Development of fracture and damage modeling concepts for composite materials

Development of fracture and damage modeling concepts for composite materials

An overview of proposed micro-crack based damage models for fibre reinforced composite plates is presented.
A critical analysis has been performed on the potential application of those models for damage accumulation analysis of wide range fibre reinforced composite materials. The flaws and drawbacks of those models were critically analysed and presented in the text. Interestingly, it has been found that some proposed models can be extended or modified to address unresolved issues in crack propagation and damage accumulation in fibre reinforced composites. It can be concluded that the micromechanical approach alone is not sufficient to evaluate complete damage accumulation of composite and a significant theoretical modifications are required for existing brittle damage models before applying them to fibre reinforced composite materials.
The goal of the current paper is an overview of the numerical approaches and approaches’ limitation of plate with multiply cracks problem. The used approaches is discussed and summarized. Equations for two or three dimensions of plate is given for studying effect of crack density on effective moduli. The insensitive effective moduli to the sizes, orientation and location of individual microcracks is also discussed. In addition, the problem associated with limitation of the exciting approaches with increasing cracks density conditions is summarized to approve that necessary modifications the numerical approach and corrections are required. Due to an increase interest in using a fracture mechanics based on microcracks numerical approaches to assess the damage of composite structures, the laminated composites selected as example. The micromechanics approach is not enough to evaluate damage and also most of current theoretical need modification for simulate real conditions.

c. 2016 Taylor & Francis (CRC Press).