Print Email Facebook Twitter A stress-based gradient-enhanced damage model Title A stress-based gradient-enhanced damage model Author Bongers, G. Contributor Sluys, L.J. (mentor) Brinkgreve, R.B.J. (mentor) Simone, A. (mentor) Faculty Civil Engineering and Geosciences Department Building Engineering Date 2011-12-02 Abstract One of the shortcomings of nonlocal damage models with a constant length scale parameter is the wrong prediction of damage initiation and propagation in correspondence of a strongly inhomogeneous strain field. This unphysical behavior can be corrected by considering an evolving length scale which is made a function of the stress state. Giry, Dufour and Mazars (2011) have recently proposed an approach, based on an integral nonlocal damage model, which solves the problem of incorrect initiation and propagation of damage as discussed by Simone et al. (2004). In this contribution, a similar approach is presented in a differential damage model, the gradient-enhanced damage model. The underlying idea, which is used to modify the governing equations, is explained. A new formulation of the finite element equations is derived, with attention to C0-continuity requirements. Representative examples will illustrate the performance of the proposed approach. Shortcomings of the model are pointed out and graphically explained using slight variations of the before-mentioned examples. Subject finite element methodsdamage modellingbrittle materials To reference this document use: http://resolver.tudelft.nl/uuid:8b0866ad-20fa-46cc-bb8e-ecaeb3a0d2e4 Embargo date 2011-12-07 Part of collection Student theses Document type master thesis Rights (c) 2011 Bongers, G. Files PDF Bongers_Guido_december_2011.pdf 880.56 KB Close viewer /islandora/object/uuid:8b0866ad-20fa-46cc-bb8e-ecaeb3a0d2e4/datastream/OBJ/view