为例,进行有限元数值仿真计算。通过与试验结果对比,验证所提出的钢板材料失效准则的适用性。

With the rapid development of computer technology,finite element numerical simulation technology is used to study ship collision and grounding scenarios to provide more reliable and accurate simulation results,it has the advantages of saving time,manpower and cost.How to reasonably define the fracture failure criterion of steel plates is a very important problem in finite element technology.Here,based on the BWH failure criterion,a set of formulas for the failure criterion of isotropic materials considering hardening was proposed and coded using the LS-DYNA program as its secondary development.The code of this new criterion was embedded in the LS-DYNA program.Then,using the updated LS-DYNA program,a finite element numerical simulation was performed for an example of ship-grounding model test.Comparing the numerical simulation results with those of the model test,the applicability of the proposed steel plate failure criterion was validated.