Effects of surface treatment and weave structure on interlaminar fracture behaviour of plain glass woven fabric composites: Part II. Report of the 2nd round robin test results

Effects of Fibre Surface Treatment on Dynamic Tensile Properties of Glass Woven Fabric Reinforced Vinylester Composites

“…Meanwhile, the failure strains did not show any particular trends with respect to silane concentration. This observation is in sharp contrast to previous results showing signifi cant dependence of various quasistatic mechanical properties on the fi bre-matrix interface adhesion (affected by silane concentration) for essentially the same materials 17,22 . These studies showed that the increase in silane concentration increased the fi bre-matrix interfacial bond strength, which resulted in systematic improvements in both the tensile and fl exural strengths and moduli in quasi-static loading due to enhanced stress transfer between the fi bre and matrix.…”

“…Figure 12 shows a schematic drawing of crimping in a woven fabric. Less fi bre crimping in the warp direction, in turn, resulted in less fi bre straightening before tensile deformation, which was responsible A similar dependence of weave structure on interlaminar fracture resistance of the composites was also identifi ed in a previous study 22 . The interlaminar shear strength and interlaminar fracture toughness were consistently higher when loaded in the weft direction than in the warp direction.…”

“…It was shown that the unsized fi bres have greater frictional sliding energies against ballistic impact, whereas the compatible sized fi bres have higher strength with higher structural integrity. This paper is a continuation of previous studies on the characterisation of mechanical and fracture properties of glass fi bre vinyl ester matrix composites with a controlled fi bre surface treatment [17][18][19][20][21][22] . The mechanical responses of composites under impact tensile loading are compared with the corresponding static behaviour so as to identify the sensitivity of interface properties on strain rate dependent tensile behaviour.…”

“…These studies showed that the increase in silane concentration increased the fi bre-matrix interfacial bond strength, which resulted in systematic improvements in both the tensile and fl exural strengths and moduli in quasi-static loading due to enhanced stress transfer between the fi bre and matrix. The Charpy impact fracture toughness was approximately proportional to the silane concentration 17 , whereas the interlaminar fracture toughness and the crack growth resistance varied inversely with it 22 . The latter result is considered appropriate because the weak interface promotes fi bre-matrix interfacial debonding and therefore the fi bre bridging mechanism, when loaded in Mode I delamination 28 .…”