高温喷丸复合处理下AA2024-T4和AA2024-T361的疲劳变载荷

Allawi H. Alwin, H. Ksibi, Z. Driss, H. J. Alalkawi
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引用次数: 1

摘要

变疲劳载荷(VL)是关系到飞机安全的重要问题。事实上,铝合金零件总是这种类型的热机械改变的主题。本研究考察了正常操作条件下的效果(VL)。研究了高温(HT)和喷丸强化(SP)复合处理对(AA2024-T4和AA2024-T361)合金疲劳变载荷(VL)的影响。研究了250 ~ 350MPa载荷下不同加载周期组合下的疲劳情况。试验结果与Miner法则进行了比较。结果表明,低至高应力序列下试件的疲劳寿命高于高至低应力序列下试件的疲劳寿命。这突出了(SP)的有利作用,使得Miner法则预测的疲劳寿命是安全的,但不经济。我们得出结论,SP下的合金提高了250℃下的可变疲劳寿命。事实上,考虑到加载顺序的相互作用,高温和表面处理(如SP)的相互作用对基于此类合金的疲劳预测是非常重要的。
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Fatigue Variable Loading Under Combined High Temperature and Shot Peening Treatment for AA2024-T4 and AA2024-T361
Abstract The variable fatigue loading (VL) is an important issue for aircraft safety. Indeed, aluminium alloy parts are always the subject of this type of thermo-mechanical alterations. This study examined the effect (VL) under normal operating conditions. We investigated the effect of fatigue variable loading (VL) under combined high temperature (HT) and shot peening (SP) treatment for (AA2024-T4 and AA2024-T361). Fatigue under loading from 250 to 350MPa with various combinations of loading cycles is presented. The experimental fatigue life results were compared to Miner’s rule. The comparison shows that the fatigue life of tested specimens during the low to high stress sequences is higher than that of the (high to low) ones. This highlights the beneficial effect of (SP) which made the fatigue life predicted by Miner rule safe but not economical. We conclude that considered alloys under SP improves the variable fatigue life under 250°C. In fact, taking into account the interaction effects of loading sequences, those due to high temperature and surface treatment such as (SP) is very important for fatigue prediction based on such alloys.
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