کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6748417 1430173 2018 55 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A reduced micromorphic single crystal plasticity model at finite deformations. Application to strain localization and void growth in ductile metals
ترجمه فارسی عنوان
یک مدل پلاستیکی تک کریستال میکرومورفیک با ضرایب محدود. کاربرد در محلی سازی کرنش و رشد خالی در فلزات چسبیده
کلمات کلیدی
مدل میکرومورفیک، انعطاف پذیری شیب کریستال مجذور کشی، محلی سازی فشار، باند لغزش گروه کینک، منظم سازی، رشد ناپایدار، انعطاف پذیری ضعیف اثر اندازه،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
A micromorphic single crystal plasticity model is formulated at finite deformations as an extension of Mandel's classical theory based on a multiplicative decomposition of the deformation gradient. It involves a single microslip degree of freedom in addition to the usual displacement components. Two main variants of the constitutive equations are proposed. The first one relies on a Lagrangian microslip gradient and leads to a Laplace term in the isotropic hardening law. In contrast, the second formulation, based on a generalized strain measure defined with respect to the intermediate configuration, is shown to induce both isotropic and kinematic enhanced hardening. The first formulation is implemented in a 3D finite element code. The model is applied first to strain localization phenomena in a single crystal in tension undergoing single slip. The regularization power of the model is illustrated by mesh-independent simulations of the competition between kink and slip bands. The model is then used to investigate void growth and coalescence in FCC single crystals. Cylindrical and spherical voids are considered successively. The simulations show, for the first time in the case of spherical voids embedded in a single crystal matrix, that smaller voids grow slower than bigger ones, and that the onset of void coalescence is delayed for smaller voids. These results are related to the fact that the field of plastic slip is found to be more diffuse around smaller voids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 134, 1 March 2018, Pages 43-69
نویسندگان
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