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دانلود رایگان مقاله الزویر درباره وضع فرسودگى محل اصطکاک جوش آلومینیوم 5754-O و 6111-T4 در نمونه های رويهم افتاده برشی (کلیک کنید)
توضیحات :
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عنوان مقاله :
Fatigue behavior of aluminum 5754-O and 6111-T4 spot friction welds in lap-shear specimens
ترجمه فارسی عنوان :
وضع فرسودگى محل اصطکاک جوش های 5754-O و 6111-T4 آلومینیوم در نمونه های رويهم افتاده برشی
سال انتشار : 2008
متعلق به مجله یا ژورنال : مجله بین المللی فرسودگى (International Journal of Fatigue)
فرمت: PDF
تعداد صفحات: 16
شماره پروژه: 5002
کلمات کلیدی :
Spot friction weld, Friction stir spot weld, Failure mode, Fatigue life, Kinked crack, Structural stress
اصطکاک محل جوش، اصطکاک حرکتی محل جوش، حالت شکست، طول عمر فرسودگی، شکاف پیچ خورده، تنش ساختاری
چکیده مقاله فرسودگى محل اصطکاک جوش آلومینیوم :
Abstract
Fatigue behavior of aluminum 5754-O and 6111-T4 spot friction welds in lap-shear specimens is investigated based on experimental observations and two fatigue life estimation models. Optical micrographs of the 5754 and 6111 welds made by a concave tool and a flat tool, respectively, before and after failure under quasi-static and cyclic loading conditions are examined. The micrographs show that the failure modes of the 5754 and 6111 welds under quasi-static and cyclic loading conditions are quite different. Under quasi-static loading conditions, both types of welds mainly fail from the nearly flat fracture surface through the nugget. Under low-cycle loading conditions, both types of welds mainly fail from the kinked crack through the upper sheet thickness and the fracture surface through the nugget. Under high-cycle loading conditions, both types of welds mainly fail from the kinked cracks through the upper and lower sheet thicknesses. A kinked fatigue crack growth model based on the stress intensity factor solutions for finite kinked cracks and a structural stress model based on the closed-form structural stress solutions at the critical locations of the welds are adopted to estimate the fatigue lives of both types of welds. The fatigue life estimations based on the kinked fatigue crack growth model and the structural stress model appear to agree well with the experimental results for both types of welds.
مقدمه انگلیسی مقاله فرسودگى محل اصطکاک جوش آلومینیوم :
Introduction
Resistance spot welding is the most commonly used joining technique for body-in-white parts made of steel sheets. However, resistance spot welding of aluminum sheets is likely to produce poor welds as reported by Thornton et al. [1] and Gean et al. [2]. Recently, a spot friction welding technology for joining aluminum sheets has been developed by Mazda Motor Corporation and Kawasaki Heavy Industry [3,4]. The most significant advantage of the spot friction welding process comparing to the conventional welding processes is that the joint can be made without melting the base metal. A schematic illustration of the spot friction welding process was presented, for example, in Lin et al. [5].
The mechanical behavior of aluminum spot friction welds under quasi-static loading conditions was studied, for example, see Lin et al. [5], Pan et al. [6], Fujimoto et al. [7,8] and Hinrichs et al. [9]. The metallurgical aspects of aluminum 6111 spot friction welds were investigated by Mitlin et al. [10]. Tran et al. [11] investigated the failure loads of spot friction welds in aluminum 6111 lap-shear specimens under quasi-static and dynamic loading conditions. Recently, Lin et al. [12–15] investigated the fatigue behavior of spot friction welds made by different tools in aluminum 6111 sheets based on experimental observations and fracture mechanics. A comprehensive literature review for spot friction welds can be found in Pan [16]. Note that most of the literature is for spot friction welds between similar aluminum sheets. However, dissimilar spot friction welds between aluminum 2017-T6 and 5052 sheets, between aluminum 5754 and 6111 sheets, and between aluminum 5754-O and 7075-T6 sheets were investigated by Tozaki et al. [17], Su et al. [18] and Tran et al. [19], respectively.
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