کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455134 | 1514635 | 2017 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dislocation theory-based cohesive model for microstructurally short fatigue crack growth
ترجمه فارسی عنوان
مدل همبستگی مبتنی بر تئوری جابجایی برای رشد ترک خستگی کوتاه مدت است
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کلمات کلیدی
نظریه جابجایی، رشد کوتاه مدت، مدل منطقه محصور، ریز ساختار،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
A continuous representation of dislocations is used to represent a mode-II crack and the associated plastic zone. In the original formulation of dislocation theory, the friction stress that opposes the motion of the dislocations is represented by a constant stress. In our new formulation, we embed a cohesive zone in the plastic region in front of a crack tip by representing the friction stress as a function of the crack displacement. This allows cohesive zone models (obtainable from a lower scale simulation, such as molecular dynamics) to be integrated into a dislocation theory-based model, for the first time, to predict short crack growth. The details of this new formulation are shown for the two cases: the crack and the associated plastic zone inside a grain, and the crack and the associated plastic zone tip at the grain boundary. The main features of this new model are discussed along with an experimental comparison to the case of microstructurally short fatigue crack growth across two grains in a Ni-based CMSX-4 alloy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 708, 21 December 2017, Pages 395-404
Journal: Materials Science and Engineering: A - Volume 708, 21 December 2017, Pages 395-404
نویسندگان
Shardul Panwar, Veera Sundararaghavan,