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首页> 外文期刊>材料 >Influence of Stress Change on the Fatigue Behavior and Fatigue Life of Aluminum Oxide-Dispersion-Strengthening Copper Alloy at Room Temperature and 350 deg C
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Influence of Stress Change on the Fatigue Behavior and Fatigue Life of Aluminum Oxide-Dispersion-Strengthening Copper Alloy at Room Temperature and 350 deg C

机译：压力变化对室温下氧化铝分散加强铜合金疲劳行为和疲劳寿命的影响和350℃

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摘要

In order to investigate the influence of stress change on the fatigue behavior and fatigue life of an aluminum oxide-dispersion-strengthening copper alloy at elevated temperature, rotating bending fatigue tests were carried out under two-step loading at room temperature and 350 deg C. Both of static strength and fatigue strength decreased at 350 deg C. However, at the same relative stress sigma_a/sigma_B, fatigue life was longer at 350 deg C than at room temperature. Although the cumulative ratios SIGMA (N/N_f) were nearly unity for both the low to high and the high to low block loadings at room temperature, Miner's rule did not hold at 350 deg C. These results were related to the stress dependence on the log l-N/N_f relation. That is, the crack length initiated at the same N/N_f was larger in higher stress level at 350 deg C, whereas there was no stress dependence in the relation at room temperature. The stress dependence on the relation at 350 deg C was caused by the suppression of crack initiation due to the surface oxidation.
机译：为了研究升高温度下氧化铝 - 分散加强铜合金的疲劳性能和疲劳寿命的应力变化的影响，在室温下的两步加载下旋转弯曲疲劳试验和350℃。静态强度和疲劳强度的两种效率在350℃下降低。然而，在相同的相对应力Sigma_a / sigma_b处，疲劳寿命比室温在350℃下更长。虽然累积比率Sigma（N / N_F）对于室温下的低到高块和低阻挡率均匀，但矿工的规则在350℃下没有持有。这些结果与压力依赖性有关日志ln / n_f关系。也就是说，在350℃下，在相同的N / N_F下引发的裂缝长度较高，而在室温下没有应力依赖性。对350℃关系对关系的应力依赖性是由于表面氧化引起的裂纹引发引起的。

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