Correlation of Absorb Energy with PSD Energy and Area under Strain-Time Graph

Abstract

This paper reviews the relationship of energy absorption with power spectrum density (PSD) energy and area under strain-time graph at different parameters (material, impact speed, thickness). In automotive industry, lightweight material with high toughness and strength for wheel production is required in order to minimize fuel consumption. Impact test often performed to determine impact energy and toughness of material by calculate amount of energy absorb. However, most of material toughness measurement is not accurate and it is calculated as an estimation value. This scenario brings an idea to correlate the absorbed energy with PSD energy and area under strain-time graph from Charpy impact test. Absorbed energy and impact strain signal acquired by installing strain gauge to striker hammer that connected to data acquisition system (SOMAT eDAQ). Obtained strain signal is then analysed by plotted strain-time and PSD graphs. Results indicate a great correlation observed between absorbed energy with PSD energy and area under strain-time graph. As thickness of material increased, absorbed energy, PSD energy and area under strain-time graph increased were increased. In terms of speed, the amount of absorbed energy decreased as the speed of impact increased.