Composite materials having a layer structure of “sandwich” construction as above used in car safety bumpers

This paper is devoted to modern problems of reinforcement materials used in car bumpers manufacturing and as well as safety issues. Paper discusses methods and provisions for car bumper reinforcement material., As result the fail-safe energy absorbing construction is presented and tested, made from laminates A, B and C with sandwich filling of the method vacuum bagging, which confirmed the possibility of absorbing energy (i. e. work) in the entire range from 3.858-6.680J (for a stationary barrier with an impact velocity of V = 10-15 km/h - formula 1). It was found that the destruction of sandwich laminates with sandwich fillers took place by cutting the interface and the resin layer between the carbon cloth layer and the glass matting layer. The highest impact value was determined for laminate A at the level of 133.75 J (with Soric XF™filling), which was characterized by inter-layer cracking with plastic deformation of the core. Lower by about 65 and about 36% of the average impact strength for laminate C and B respectively compared to the average impact strength of laminate A, the of observed as a result of defects in the structure (i.e. plastic core deformation and one-sided delamination of aluminum and polypropylene respectively - PP from the components of the composites). In future using sandwich structured composites materials is very important from cost profitability from point through, testing and manufacturing, as well as composites repairs.