Carbon fibre textile composite for automotive applications

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A JLR body structure must perform a significant number of functions including all of thoserequired for crash, NVH & durability attributes. JLR aspiration is that all of these attributesare assessed using virtual methods e.g. finite element models. The accuracy of these modelsdepends on 2 main inputs 1. Geometry (a true representation of the design) & 2. Materialmodels (how the design responds when loaded) - get either wrong & significant risk (timing,cost etc.) is added into a programme.Carbon Fibre Composites are a highly anisotropic material where effectively a new materialproperty is created every time a fibre angle, fibre size or fibre/resin ratio is changed, evenwithin the same nominal material grade. In order to optimise the usage of these textilematerials, their material properties must be understood.Rather than adopting a traditional test & measure approach to materials characterisation(which typically costs thousands of pounds per material, takes weeks to complete, and needsto be repeated if there is any change to any of the vast number of variables in the format ofthe composite material), we propose developing innovative virtual models of the material atthe micro-scale and then using these models to extract the macro-scale material propertiesrequired for vehicle attribute model inputs.