Observation of Fiber-Matrix Interfacial Stresses Using Phase-Stepping Photoelasticity

Sakai, Takenobu; Iihara, Yasunori; Yoneyama, Satoru

doi:10.1007/978-3-319-06986-9_24

Cited by 1 publication

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“…New techniques to measure in situ stress fields in composites such as digital image correlation are being increasingly used; however, photoelasticity still remains as a well‐established technique that provides reliable results with minimum investment in equipment. Photoelasticity also allows in situ analysis of the loading/deformation process of a specimen and the observation of stress distribution . Photoelastic studies of the pull‐out test in thermoplastic fiber/thermoset matrix systems have been performed to study their interface, for example, PET/epoxy composites , which provided the interfacial shear stress distribution directly from the image of isochromatic fringes; however, a complete study of the stress fields in this system, which includes the directions and distribution of the principal stresses in the matrix due to stress transfer, has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Photoelastic and numerical analyses of the stress distribution around a fiber in a pull‐out test for a thermoplastic fiber/epoxy resin composite

et al. 2017

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The stress distribution in a polyester fiber/epoxy matrix model composite subjected to pull‐out test was investigated through photoelasticity and elastic‐plastic numerical analysis using finite element (FE) simulations. A photoelastic technique was used to obtain isoclinic fringe patterns, which were employed to construct a pair of orthogonal families of principal stress trajectories for a pull‐out specimen. It was found that the trajectories of the maximum principal stress tend to converge at points where either the maximum interfacial shear stress is located or there is stress concentration. The FE simulations proved to be a powerful tool that allowed understanding the 3D stress distributions, in areas located near the embedded fiber, where principal directions were influenced by radial stresses, effects of Poisson's ratio, reduction of fiber diameter and plasticity. The FE simulations could be extended to quantify stress fields in other single‐fiber test configurations. POLYM. COMPOS., 39:E2397–E2406, 2018. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%