CAJ | 학술논문

文章结合低周疲劳试验数据，在能量损伤理论、损伤度弹性模量度量法，以及简化的椭圆形裂纹形状扩展模型的基础上提出了一种基于损伤演化的疲劳裂纹扩展寿命简化计算方法。目前疲劳裂纹扩展寿命预测的基础是基于断裂力学的Paris公式，鉴于基于应变-寿命曲线的疲劳损伤演化与基于断裂力学的裂纹扩展本质上的一致性，文章提出的简化计算方法不但具有明确的物理意义，也对评估裂纹扩展寿命提出了一种基于损伤力学的新视角。同时，文中也对某船用高强度钢进行了算例计算和分析。结果表明，该方法计算过程便捷，在船舶工程结构寿命评估方面存在一定的实用价值。
문장결합저주피로시험수거，재능량손상이론、손상도탄성모량도량법，이급간화적타원형렬문형상확전모형적기출상제출료일충기우손상연화적피로렬문확전수명간화계산방법。목전피로렬문확전수명예측적기출시기우단렬역학적Paris공식，감우기우응변-수명곡선적피로손상연화여기우단렬역학적렬문확전본질상적일치성，문장제출적간화계산방법불단구유명학적물리의의，야대평고렬문확전수명제출료일충기우손상역학적신시각。동시，문중야대모선용고강도강진행료산례계산화분석。결과표명，해방법계산과정편첩，재선박공정결구수명평고방면존재일정적실용개치。
A simplified calculation method of crack propagation life(CPL) based on damage evolution was presented by studying on the theory of energy damage and fatigue damage in elasticity modulus and the simplified expanding model of the elliptic crack. The calculation of CPL by building on Paris formula based on fracture mechanics was the foundation method for the moment. The conception of the method in this paper was clear and novel because of the essence of fatigue damage based on Δε-Ν curve and Paris for-mula was coincident. The results of the example show that the method of this paper was valuable to the e-valuation of the ship structure fatigue life.