000003681 001__ 3681
000003681 005__ 20141118153350.0
000003681 04107 $$acze
000003681 046__ $$k2013-05-13
000003681 100__ $$aHorák, M.
000003681 24500 $$aDISTANCE-BASED AND STRESS-BASED GRADIENT-ENHANCED DAMAGE MODELS

000003681 24630 $$n19.$$pEngineering Mechanics 2013
000003681 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Praha
000003681 506__ $$arestricted
000003681 520__ $$2eng$$aDamage mechanics is a suitable framework for description of the behavior of quasibrittle materials. However, the classical theory fails after the loss of ellipticity of the governing differential equation. From the numerical point of view, loss of ellipticity is manifested by a pathological dependence of the results on the size and orientation of finite elements. To avoid such an undesired behavior, the model can be regularized by an implicit gradient formulation. However, this enhancement in its usual form leads to excessive energy dissipation near nonconvex boundaries (e.g. notches and obtuse corners). This paper describes two modifications of the standard gradient-enhanced damage formulation and their implementation into a finite element code. The difference between the formulations is illustrated by a numerical example.

000003681 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003681 653__ $$a

000003681 7112_ $$aEngineering Mechanics 2013$$cSvratka (CZ)$$d2013-05-13 / 2013-05-16$$gEM2013
000003681 720__ $$aHorák, M.$$iJirásek, M.
000003681 8560_ $$ffischerc@itam.cas.cz
000003681 8564_ $$s829463$$uhttps://invenio.itam.cas.cz/record/3681/files/080_Horak_M-FT.pdf$$y
             Original version of the author's contribution as presented on CD, SOL.
            
000003681 962__ $$r3632
000003681 980__ $$aPAPER