Condition for Determining the Ductile and Brittle Fracture in Notched Flat Bars of Polycarbonate : The Case of Constant Thickness

弘信, 西谷; 秀, 百武

doi:10.1299/kikaia.49.1071

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Stress Intensities Under Opening-mode Loading1

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1995

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“…In a double-edge-notched (DEN) specimen of an isotropic or slightly orthotropic elastic solid, the stress intensity factor associated with a crack tip may be determined from the solution given by Nisitani [12] as…”

Section: Stress Intensities Under Opening-mode Loadingmentioning

confidence: 99%

Fracture of knitted randomly oriented short-fiber composite

Hoffmann

Wang

1995

Int J Fract

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Fracture behavior of a chopped-mat E-glass fiber reinforced hybrid resin composite knitted with continuous poly(ethylene terephthalate) (PET) fibers is investigated by a combined experimental and analytical study. In both opening-mode (mode-I) and shear-mode (mode-II) fracture studies of the composite, the macroscopic critical stress intensities or toughnesses of the material are found to be distinct along the warp and fill directions of the knitting PET fibers. Values of I4(xi~ ) and K(n w) are lower than those of K~f ) and K~f v), owing to different fracture mechanisms involved. In the mixed-mode fracture of the composite, a failure envelope in I~] and tfn is constructed. The different mechanisms involved in opening-mode, mode-II and mixed-mode fracture are studied with SEM observations.

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Section: Stress Intensities Under Opening-mode Loadingmentioning

confidence: 99%