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- W2014142375 abstract "A new experimental strategy for in situ measurement of the fiber/matrix interface strength is presented. As-fabricated graphite/epoxy laminates with specially designed grooved islands on their front surfaces were loaded on their rear sides by a 16 to 20 ns long laser-generated pressure pulse. This compressive stress pulse, generated in-line on the rear of one of the surface islands, propagates normal to the plane of the laminate and very quickly attains a steady-state profile of approximately 130 μm after undergoing multiple scattering from individual fibers and laminates. The returning tensile wave from the sample's free surface prises the composite island off by nucleating a subsurface crack. This crack on the local scale comprises several fiber/matrix interface debonds connected by the intervening matrix. The free-surface velocity causing this damage is recorded by interferometry and related to the far-field composite-scale tensile stress by using a one-dimensional elasto-dynamic analysis. The local fiber/matrix interface stress concentration corresponding to this overall tensile stress was determined next by using a finite-element simulation that idealized the fiber distribution within the epoxy matrix to be periodic. The interface tensile strength was taken as the sum of this stress and the compressive residual stress at the same location, which in turn, was estimated by yet another analysis based on the finite-element procedure. For a graphite/epoxy laminate fabricated from a unidirectional Hercules AS4 graphite fiber tapes pre-impregnated with 450 k cure Hercules 3502 thermosetting epoxy resin, an average fiber/matrix interface strength of 210 MPa was estimated." @default.
- W2014142375 created "2016-06-24" @default.
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- W2014142375 date "1998-11-01" @default.
- W2014142375 modified "2023-09-27" @default.
- W2014142375 title "Measurement of in situ fiber/matrix interface strength in graphite/epoxy composites" @default.
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- W2014142375 doi "https://doi.org/10.1016/s0266-3538(98)00048-7" @default.
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