Phase field based peridynamics damage model for delamination of composite structures

摘要: We extend and exploit a phase field based peridynamics (PD) damage model ( 39]) for studying delamination of composite structures. Utilizing augmented PD framework, our idea is to the interfacial cohesive through degradation functions fracture or fragmentation critical energy release rate. Our eliminates conventional traction-separation law (TSL) that known result in popular zone (CZM). In process, approach potentially addresses some limitations existing techniques, example, CZM, virtual crack closure technique (VCCT) so on, which make use an empirical interaction among different modes loading (e.g., mode I, II etc.). By regarding under conditions as problems differ only their boundary conditions, provides more general scheme tracking growth. proposal thus accords no special treatment can handle spatial locations weaker interface layers. With algorithms additional ad-hoc criteria propagation, considerable computational simplicity also accrues. The admits easy extension cases where cracks propagate even bulk material body. new bond breaking criterion we employ replaces inherent bond-stretch-based bond-energy-based conditions. Unlike standard models, physical body feasible present model. proposed methodology problem matter interpenetration by its very construction. Apart from initial validation exercise laminated plate with hole little occurs, numerical simulations on II, mixed order assess performance benchmarking it against available experimental evidence. Simulations modified bending multiple layer are presented. (C) 2017 Elsevier Ltd. All rights reserved.