CAJ | 학술논문

裂纹在循环压缩载荷下的扩展已经被试验证实，但是对于压缩疲劳特别是多轴压缩由于难以观测因而无法准确描述，另外裂纹面载压缩载荷下出现裂纹闭合也增加了问题的复杂性。潜水器结构的大部分区域是处于压应力状态，横舱壁水平大梁端部结构的T型节点正好位于板壳和横舱壁交汇处，承受着复杂的双轴压-压疲劳循环载荷。该文通过对5组T型节点的双轴疲劳试验研究，得到了试件在压—压载荷下的裂纹萌生和扩展规律。和单轴压疲劳不同，双轴压—压疲劳伴随有短裂纹的合并行为、主导有效短裂纹行为和裂纹干涉效应。
렬문재순배압축재하하적확전이경피시험증실，단시대우압축피로특별시다축압축유우난이관측인이무법준학묘술，령외렬문면재압축재하하출현렬문폐합야증가료문제적복잡성。잠수기결구적대부분구역시처우압응력상태，횡창벽수평대량단부결구적T형절점정호위우판각화횡창벽교회처，승수착복잡적쌍축압-압피로순배재하。해문통과대5조T형절점적쌍축피로시험연구，득도료시건재압—압재하하적렬문맹생화확전규률。화단축압피로불동，쌍축압—압피로반수유단렬문적합병행위、주도유효단렬문행위화렬문간섭효응。
It was demonstrated by experiments that crack can grow under cyclic compressive loading. However, this kind of crack growth phenomena is difficult to be observed and described accurately by mathematical methods, especially for multiaxial fatigue. In addition, cracks may close under com-pressive loading, which also increases the complexity of the problem. Submersibles have many com-ponents which were designed to be compressively stressed. As a typical research object of compres-sive fatigue, the end structure of horizontal girder (T junction) suffers the complex cyclic compres-sive-compressive loading. This paper described and summarized multiaxial compressive fatigue crack initiation and propagation characteristics through several biaxial fatigue tests. And concepts such as Effective Short Fatigue Cracks (ESFCs) and Dominant Effective Short Fatigue Crack (DESFC) were introduced to explain the interaction of short fatigue cracks. Unlike uniaxial compressive fatigue, mul-tiaxial compressive-compressive fatigue has the hybrid characteristics of multi-point crack initiat-ing, short crack group growth behavior and long crack propagating behavior.