Experimental Study of Biaxial Creep Damage for Type 304 Stainless Steel
Experimental Study of Biaxial Creep Damage for Type 304 Stainless Steel
复制标题
304不锈钢双向蠕变损伤实验研究
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Tokura
中科院分区：
文献类型：
--
作者：
M. Sakane;H. Tokura
研究了304不锈钢在923k高温下的双轴蠕变损伤。采用十字形试样进行了双轴拉伸蠕变试验，探讨了应力双轴性对断裂寿命和蠕变空隙的影响。Mises等效应力和基于裂纹张开位移的等效应力是评估双轴蠕变损伤的合适参数。Huddleston提出的等效应力将双轴蠕变损伤高估了两倍以上。应力双轴性对空洞晶界的取向和参数a的临界值几乎没有影响。交替加载方向试验显著分散了双轴蠕变损伤，导致蠕变寿命增大。
This paper studies the biaxial creep damage of type 304 stainless steel at 923 K. Biaxial tension creep tests were carried out using cruciform specimens and the effect of stress biaxiality on rupture lifetime and creep voiding was discussed. Mises equivalent stress and the equivalent stress based on crack opening displacement were a suitable parameter to assess the biaxial creep damage. The equivalent stress proposed by Huddleston overestimated the biaxial creep damage by more than a factor of two. Stress biaxiality had almost no influence on the orientation of voided grain boundaries and the critical value ofparameter A. Tests of alternative loading direction significantly dispersed the biaxial creep damage resulting in larger creep lifetime.