Joining of Carbon Fibre Reinforced Plastics for Automotive Applications
作者： Gordon Kelly
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摘要: The introduction of carbon-fibre reinforced plastics in loadbearing automotive structures provides a great potential toreduce vehicle weight and fuel consumption. To enable themanufacture assembly composite structural parts,reliable cost-effective joining technologies must bedeveloped. This thesis addresses several aspects andload based onnon-crimp fabric reinforcement. bearing strength carbon fibre/epoxy laminates wasinvestigated considering the effects bolt-hole clearance.The laminate failure modes ultimate werefound to be significantly dependent upon stackingsequence, geometry lateral clamping load. Significantreduction at 4% hole deformation was foundfor both pin-loaded clamped laminates. ultimatestrength joints found independent theinitial clearance. behaviour hybrid (bolted/bonded) numerically experimentally. Athree-dimensional non-linear finite element model developedto predict load transfer distribution joints. Theeffect joint adhesive material propertieson determined through parameter study.An experimental investigation undertaken determine thestrength, mechanisms fatigue life joints.The were shown have greater strength, stiffness andfatigue comparison bonded However,the benefits only observed designs which allowedfor sharing between bolt. effect environment on durability bondedand investigated. fatiguelife decrease withincreased ageing time. Hybrid demonstrated increasedfatigue afterageing cyclic freeze/thaw environment. laminatessubject localised transverse loading investigatedconsidering specimen size, stacking sequenceand system. Damage initiate thelaminates low levels, typically 20-30% ultimatefailure dominant initial mode wasintralaminar shear failure, occurred sub-surfaceplies. Two different macromechanical wereidentified, fastener pull-through global collapseof laminate. damage patterns modewere depend sequence andresin Finite analysis used analyse thestress within first-plyfailure. Keywords:Composite, laminate, strength,joining, introduction, joint, elementanalysis, mechanical testing.
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