Abstract
Mechanical characterization of microstructure is essential to estimate damages of FRP. In this study, an oblique unit model with 2 filaments arranged randomly has been proposed. Distance between filaments, loading direction, and volume fraction of fiber in the unit cell could be considered in the unit cell as random variables. Stress distributions around filaments and strength under transverse and shear loading were investigated. From these results, a failure envelope under tensile and in-plane shear stress can be estimated. Furthermore, in case of high volume fraction of fiber, strength of microstructure was estimated based on mesh superposition method.
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