图 Georgiallnsmre ofTechnelogy The evolution of structural materials 105 Strength-Density Early history 3000 BC 10 Ceramics and glasses Metals 103 Antier Bone Leather lI to gran Ash 102 Shell Gold The first king:Menes Natural materials Stone 10 Pine Pottery ⊥to grain 0.1 0.01 0.01 0.1 10 100 Density,p (Mg/m3) 材料科学与工程学院 3 School of Materials Science and Engineering材料科学与工程学院 School of Materials Science and Engineering 3