CAJ | 학술논문

用有限元法计算了异种耐热钢接头邻近焊缝界面低强度材料区的蠕变应变分布，建立了蠕变拘束区(CRZ)应力三轴度(σav/σ)与蠕变应变速率的比值(εw/εb)之间的数学关系模型，并通过蠕变断裂试验证明了数学模型的正确性。理论分析和试验结果表明，焊缝界面低强度材料蠕变拘束区的应力三轴度是接头发生低塑性蠕变失效的主要力学因素。
용유한원법계산료이충내열강접두린근한봉계면저강도재료구적연변응변분포，건립료연변구속구(CRZ)응력삼축도(σav/σ)여연변응변속솔적비치(εw/εb)지간적수학관계모형，병통과연변단렬시험증명료수학모형적정학성。이론분석화시험결과표명，한봉계면저강도재료연변구속구적응력삼축도시접두발생저소성연변실효적주요역학인소。
The creep strain distribution in the low strength material adjacent to weld interface of dissimilar heat-resistant steel welded joint is investigated by finite element method,and the mathematical model between the stress triaxiality (σav/σ)and the ratio of creep strain rate(εw/εb)is established.It was shown from the analytical result that the stress triaxiality in the creep restraint zone(CRZ)of low strength material adjacent to the inter face is a major mechanical factor of low-ductile creep fracture for the welded joint.The theoreticl analysis agrees with the creep fracture test results.