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Predictions of Life and Damage Mechanisms During Creep-Fatigue

机译：蠕变 - 疲劳过程中的寿命预测和损伤机制

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In order to accurately assess the lifetime of components subjected to combined creep and fatigue loading, it is important to understand the damage processes occuring and whether they interact or not. For several years, at Bristol we have been examining the creep-fatigue properties of a 1 Cr Mo V steel tested at 565 /degree/C, and extensive data, both from the mechanical tests and the subsequent metallographic analysis, have been generated. /(sup 1-4)/ The aim of the work has been to obtain accurate lifetime predictions for the creep-fatigue specimens through an understanding of the physical damage processes. This approach has led to the evolution of new and more accurate predictive methods. /sup (5,6)/ In addition, the mechanistic understanding of damage processes may be used to rationalize the effects of different types of cyclichold tests; this aspect of the work is discussed in this note. Firstly, the damage processes identified in unconstrained creep tests are outlined, and this is followed by an extension of these models to suit constrained (strain limited) cyclichold test conditions. It will be shown that the strain limiting aspect of the cyclic tests is very important; in contrast, the type of dwell introduced (i.e. constant load or constant strain ) is arbitrary, since the creep rate alone can be used to determine the damage mechanisms occuring.

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