Novel variational formulations for nonlocal plasticity

被引：27
作者：
de Sciarra, Francesco Marotti [1 ]
机构：
[1] Univ Naples Federico 2, Dipartimento Ingn Strutturale, I-80125 Naples, Italy
来源：
INTERNATIONAL JOURNAL OF PLASTICITY | 2009年 / 25卷 / 02期
关键词：
Nonlocal plasticity; Structural models; Variational formulations; ENERGY MINIMIZATION; INTEGRAL-TYPE; CRACK-GROWTH; LOCALIZATION; DAMAGE; RELAXATION; ELASTICITY; PRINCIPLES; FRACTURE; SOLIDS;
D O I：
10.1016/j.ijplas.2008.02.002
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A nonlocal structural model of softening plasticity is considered in the framework of the internal variable theories of inelastic behaviours of associative type. The finite-step nonlocal structural problem in a geometrically linear range is formulated according to a backward difference scheme for time integration of the flow rule. The related finite-step variational formulation in the complete set of local and nonlocal state variables is recovered. A family of mixed nonlocal variational formulations, with different combinations of state variables, is provided starting from the general variational formulation. The specialization of a mixed variational formulation to existing nonlocal models of softening plasticity, assuming both linear and nonlinear constitutive behaviour, is provided to show the effectiveness of the theory. (C) 2008 Elsevier Ltd. All rights reserved.
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页码：302 / 331
页数：30
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