As shown in article number 2200270 by Xin Ren, Yu Jun Qi, and co-workers, adding two curved ribs to the conventional re-entrant (CRE) honeycomb structure leads formation of a modified auxetic (MRE) structure. During quasi-static compression process, plateau stresses occur load–displacement curves Moreover, energy-absorbing performance MRE is substantially improved with occurrence second stress....

Car body lightening and crashworthiness are two important objectives of car design. Due to their excellent performance, composite materials are extensively used in the car industries. In addition, reducing the weight of vehicle is effective in decreasing the fuel consumption. Hat shape energy absorber is used in car’s doors for side impact protection. The aim of these numerical models and expe...

cylindrical thin-walled tubes due to construction and easy installation, high energy absorption capacity are used in the automotive industry as an impact energy absorber. however, the main weakness of cylindrical tubes is in the high initial peak load. therefore, in this paper, to overcome this weakness, a buckling initiator is used at the top of the tube. this buckling initiator is a steel rod...