CAJ | 학술논문

海洋工程焊接结构形式复杂且遭受随机波浪载荷作用，焊接接头多数处于多轴疲劳状态，而目前工程上主要采用基于单轴疲劳理论和试验的方法预测结构的疲劳寿命。为了提高焊接结构疲劳寿命预测的准确性，文章提出了一种评估焊接接头疲劳强度的新型结构应力法，并与临界面理论相结合，能够用于实际焊接结构的多轴疲劳寿命预测。通过对国际上已公开发表的疲劳试验数据进行有限元分析，证明了文中提出的结构应力法比传统的热点应力法具有更高的精度，以及该方法应用于焊接结构多轴疲劳寿命预测的可行性。最后，应用该方法对一个T型管节点进行了多轴疲劳寿命计算。
해양공정한접결구형식복잡차조수수궤파랑재하작용，한접접두다수처우다축피로상태，이목전공정상주요채용기우단축피로이론화시험적방법예측결구적피로수명。위료제고한접결구피로수명예측적준학성，문장제출료일충평고한접접두피로강도적신형결구응역법，병여림계면이론상결합，능구용우실제한접결구적다축피로수명예측。통과대국제상이공개발표적피로시험수거진행유한원분석，증명료문중제출적결구응역법비전통적열점응역법구유경고적정도，이급해방법응용우한접결구다축피로수명예측적가행성。최후，응용해방법대일개T형관절점진행료다축피로수명계산。
Welded structures in ocean engineering are complex and subjected to random wave loads, which results in multiaxial fatigue state for most welded joints. However, methods used to estimate fatigue life of welded structures at present are mainly based on uniaxial fatigue theory and tests. To improve accuracy of fatigue life estimation for welded joints, a new structural stress approach is proposed. In combination with the critical plane theory, the new structural stress approach can be used to estimate the multiaxial fatigue life for real welded structures. By numerically analyzing a series of published fatigue data, the new struc-tural stress approach proves more accurate than the traditional hot spot stress approach, and feasible for the multiaxial fatigue life estimation. Finally, the proposed approach is used to calculate the multiaxial fatigue life of a tubular T-joint.