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Register a new userStudy of fatigue behavior of aluminum alloys 1050A and 2219 under shot penning processes
دراسة سلوك التعب لخليطتي الألمنيوم بعد قذفهما بالكرات المعدنية 2219 و 1050A
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يعد التصليد السطحي بواسطة القذف بالكرات المعدنية (S-P) هو أحد الطرائق المستخدمة بشكل واسع لزيادة صلادة السطوح لخلائط الألمنيوم و التي تؤدي بدورها إلى زيادة مقاومة التعب لتلك الخلائط و ذلك بتوليد إجهادات ضغط متبقية على السطح تعيق نشوء الشق و حركته, و لكن في بعض الحالات يحدث العكس حيث تنخفض مقاومة التعب بسبب تولد شقوق صغيرة على السطح, أجريت الدراسة على نوعين من خلائط الألمنيوم 1050A و 2219, حيث تم الحصول على منحنى ويلر S- N) curve) في حالة التصليد و دونها و لكل من الخلائط أعلاه. كذلك وضعت برامج تحميل(منخفض-عال, عال-منخفض). بينت الدراسة انخفاض عمر التعب بنسبة (% 23 ) و ذلك للخليطة 1050A بسبب حدوث خشونة سطحية تؤدي إلى تكون إجهادات موضوعية عالية تساعد في نشوء الشقوق و تقدمها. أما الخليطة 2219 فقد ازداد عمر التعب لها بنسبة (38%) بسبب حدوث إجهادات ضغطية متبقية تعيق حركة الشقوق.
The surface hardening by shot peening (S-P) is one of the processes used to increase the hardness of aluminum alloys surface. This step tends to increase of the fatigue strength for this alloy because of the creation of compressive residual surface stress layer, which resists the initiation and propagation of cracks. But in some cases, the opposite of this effect occurs, the fatigue strength decreases because of the initiation of surface micro cracks. The influence of this process on the fatigue strength of two aluminum alloys 1050A and 2219 was investigated. (S- N) curves are determined for two surface conditions produced by shot peening and uppeening. As well as the alloys were studied under loading programme low-high & high-low. This paper deduced that the fatigue life of aluminum alloy 1050A was reduced by a percentage of (23%) because shot peening caused high surface roughness, and consequently high local stress, but the fatigue life of aluminum alloy 2219 was increased by about (38%) because the shot peening caused the creation of compressive residual stresses.
References used
Hatamleh.O "Laser and shot peening effects on fatigue crack growth in friction stir welded 7075 – T7351 aluminum alloy joints". International journal of fatigue, Vol,29. 2007
Masaki. Kiyotaka "Influence of shot peening treatment on high – cycle fatigue properties of degassing processed AC4CH aluminum alloy". Journal of the society of materials science, japan. 2005
Campbell.J "Effects of shot peening processing on the fatigue behavior of three aluminum alloys and Ti – Al – 4V". National Technical information service, 2001
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