Abstract Many manufacturing processes can induce residual stresses in produced components for high-temperature application. Residual stresses, combined with the primary mechanical stresses, play an important role in structural integrity assessments of high-temperature components. In this paper the elastic and elastic-plastic creep behaviour of mechanically loaded shallow cracked SENB specimen in the presence of residual stress has been analyzed. The transient crack tip parameter under creep conditions, C(t), has been numerically determined at different primary mechanical stress and residual stress levels. The analysis was performed for general material properties where different plastic and creep stress exponents were systematically varied. Based on the performed analyzes, the expressions for relaxation curves of C(t) for the considered elastic creep and elastic plastic creep cases are proposed. These expressions show good agreement with the results of the numerical analysis conducted for the arbitrarily selected input data, which gives confidence in their reliable application for estimating the C(t) values of shallow cracked SENB speciemens.

中文翻译：

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残余应力对SENB试件瞬态蠕变影响的数值分析

摘要 许多制造过程会在生产的高温应用部件中引起残余应力。残余应力与主要机械应力相结合，在高温部件的结构完整性评估中发挥着重要作用。在本文中，分析了机械加载的浅裂纹 SENB 试样在残余应力存在下的弹塑性蠕变行为。蠕变条件下的瞬态裂纹尖端参数 C(t) 已在不同的主要机械应力和残余应力水平下通过数值确定。对一般材料特性进行了分析，其中系统地改变了不同的塑性和蠕变应力指数。根据所进行的分析，针对所考虑的弹性蠕变和弹塑性蠕变情况，提出了 C(t) 松弛曲线的表达式。这些表达式与对任意选择的输入数据进行的数值分析的结果显示出良好的一致性，这使人们对其在估计浅裂纹 SENB 样品的 C(t) 值方面的可靠应用充满信心。