Computational aspects of disturbed state constitutive models

• Published in: Computer methods in applied mechanics and engineering 1998-01, Vol.151 (3), p.361-376
• Main Authors: Desai, Chandra S., Zhang, Wu
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fracture mechanics, fatigue and cracks; Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Physics; Solid mechanics; Structural and continuum mechanics; Viscoelasticity, plasticity, viscoplasticity
• ISSN: 0045-7825; 1879-2138
• DOI: 10.1016/S0045-7825(97)00159-X

Disturbed state concept (DSC) provides a unified basis for constitutive modelling including elastic, plastic and creep deformations, microcracking, damage and softening, stiffening, and cyclic fatigue under thermomechanical loading. It includes intrinsically regularization, localization, characteristic dimension and avoidance of spurious mesh dependence. It also leads to a new procedure for mesh adaptivity, particularly in zones experiencing significant microcracking and softening. The idea of the critical disturbance allows identification of the initiation of fracture and its growth as a consequence of microcrack coalescence. The DSC is implemented in nonlinear finite element procedures and a number of problems have been solved, and results are evaluated and compared with solutions by other methods so as to illustrate the foregoing capabilities of the model.