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本文研究了缺口对GH33A合金在高温低周疲劳及劳疲/蠕变交互作用下的力学行为。结果表明:缺口使GH33A合金低周疲劳寿命缩短,其缩短的程度随缺口尖锐程度的增加而加剧。低周疲劳高应力时,保载时间的作用引入了蠕变分量,促使低周疲劳寿命Nf降低。在低周疲劳固定最大应力,改变最小应力而造成蠕变/疲劳交互作用情况下,其断裂寿命在一定条件下具有最大值,断裂机制可由纯疲劳断裂逐步转化为纯蠕变断裂,其程度主要决定于蠕变应力(或疲劳应力)分量所占比例的大小。
In this paper, the mechanical behavior of GH33A alloy under the low temperature fatigue and fatigue / creep interaction was studied. The results show that the notch shortens the low cycle fatigue life of GH33A alloy and its shortening is aggravated by the sharp increase of the notch. Low cycle fatigue High stress, the role of loading time introduced creep components, prompting low cycle fatigue life Nf reduced. Under the condition of the maximum cyclic stress fixed and the minimum stress changing and the creep / fatigue interaction caused, the fracture life has the maximum value under certain conditions. The fracture mechanism can be gradually transformed from pure fatigue fracture to pure creep fracture. Determined by the creep stress (or fatigue stress) component of the proportion of the size.