کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
277081 1430198 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A finite element framework for distortion gradient plasticity with applications to bending of thin foils
ترجمه فارسی عنوان
یک چارچوب عنصر محدود برای پلاستیک گرادیان اعوجاج با برنامه های کاربردی برای خم شدن فویل های نازک
کلمات کلیدی
پلاستیک گرادیان اعوجاج، روش عنصر محدود چرخش پلاستیک، تنشهای مرتبه بالاتر و انعطاف پذیر، خم شدن میکرو
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی

A novel general purpose Finite Element framework is presented to study small-scale metal plasticity. A distinct feature of the adopted distortion gradient plasticity formulation, with respect to strain gradient plasticity theories, is the constitutive inclusion of the plastic spin, as proposed by Gurtin (2004) through the prescription of a free energy dependent on Nye’s dislocation density tensor. The proposed numerical scheme is developed by following and extending the mathematical principles established by Fleck and Willis (2009). The modeling of thin metallic foils under bending reveals a significant influence of the plastic shear strain and spin due to a mechanism associated with the higher-order boundary conditions allowing dislocations to exit the body. This mechanism leads to an unexpected mechanical response in terms of bending moment versus curvature, dependent on the foil length, if either viscoplasticity or isotropic hardening are included in the model. In order to study the effect of dissipative higher-order stresses, the mechanical response under non-proportional loading is also investigated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 96, 1 October 2016, Pages 288–299
نویسندگان
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