کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7976132 | 1514692 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Corner fatigue cracking behavior of hybrid laser AA7020 welds by synchrotron X-ray computed microtomography
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Corner fatigue cracking behavior of hybrid laser AA7020 welds by synchrotron X-ray computed microtomography Corner fatigue cracking behavior of hybrid laser AA7020 welds by synchrotron X-ray computed microtomography](/preview/png/7976132.png)
چکیده انگلیسی
To elucidate the fatigue corner cracking behaviors related with gas pores of hybrid laser arc welded 7020-T651 alloys, both high-resolution in situ synchrotron X-ray computed microtomography and finite element based predictions containing the closure effect or significant plasticity have been undertaken in the domain of fracture mechanics. It is found that fatigue cracks are preferentially initiated from a pore intersecting with the corner free surface and that it steadily propagates inside the weld with a quarter elliptical shape. Moreover, the fatigue corner crack exhibits a very complex morphology. A quantitative agreement between the experiment and prediction of crack shape under executed loading cycles is observed. By using the critical stress intensity factor along the crack line, the modified fracture toughness of a given hybrid laser weld can also be determined numerically for three-dimensional non-penetration curved fatigue cracks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 651, 10 January 2016, Pages 604-614
Journal: Materials Science and Engineering: A - Volume 651, 10 January 2016, Pages 604-614
نویسندگان
S.C. Wu, C. Yu, P.S. Yu, J.Y. Buffière, L. Helfen, Y.N. Fu,