落物二次撞击作用下水下防护设施损伤特性  

Damage Characteristics of Underwater Protection Facilities under Second Impact of Falling Objects

作　　者：沈晓鹏 李书兆 朱春丽 李明鎏 孙瑜萌 徐万海[2] SHEN Xiaopeng;LI Shuzhao;ZHU Chunli;LI Mingliu;SUN Yumeng;XU Wanhai(CNO0C Research Institute,Beijing 100028,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《船舶工程》2025年第2期156-161,共6页Ship Engineering

基　　金：国家自然科学基金项目(51979163)。

摘　　要：[目的]为探究落物二次撞击作用下水下防护设施的损伤特性,重点评估初始损伤、撞击位置、速度及质量对结构防护性能的影响。[方法]基于有限元方法建立水下防护设施数值模型,并通过落锚碰撞试验验证模型的准确性,进而系统分析二次撞击位置、速度及质量对撞击应力和等效塑性应变的影响规律。[结果]结果表明,二次撞击位置与初始损伤的距离越远,初始损伤的负面影响越小;当撞击速度和质量增大时,最大撞击应力与等效塑性应变显著增加,且初始损伤导致二次撞击等效塑性应变的最大增幅达60%,尤其在邻近损伤区域的影响更为显著。[结论]水下防护设施的二次撞击损伤由初始损伤位置与撞击参数的协同作用主导,工程设计中须优先考虑邻近损伤区域的多次撞击极端工况,以提升防护结构的可靠性。[Purpose]To investigate the damage characteristics of underwater protection facilities under secondary impacts from falling objects,with a focus on evaluating the effects of initial damage,impact location,velocity,and mass on structural protection performance.[Method]A numerical model of underwater protection facilities is established using the finite element method and validated by anchor drop impact tests.The method also includes a systematic analysis of the influence of secondary impact parameters on impact stress and equivalent plastic strain.[Result]The results demonstrate that the adverse effects of initial damage diminish as the secondary impact location moves farther from the primary damage zone.maximum impact stress and equivalent plastic strain significantly escalate with higher velocity and mass,while initial damage amplifies equivalent plastic strain by up to 60%during secondary impacts,particularly in proximity to the damaged area.[Conclusion]In conclusion,secondary impact damage is governed by the combined effects of initial damage location and impact parameters.Engineering designs should prioritize extreme scenarios of repeated impacts close to the damaged regions to enhance structural reliability.

关 键 词：水下防护设施 二次撞击 撞击损伤 数值模拟 

分 类 号：U671.99[交通运输工程—船舶及航道工程]