Fracture of knitted randomly oriented short-fiber composite

Abstract

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.

Mixed Mode Failure Criterion for Random Composites Using a Finite Element Model

“…The failure mechanisms involved during fracture of random fibre composites observed by previous researchers include: interfacial debonding energy, resin fracture energy and pull out energy [7]. The total CSERR of the composite is the superposition of each of the above failure mechanism:…”

“…Here the focus is in crack propagating through thickness of the materials using CTS fixture. The CTS testing was introduced by Richard etal [6,7]. The fracture behaviour of random composites under pure mode I and II loading has been studied by few researchers [8,9].…”

Milled Glass Fiber Filled-Poly(Ethylene Terephthalate-co-Isophthalate) Composites - Thermal and Mechanical Properties

“…Many papers have been published about the fracture properties of short glass fiber reinforced thermoplastic composites [8][9][10][11][12][13][14][15][16]. The testing procedures for fracture toughness determination are still far of being standardized, and quite different values of fracture toughness can be found for a given composite according to the testing method employed.…”