Abstract
When studying mechanical behavior of structures made of laminated polymer composite materials, issues related to their relatively high susceptibility to damage, such as delamination, fiber breakage and matrix failure, play significant role. Key aspects are also related to accurate description of the internal structures and heterogeneity of the material. This work is aimed at a numerical study of the processes of damage accumulation in plies as well as development of delamination in laminated polymer composite L-shaped specimen taking into account microstructural parameters. The influence of contact conditions between the plies on the model’s behavior has been studied. It was established that the delamination processes inside the specimen can initiate at the early stages of deformation, which is reflected in the difference of the results obtained using models with various numbers of separated plies. Comparison of the results of modelled elastic behavior of the specimen and models with the developed delamination leads to conclusions about influence of a number of model parameters on the results obtained before and after propagation of delamination. In particular, such factors as the geometry and mechanical properties of models, the number and conditions for specifying contact pairs in the model were analyzed.
Highlights
The difficulties in modeling of failure of laminated composite structures are related to the inhomogeneities of microstructure of composite materials
This work is aimed at a numerical study of the processes of damage accumulation in plies as well as development of delamination in laminated polymer composite L-shaped specimen taking into account microstructural parameters
The results show that in both cases the propagation of delamination and the accumulation of damage processes are not the same in different plies
Summary
The difficulties in modeling of failure of laminated composite structures are related to the inhomogeneities of microstructure of composite materials. When creating models of structures made of laminated composites in order to take into account all the basic mechanisms of failure it is necessary to (i) to create a laminated geometric ply-byply model of the composite material; (ii) analyze the state of contact between the plies on the basis of approaches of fracture mechanics that allow to numerically implement the process of separation of plies; (iii) evaluate the strength characteristics and damage accumulation in the ply by using its effective properties, and by establishing its relation to the analysis of local fields in microstructural components. This work is aimed at studying the influence of damage accumulation processes and changes in the stiffness properties in the woven ply of a polymer composite material on the development of delamination in laminated polymer composites structures. The numerical results of modeling of the mechanical behavior of the specimen using different criteria are compared and the relationship between the processes of delamination and damage accumulation in plies is studied
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