Innovative Material Systems for Composite Vehicle Structures

Abstract

Prepreg-based materials currently used in high-end applications as well as SMC/BMC-based materials used in automotive body panels are not likely to lead the future growth in the application of fibre-reinforced composites in primary as well as secondary vehicle structures. Out-of-autoclave techniques based on rapid fibre preforming and part consolidation will drive the structural composites applications in aerospace and automotive sectors. Fibre preforming has been identified as a key bottleneck in the composites supply chain, considering recent growth predictions in civil airframe and automotive markets. Automated Tape Laying machines have modest deposition rates, and global autoclave capacity is not likely to cope with projected growth rates in composites. This paper investigates the potential for near-net preforming using conventional textile technology as well as robotic approaches. Robotic or multi-axial machines have been shown to extend the preforming capability of weaving, braiding and stitching concepts. A multi-axial weaving machine, equipped with automated trimming of non-interlaced tows, can create 3D woven preforms tapered in width as well as length directions. 3D preforms with through-thickness reinforcement have been created with a robotic system equipped with dry fibre lay-up and tufting capability. A 9-axis complex winding machine in conjunction with braiding has been demonstrated for preforming over complex mandrels.