کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5014988 1463719 2017 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
3D characterization of fatigue damage mechanisms in a cast aluminum alloy using X-ray tomography
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
3D characterization of fatigue damage mechanisms in a cast aluminum alloy using X-ray tomography
چکیده انگلیسی
Specimens of an Al-Cu-Si alloy were manufactured using die casting without additional machining. These specimens contained various kinds of natural defects were subjected to fatigue loading. The role of these defects was analyzed using fractography, X-ray tomography, and Finite Element simulations. Special emphasis was placed on the interaction between shrinkage pores and gas pores, and on internal flaw extension. It was found that multiple cracks can be initiated from shrinkage pores, and that lifetime is reduced considerably, if gas pores and shrinkage pores interact. Otherwise, the almost defect free casting skin restricted crack extension from shrinkage pores to internal crack advance with corresponding low crack growth rates. The role of the different defect categories in the fatigue damage accumulation process can be explained from a Finite-Element analysis of typical defects which showed that similar values of the stress concentration factor occurred at several locations on a typical shrinkage pore, and at irregular shaped gas pores.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 103, October 2017, Pages 363-370
نویسندگان
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