CAJ | 학술논문

设计了一种含局部减薄半椭圆缺口的紧凑拉伸试样(ECT),以模拟压力容器接管区结构,并对16MnR钢的ECT试样进行了不同应力比的恒幅低周疲劳裂纹扩展试验.结果表明:ECT试样具有类似压力容器接管区的高应变分布场;低周疲劳裂纹扩展速率与由线积分定义计算的循环J积分,△J在双对数坐标中呈良好线性相关,且回归的材料参数与相同材质的高周疲劳试验获得的Paris常数基本一致.
설계료일충함국부감박반타원결구적긴주랍신시양(ECT),이모의압력용기접관구결구,병대16MnR강적ECT시양진행료불동응력비적항폭저주피로렬문확전시험.결과표명:ECT시양구유유사압력용기접관구적고응변분포장;저주피로렬문확전속솔여유선적분정의계산적순배J적분,△J재쌍대수좌표중정량호선성상관,차회귀적재료삼수여상동재질적고주피로시험획득적Paris상수기본일치.
An especial compact tension (ECT) specimen with locally thinned elliptical notch was designed to simulate the structure at the junction of pressure vessel and nozzle, and the low cycle fatigue (LCF) crack growth in the new specimens of 16MnR steel during different load ratios was investigated. The results show that the characters of the strain distribution in ECT specimen are similar to that of vessel/nozzle junction. The values of cyclic J-integral, △Jj/i calculated from a path independent integral are seen to properly correlate well with LCF crack growth in ECT specimens during constant-amplitude loading, and it may describe LCF crack propagation directly using Paris' constants obtained by high cycle fatigue (HCF) tests.