Paper Title
ANALTERNATIVE WAY TO IMPROVE THE CRASH WORTH IN ESS PERFORMANCE OF THIN- WALL STRUCTURES BY USING HIGH STRENGTH STEEL WITH LOCALLY LASER HEAT TREATMENT

Abstract
This paper presents an alternative approach to improve the crash performance of high-strength steel for crashworthiness. In this work, a comparative study of crash performance of thin wall structures made of high-strength dual-phase steel with different locally laser heat treatment patterns will be evaluated by FEM simulation under axial impact loading condition. With the tempering process, softening behavior of the industrial made DP 1200 is achieved by short-term heat treatment in the furnace and then the material is laser heat treated by Kubo (6 kW) laser machine. After that, a uniaxial tensile test is carried out to get mechanical properties of heat-treated steels. The experimental results are next used as material inputs for the FEM simulation. Finally, the crash performance indicators such as the maximum peak force (Pmax), mean crash force (MCF), crash force efficiency (C. F. E), and energy absorption capacity (EA) will be investigated. Keywords - Highstrengthsteel,DP1200,Energyabsorption,FEMsimulationofthinwallstructures,crashbox, laser heat treatment