Dynamic characterisation of composite materials with 4a impetus

With the increased use of fiber-reinforced plastic composites in the automotive industy, the demands on the accuracy of the simulation resulb and their informative value are constantly rising. Since the mechanical properties of these materials are often vey complex, a high experimental effort is necessary to obtain the required material parameter for the simulation. The use of reverse engineering methods offers the possibility of a material characterization with much less experimental effort. Until now this method was mainly used in the area of unreinforced or short fiber reinforced thermoplastics, foam materials and other isotropic materials. In combination with micro-mechanical models the number of determining parameters will be minimized so that even here the use of reverse engineering is possible, useful and costefficient. LS-Dyna offen many ways to inplement composite materials in FE simulations. ln addition to the numerous orthotropic / anisobopic material models, the modelling method plays a crucial role, too. 4a Impetus offen the possibiliy to get material cards for single-layer as well as for multilayer models. Both methods have their advantages in different load cases. This is illustrated in several examples.