考虑材料动态非线性影响的VLCC搁浅性能研究

对船舶搁浅相关冲击问题进行数值仿真计算时,合理可靠的材料输入是保证仿真结果准确性的基础。开展了船用低碳钢材料的准静态拉伸和高速拉伸试验,以试验结果为基础,通过相关计算及校准研究,考虑材料硬化、失效应变以及应变率敏感性,得到满足材料动态非线性要求的仿真材料输入方法及参数。在此基础上,利用非线性有限元软件ABAQUS对VLCC舱段结构搁浅触礁事故进行仿真计算,从损伤变形、搁浅载荷以及搁浅过程中的能量吸收情况等方面分析船体结构的搁浅性能。该研究成果可为大型结构冲击问题数值仿真中的材料非线性输入提供参考和依据。

A study on the grounding performance of VLCC considering the influence of material dynamic nonlinearity

Reasonable and reliable material inputs are essential to obtaining the accurate simulation results for some impact problems such as ship grounding. In this paper,quasi-static and high speed tensile tests have been conducted to obtain the static and dynamic mechanical properties of typical marine mild steel. Considering the plastic strain hardening,fracture strain and strain rate sensitivity,material nonlinearities for simulation inputs have been acquired through related benchmark studies. On this basis,the simulation of VLCC grounding accident has been carried out using the finite element software ABAQUS. The grounding performance of hull structures has been analyzed through damage deformation,grounding force,and energy absorption. The results provide reference and bases for the material nonlinearity inputs in numerical simulation of ship collision and grounding.