论文信息 - On the scatter in creep rupture times

On the scatter in creep rupture times

We report here the results of three series of replicated creep rupture experiments carried out on copper bicrystals. The intent of this study is to investigate the scatter in creep rupture times in order to determine whether creep rupture may be viewed as an essentially deterministic phenomenon or if it contains intrinsic probabilistic features. The use of bicrystals is advantageous in such an investigation, because they are much less sensitive to the effects of loading eccentricity than poly crystalline specimens. The results indicate that where failure is due to a mixed cavitation/ductile rupture mode, the scatter in the failure times may be accounted for entirely by the effects of random variations in the experimental conditions. However when the failure mode is essentially intergranular creep cavitation, the scatter in the failure times is substantially greater than can be explained by the effects of experimental variability. This leads to the conclusion that under these conditions, the creep rupture phenomenon contains intrinsic probabilistic features.

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