Energy-Based Inelastic Hardness of Soda-Lime Silicate Glass Satoshi YOSHIDA Satoshi YOSHIDA 1, 2 1, 2 , , Hiroshi SAWASATO Hiroshi SAWASATO 1, 2 1, 2 , , Masanori YOSHIKAWA Masanori YOSHIKAWA 1 1 , , Jun MATSUOKA Jun MATSUOKA 1, 2 1, 2 1 Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga, JAPAN 2 Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga, JAPAN