کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
800442 1467558 2006 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Scale effects induced by strain-gradient plasticity and interfacial resistance in periodic and randomly heterogeneous media
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Scale effects induced by strain-gradient plasticity and interfacial resistance in periodic and randomly heterogeneous media
چکیده انگلیسی

A recently introduced variational formulation for strain-gradient plasticity with an additional potential that penalises the build-up of plastic strain at interfaces is summarised and applied to some one-dimensional examples. Novel features include a new strict upper bound for the effective potential of a single nonlinear medium containing interfaces distributed according to a Poisson process and approximate mean stress versus mean plastic strain curves for media with two power-law nonlinear phases separated by interfaces with their own nonlinear potential. Two-phase media with periodic and random microstructure are considered. In the case of random media, the results depend on the statistics of points, taken two at a time, in the combinations medium–medium, medium–interface, and interface–interface. In every case, the effective relation displays a Hall–Petch type of effect, the effective response becoming stiffer as the scale of the microstructure is refined. The admission of the interfacial potential removes a limitation of earlier work, that the response could not exceed the “Voigt” or “Taylor” bound of the corresponding classical material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanics of Materials - Volume 38, Issues 8–10, August–October 2006, Pages 702–716
نویسندگان
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