Load transfer within the bolted joint of a laminate made from ultra-high molecular weight polyethylene fibres

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  • Simon Peter Hald Skovsgård, University of Cambridge
  • ,
  • Henrik Myhre Jensen
  • Norman Fleck, University of Cambridge, Storbritannien
The mechanism of load transfer within the bolted joint of a laminate sheet made from ultra-high molecular weight polyethylene (UHMWPE) plies is investigated both experimentally and by an analytical model. The nature of load transfer and the active failure mechanisms are obtained as a function of joint geometry and of the lateral clamping force on the faces of the laminate (by pre-tensioning of the bolt). A combination of X-ray tomography and optical microscopy reveal that the dominant failure mechanism in the clamped joint is shear failure involving splits of the 0o plies and sliding at the interface between the 0° and 90° plies. A simple analytical model is developed for this shear failure mechanism and, upon noting the competing failure mechanisms of bearing failure, bolt shear and of tensile failure of the 0° plies, a failure mechanism map is constructed in terms of the geometry of the bolted joint, for the case of no pre-tension of the bolt. The analytical model for shear failure suggests that the enhancement in joint strength with increased pre-tensioning of bolt is due to the fact that the shear strength of the UHMWPE increases with increasing hydrostatic pressure.
TidsskriftInternational Journal of Solids and Structures
Sider (fra-til)182-190
Antal sider9
StatusUdgivet - 1 mar. 2020

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