Experimentelle und numerische Untersuchung ausgewählter zellularer Werkstoffe bei höheren Dehnraten

Experimental and numerical investigations of selected cellular solids at higher strain rates In order to research the behaviour at higher strain rates, experimental and numerical investigations on selected cellular solids were conducted. The experiments included the testing of a zinc foam and a new composite material, which is a combination of a porous mineral granulate and a matrix material. For the better understanding of phenomena observed at the real material, a model at the mesoscopic level of the material was generated using the finite element method. Effects, like the strain rate sensitivity and failure mechanisms were simulated. Furthermore, a few possible applications of the presented materials were investigated numerically.     

Werkstoffverhalten unter zügiger elastischer Beanspruchung

Material properties by continuous elastic straining Within the scope of a common research project of the steel and automotive industry, 20 sheet steels have been investigated to obtain input data for FE‐analysis. In detail, characteristical elastic, plastic and fatique values were determined by several testing institutes for a period of 3 years. Knowledge of dependency of Young’s modulus from temperature and orientation is important for spring back at the press shop and stiffness of parts for automotive. Young’s modulus was determined by tensile tests in delivered state, after prestraining, heat treatment at room temperature and –40 °C and 100 °C. Young’s modulus is dependent from the orientation to rolling direction and can be classified in groups. Young’s modulus of ferritic steels is decreased about 10 % by prestraining of 2 % but recovered after annealing at 170 °C. Temperature dependency well known from non destructive tests are confirmed.