تلفن: ۰۴۱۴۲۲۷۳۷۸۱
تلفن: ۰۹۲۱۶۴۲۶۳۸۴

دانلود رایگان مقاله وضع فرسودگى محل اصطکاک جوش های ۵۷۵۴-O و ۶۱۱۱-T4 آلومینیوم

عنوان فارسی: وضع فرسودگى محل اصطکاک جوش های ۵۷۵۴-O و ۶۱۱۱-T4 آلومینیوم در نمونه های رويهم افتاده برشی
عنوان انگلیسی: Fatigue behavior of aluminum 5754-O and 6111-T4 spot friction welds in lap-shear specimens
تعداد صفحات مقاله انگلیسی : 16 تعداد صفحات ترجمه فارسی : ترجمه نشده
سال انتشار : 2008 نشریه : الزویر - Elsevier
فرمت مقاله انگلیسی : PDF کد محصول : E2492
محتوای فایل : PDF حجم فایل : 1 Mb
رشته های مرتبط با این مقاله: مهندسی مکانیک
گرایش های مرتبط با این مقاله: طراحی جامدات و جوشکاری
مجله: مجله بین المللی فرسودگى - International Journal of Fatigue
دانشگاه: مهندسی مکانیک، دانشگاه میشیگان، آن آربور،امریکا
کلمات کلیدی: اصطکاک محل جوش، اصطکاک حرکتی محل جوش، حالت شکست، طول عمر فرسودگی، شکاف پیچ خورده، تنش ساختاری
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چکیده

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.

نتیجه گیری

9. Conclusions

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.