Peridynamic Meso-scale Modeling for Degradation in Transverse Mechanical Properties of Composites with Micro-void Defects
Source abstract
Abstract
The effect of micro-void on transverse stiffness and strength for fiber-reinforced composites subjected to load perpendicular to fiber is studied using the state-based peridynamic (PD) theory. The heterogeneous microstructure with micro-voids are discretized with irregular and non-uniform grids on mesoscale. The PD representative volume element with randomly distributed and sized micro-voids has been established with periodic boundary conditions. A parametric study was performed to evaluate the effects of void fraction and void size on transverse properties. It was found that the transverse modulus decreases with the void fraction in the range of 0.5–2%. A smaller void has a greater impact on the transverse modulus than a larger void under the same void content. The crack growth path for the multi-fiber model subjected to transverse tension was analyzed. The PD predictions show that cracks initiate at the interface between fiber and matrix, then deflect to the micro-voids nearby. The PD predictions match well with the analytical and experimental observations available in the literature.
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Research context
OpenAlex topics: Numerical methods in engineering · Geotechnical Engineering and Underground Structures · Electromagnetic Simulation and Numerical Methods
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