سلوك الكلال التآكلي لسبيكة الألمنيوم 1100-H12 تحت أزمان مختلفة للقذف بالكريات
Corrosion-Fatigue Behavior of 1100-H12 Al Alloy under Different Shot Peening Times
- الباحث
- زينب عزيز بطي
- المشرف
- حسين جاسم محمد العلكاوي - عامر حميد مجيد
- الجامعة
- الجامعة المستنصرية
- الكلية / القسم
- الهندسة / هندسة المواد
- الشهادة
- ماجستير
- السنة
- 2014
- لغة الرسالة
- انكليزي
- الكلمات المفتاحية
- Corrosion fatigue;Aluminum alloy 1100-H12;Shot peening;Cumulative damage
Abstract
Corrosion is known to significantly reduce the life and strength of metals, especially of light metals. Corrosion fatigue occurs by the combined actions of cyclic loading and a corrosive environment . The interaction of corrosion and fatigue of aluminum alloys is a major issue in the practice life assessment of aircrafts and in the management of aging air fleets .This study examined the effect of shot peening on cumulative corrosion fatigue life of aluminum alloy 1100-H12 under reversed fatigue loading with stress ratio R= -1 and room temperature (RT).The experimental results indicated that shot peening has a significant improvement to increase the corrosion fatigue life .In case of unpeened specimens ,the constant S-N fatigue strength was reduced by 41% due to submerge the specimens in 3.5% NaCl corrosive solution for 71 days. The shot peening treatment improved the cumulative corrosion fatigue life by a factor ranging from (1.27 - 2). A non linear damage model was proposed to predict the cumulative corrosion fatigue life as in the following equations: For (low to high) test program D= For (high to low ) test program D= The prediction of fatigue lives using the proposed model showed safe and satisfactory estimations of cumulative corrosion fatigue with and without shot peening . While Miner rule was not always suitable for life prediction under cumulative fatigue damage.
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