Peer-reviewed veterinary case report
How elliptical fiber shapes affect tensile strength in CFRP plies
By Wu Z et al.·2026·College of Mechanical Engineering, China·View original on Europe PMC →
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Original publication title: Influence of Elliptical Fiber Cross-Section Geometry on the Transverse Tensile Response of UD-CFRP Plies Based on Parametric Micromechanical RVE Analysis.
Plain-English summary
This study looks at how the shape and size of fibers in a type of composite material called unidirectional carbon fiber reinforced polymer (UD-CFRP) affect its strength when pulled from the side. Researchers created a computer model that mimics the actual shape of these fibers, which are often not perfectly round, to see how different factors like the amount of fiber and its shape influence the material's strength. They found that having more fibers makes the material stronger, but if the fibers vary too much in size, it can weaken the material. The findings help improve the understanding of how these materials behave, especially when the fibers are not circular, and suggest that the new model can be a useful tool for future studies.
Abstract
Predicting the transverse tensile properties of unidirectional CFRP plies is often based on micromechanical representative volume elements (RVEs) with circular fiber cross-sections, whereas microscopic observations show pronounced ellipticity and size variability in actual fibers. A two-dimensional plane-strain micromechanical framework with elliptical fiber cross-sections is developed as a virtual testing tool to quantify how fiber volume fraction, cross-sectional aspect ratio and statistical fluctuations in the semi-minor axis influence the transverse tensile response. Random RVEs are generated by a hard-core random sequential adsorption procedure under periodic boundary conditions and a minimum edge-to-edge gap constraint, and the fiber arrangements are validated against complete spatial randomness using nearest-neighbor statistics, Ripley's K function and the radial distribution function. The matrix is described by a damage-plasticity model and fiber-matrix interfaces are represented by cohesive elements, so that high equivalent-stress bands in matrix ligaments and the associated crack paths can be resolved explicitly. Parametric analyses show that increasing fiber volume fraction raises the transverse elastic modulus and peak stress by thinning matrix ligaments and promoting longer, more continuous high-stress bands, while the cross-sectional aspect ratio redistributes high stress among ligaments and adjusts the balance between peak strength and the degree of failure localization. The observed size variability is represented by modeling the semi-minor axis as a normal random variable; a larger variance mainly leads to a reduction in transverse peak stress through stronger stress localization near very thin ligaments, whereas the elastic slope and the strain at peak stress remain almost unchanged. The proposed framework thus provides a statistically validated and computationally efficient micromechanical basis for microstructure-sensitive assessment of the transverse behavior of UD-CFRP plies with non-circular fiber cross-sections.
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Search related cases →Original publication on Europe PMC: https://europepmc.org/article/MED/41598070