This paper presents a numeric study for an offshore platform deck that encounters potential dropped container impacts in the North Sea. The commercial Abaqus Explicit code was used. Significant plastic deformation was observed due to the high impact energy. A correct tensile fracture model that simulates the steel ductile failure under complicated stress states becomes crucial in such analysis. The material test data are normally very limited in design, which makes it difficult to calibrate the failure criterion. The critical failure strain provided by rules/codes (NORSOK and DNV GL) is not explicitly based on the stress states. This paper presents two simple approaches to extend the failure strain to a wider triaxiality range. Validation has been performed for the two failure criteria that depend on stress states (based on the RTCL and first principal plastic strain). The criterion based on the first principal plastic strain is shown to give the most conservative results. The RTCL-based interpretation shows good agreement under different mesh sizes. Several practical issues during the analysis are also addressed. Both criteria have been applied in the case study. Minor differences are observed from the obtained results of the dissipated energy and impact force. However, the local failure patterns are quite different, to which further attention shall be paid.

本文提供了对海上平台甲板的数值研究，该平台在北海遇到了可能掉落的集装箱撞击。使用了商业Abaqus显式代码。由于高冲击能，观察到明显的塑性变形。在这种分析中，模拟在复杂应力状态下钢的延性破坏的正确拉伸断裂模型变得至关重要。材料测试数据通常在设计上非常有限，这使得很难校准失效标准。规则/代码（NORSOK和DNV GL）提供的关键失效应变未明确基于应力状态。本文提出了两种简单的方法来将破坏应变扩展到更宽的三轴性范围。已经根据应力状态（基于RTCL和第一个主要塑性应变）对两个失效准则进行了验证。结果表明，基于第一个主塑性应变的标准给出了最保守的结果。基于RTCL的解释在不同的网格尺寸下显示出良好的一致性。分析中的一些实际问题也得到解决。案例研究中都应用了这两个标准。从耗散的能量和冲击力的获得结果中观察到微小差异。但是，局部故障模式是完全不同的，应进一步注意。分析中的一些实际问题也得到解决。案例研究中都应用了这两个标准。从耗散的能量和冲击力的获得结果中观察到微小差异。但是，局部故障模式是完全不同的，应进一步注意。分析中的一些实际问题也得到解决。案例研究中都应用了这两个标准。从耗散的能量和冲击力的获得结果中观察到微小差异。但是，局部故障模式是完全不同的，应进一步注意。