کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4964043 | 1447423 | 2016 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A non-isothermal thermodynamically consistent phase field framework for structural damage and fatigue
ترجمه فارسی عنوان
یک چارچوب میدان فیزیکی غیر ترمودینامیکی غیر سازگار برای آسیب های ساختاری و خستگی
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کلمات کلیدی
خسارت، خستگی، میدان فاز، مدل غیر محلی، مدل سازگار با ترمودینامیکی، روش عددی محدود به روش بالا،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
نرم افزارهای علوم کامپیوتر
چکیده انگلیسی
We present a general thermodynamically consistent non-isothermal non-local framework for the evolution of damage, fatigue and fracture in materials under the hypothesis of small deformation. The approach is based on the principle of virtual power (PVP), the balance of energy and the second law of thermodynamics in the form of the generalized Clausius-Duhem inequality for the entropy. In addition to the usual physical fields, the model uses the phase field approach to describe the evolution of both damage and fatigue. The kinematic descriptor (phase field) for damage is considered a continuous dynamical variable whose evolution equation is obtained by the PVP. The kinematic descriptor (another phase field) for fatigue is a continuous internal variable whose evolution equation is considered as a constitutive relation to be determined in a thermodynamically consistent way. The behavior of particular material classes can be specified by their corresponding free-energy potentials (which gives the reversible parts of the involved thermodynamic forces) and their associated pseudo-potentials of dissipation (which gives the irreversible parts of the involved thermodynamic forces). To exemplify our general framework, we present the case of an isotropic linear elastic material with viscous dissipation and constant specific heat. The corresponding case of irreversible damage is also presented by using penalization. The considered damage and fatigue phase field approach is a framework from which other methods in the literature may be recovered. The model is approximated by the nodal high-order finite element method with explicit fourth-order Runge-Kutta time integration. Results for one-dimensional examples are presented and conclusions are addressed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computer Methods in Applied Mechanics and Engineering - Volume 312, 1 December 2016, Pages 395-427
Journal: Computer Methods in Applied Mechanics and Engineering - Volume 312, 1 December 2016, Pages 395-427
نویسندگان
J.L. Boldrini, E.A. Barros de Moraes, L.R. Chiarelli, F.G. Fumes, M.L. Bittencourt,