کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5014067 1463055 2017 29 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fatigue crack growth of aluminium alloy 7075-T651 under proportional and non-proportional mixed mode I and II loads
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Fatigue crack growth of aluminium alloy 7075-T651 under proportional and non-proportional mixed mode I and II loads
چکیده انگلیسی
This study aims to experimentally investigate fatigue growth behaviour in AA7075-T651 under proportional and non-proportional mixed mode I and II loads. Fatigue tests were performed under cyclic tension and torsion using a thin-walled tubular specimen with a key-hole style crack starter. After the generation of a single-side mode I pre-crack, varied forms of mixed mode loads were applied, which in most cases led to coplanar growth for a short distance followed by a long and stable crack path deviation. It was found that under most of the non-proportional mixed mode load cases, the direction of the deviated crack path could not be reasonably predicted using the commonly accepted maximum tangential stress criterion. Meanwhile, in some cases, the crack path directions could be approximately predicted using the maximum shear stress criterion. It was also confirmed for the first time that a long, stable and non-coplanar shear mode fatigue crack growth could be produced in AA7075-T651 under non-proportional mixed mode I and II loads. The implications of transient co-planar as well as stable shear-mode fatigue crack growth were discussed, revealing the needs of future investigations. ©2016 Commonwealth of Australia
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 174, 1 April 2017, Pages 155-167
نویسندگان
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