CAJ | 학술논문

变幅载荷作用下的疲劳裂纹扩展情况更能够反映海洋结构物真实的疲劳行为。已有的关于载荷次序问题的研究中，多是考虑在定幅值载荷历程中加入单个或多个超载/低载，或加入块状超载/低载，使变幅载荷序列得到简化。文章则主要研究更接近真实情况的随机载荷序列，超载、低载随机相互作用下的载荷次序效应对海洋结构疲劳裂纹扩展率的影响。首先介绍了载荷次序效应问题的研究现状和基本结论，总结了考虑载荷次序效应的变幅载荷作用下疲劳裂纹扩展模型，然后简单介绍了文中应用的疲劳寿命预报统一方法（Unified Fatigue Life Prediction，UFLP）的基本思想，最后给出了随机载荷作用下，应用UFLP法计算海洋结构物疲劳裂纹扩展的示例。
변폭재하작용하적피로렬문확전정황경능구반영해양결구물진실적피로행위。이유적관우재하차서문제적연구중，다시고필재정폭치재하역정중가입단개혹다개초재/저재，혹가입괴상초재/저재，사변폭재하서렬득도간화。문장칙주요연구경접근진실정황적수궤재하서렬，초재、저재수궤상호작용하적재하차서효응대해양결구피로렬문확전솔적영향。수선개소료재하차서효응문제적연구현상화기본결론，총결료고필재하차서효응적변폭재하작용하피로렬문확전모형，연후간단개소료문중응용적피로수명예보통일방법（Unified Fatigue Life Prediction，UFLP）적기본사상，최후급출료수궤재하작용하，응용UFLP법계산해양결구물피로렬문확전적시례。
Fatigue crack propagation under variable amplitude loading reflects more realistic fatigue action of marine structures. In the existing researches of load sequence effect, most of the researchers simplify the issue by adding single or multiple overload/underload or loading block to constant amplitude load series. In this paper, random load sequence which is more close to real fatigue load is studied, considering load in-teraction effect on fatigue crack propagation of marine structures. The state of load sequence effect is in-troduced, and some popular fatigue crack propagation models under variable amplitude loading are sum-marized. The basic idea of the unified fatigue life prediction (UFLP) method is presented. Finally, marine structure’s fatigue crack propagation under random variable amplitude loading is demonstrated.