Impact Behavior and Energy Absorption of Composite Tubes Made from Fiber Fabrics or Prepregs

The impact behavior and energy absorption of two types of composite tubes, fabricated from carbon fabrics by the resin transfer molding and from carbon prepregs by the lay-up method, were investigated experimentally and numerically. In impact tests, outward-splaying crush caps with different fillet radii were used. Different types of crushing behavior of the tubes were simulated by the finite-element analysis, including a progressive failure function and considering the possibility of delamination. A comparison with experimental results confirmed that, the finite-element analysis was able to well predict the crushing behavior of the composite tubes, showing that the specific energy absorption of the prepreg composite tubes was always about 20% lower than that of the braided ones.