Abstract Ship structures can experience damages although they are initially designed with high safety factors. These damages can be caused by many reasons such as collisions, groundings, explosions, corrosion, fatigue, overloading or extreme conditions. Brittle damages can occur on the ship structures in some special conditions such as low-temperature, high-loading rate, multi-axial stress constraint, or low weldability of steel. In this study, progressive brittle damages on a ship structure subjected to different loading conditions are predicted. A novel peridynamic method based on a recently developed peridynamic shell model is presented to evaluate the structural strength during the damage evolution process for the first time in the literature. First, longitudinal strength (bending moment) of a ship structure is numerically calculated during damage propagations. The maximum longitudinal strength of the intact ship is verified with the experimental result. Next, the simulations are further extended to investigate the ship structure with initial damage, i.e. rectangular cut-out at the bottom. The longitudinal strength for an intact ship and a ship with different sizes of cut-outs are also compared. Finally, torsional strength during the damage propagation process for a ship structure with a cut-out is also presented.

中文翻译：

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利用近场动力学研究脆性裂纹扩展对船舶结构强度的影响

摘要 船舶结构虽然最初设计时具有很高的安全系数，但仍可能遭受损坏。这些损坏可能由多种原因造成，例如碰撞、接地、爆炸、腐蚀、疲劳、超载或极端条件。船舶结构在低温、高载荷率、多轴应力约束或钢材焊接性低等特殊条件下会发生脆性破坏。在这项研究中，预测了船舶结构在不同载荷条件下的渐进性脆性损坏。在文献中首次提出了一种基于最近开发的近场动力学壳模型的新近场动力学方法来评估损伤演化过程中的结构强度。第一的，船舶结构的纵向强度（弯矩）在损伤传播过程中进行数值计算。试验结果验证了完整船的最大纵向强度。接下来，进一步扩展模拟以研究具有初始损坏的船舶结构，即底部的矩形切口。还比较了完整船和具有不同尺寸切口的船的纵向强度。最后，还介绍了带有切口的船舶结构在损伤传播过程中的扭转强度。还比较了完整船和具有不同尺寸切口的船的纵向强度。最后，还介绍了带切口的船舶结构在损伤传播过程中的扭转强度。还比较了完整船和具有不同尺寸切口的船的纵向强度。最后，还介绍了带切口的船舶结构在损伤传播过程中的扭转强度。