【摘要】 以典型的船舶舷侧外板上的骨材为研究对象,运用塑性力学理论及数值仿真技术,分析了舷侧外板上骨材在遭受带有球鼻艏的船舶撞击场景下的变形损伤机理。研究中应用LS_DYNA仿真模拟得到舷侧外板上骨材的变形模态和能量耗散结果,在此基础上建立起骨材塑性变形的几何数学模型。运用塑性力学理论,获得舷侧外板上骨材在变形过程中的能量损耗和平均变形阻力的解析计算公式。研究中应用数值仿真结果进行验证。研究得到的舷侧外板骨材变形损伤的解析计算公式,对船舶舷侧抗撞性结构设计和耐撞性能评估都具有一定的参考价值。更多还原

【Abstract】 A theoretical model for analysing the damage mechanism of stiffeners on the outer plating of ship side shell under the scenario of striking by a bulbous bow was proposed. It is based on a study of the progressive process of structural deformation and the plastic-elastic theory. The research stresses on establishing the characteristic deformation mechanism and identifying the major energy dissipation pattern of the stiffeners attached on side shell plating. The analytical expressions of distortion energy of stiffeners and average deformation resistance were derived. The analytical method was verified by numerical simulations using code LS-DYNA. The results of numerical simulations and those by the proposed analytical method match well. The proposed analytical method can be used for the quick assessment of performances of ship side structures during ship collision.更多还原