A new methodology to predict dynamic crack propagation under generalized loading conditions is proposed. The numerical modeling combines structural mechanics and moving mesh method with the purpose to predict geometry variation produced by the evolution of existing material discontinuities. In particular, moving mesh method is implemented to enforce crack tip displacements by using an explicit crack criterion based on referential and moving configurations. In this framework, the use of mesh regularization method based on proper rezoning equations is able to reduce the use of remeshing attempts, typically required by standard crack propagation procedures. Dynamic crack growth is predicted by a rate dependent criterion, expressed in terms of crack angle and driven forces based on energy release rate definition. The model is quite suitable to predict the evolution of material discontinuities, typically observed in composite structures. Numerical implementation, developed in the framework of a finite element formulation and details on the solving procedure, are presented. The proposed modeling is validated by several comparisons with experimental and numerical data, which show accuracy and robustness of the numerical approach. Moreover, sensitivity analyses in terms of mesh dependence and time required for the solving procedure are also developed.

Dynamic crack growth based on moving mesh method

Marco Francesco Funari;Fabrizio Greco;Paolo Lonetti
;
Raimondo Luciano;
2019

Abstract

A new methodology to predict dynamic crack propagation under generalized loading conditions is proposed. The numerical modeling combines structural mechanics and moving mesh method with the purpose to predict geometry variation produced by the evolution of existing material discontinuities. In particular, moving mesh method is implemented to enforce crack tip displacements by using an explicit crack criterion based on referential and moving configurations. In this framework, the use of mesh regularization method based on proper rezoning equations is able to reduce the use of remeshing attempts, typically required by standard crack propagation procedures. Dynamic crack growth is predicted by a rate dependent criterion, expressed in terms of crack angle and driven forces based on energy release rate definition. The model is quite suitable to predict the evolution of material discontinuities, typically observed in composite structures. Numerical implementation, developed in the framework of a finite element formulation and details on the solving procedure, are presented. The proposed modeling is validated by several comparisons with experimental and numerical data, which show accuracy and robustness of the numerical approach. Moreover, sensitivity analyses in terms of mesh dependence and time required for the solving procedure are also developed.
ALE; Composite structures; Crack propagation; Finite element method; Moving mesh technique
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/298059
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