Maio, Leandro (2013) Numerical implementation of damage and fracture models for progressive damaging simulation in composite material structures. [Tesi di dottorato]

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The damage in composite materials and its prediction are the focus of this work. The reason for this choice is that there is a need to better understand the complex and multiple mechanisms of damage in composite structures and to develop failure theories and damage prediction model more reliable. In this context, the damage prediction tools have become increasingly important because composite structural testing is very expensive for industry. One of the most powerful computational methods for the composite structure analysis is the finite element method. In this research are examined and developed some of the most recent studies in the field of damage prediction and it will describe the issues associated to the application of these methods to composite structures. In detail the objective of the conducted research program is to enhance the damage prediction model capabilities for unidirectionally reinforced continuous carbon fiber reinforced polymers (CFRP). For this purpose, a cohesive-frictional model for the prediction of interlaminar damage (delamination) and a non-local constitutive model for intralaminar progressive damage simulation in composite laminated structures were defined. The proposed constitutive models were developed for explicit solver of commercial finite element software ABAQUS which has demonstrated to be a powerful tool for implementation of FORTRAN Vectorized User-Material (VUMAT) and for the simulation of discontinuous and unstable events. To verify the effectiveness of the implemented models numerical simulations were conducted and validated by experimental results available from literature.

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