کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6748508 1430176 2017 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An analysis of edge dislocation pileups against a circular inhomogeneity or a bimetallic interface
ترجمه فارسی عنوان
یک تجزیه و تحلیل لرزش لبه در برابر ناهماهنگی دایره ای یا یک رابط دوتایی
کلمات کلیدی
رابط دوتایی، نیروی پیکربندی، جابجایی جابجایی، جابجایی لبه، ناهمگونی، غلظت استرس،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
Equilibrium configurations of edge dislocation pileups against a circular inhomogeneity or a bimetallic interface are determined numerically for a given number N of dislocations, the applied shear stress τ, the size of the inhomogeneity, and the degree of material disparity. The increase of applied stress moves a pileup closer to the inhomogeneity and increases the density of dislocations within a pileup, which is more pronounced for smaller and softer inhomogeneities due to their weaker repulsion of dislocations. The configurational force exerted by the pileup on a circular inhomogeneity is equal to Nτbx, where bx is a Burgers vector of dislocations, plus a term dependent on dislocation positions and material properties. The configurational force on a bimetallic plane interface is equal to Nτbx, independently of dislocation positions and material properties. The stress concentration caused by dislocation pileups against different interfaces is evaluated and discussed, which is of importance for the study of interface cracking. In general, the increase of the shear modulus and the Poisson ratio disparities (G2/G1 and ν2/ν1, where the subscript 1 specifies the material in which dislocations reside) diminishes the interface stresses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 129, 15 December 2017, Pages 146-155
نویسندگان
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