周 Georgialnsutu。 ofTechnelegy The evolution of structural materials 105 Strength-Density Ceramics Present day Metals 104 Composites 103 CFRP Polymers and elastomers Mg G Natural Cu allore 102 Sllver materials 10 Zne aloys 时3 Foams 0.1 接 0.01 0.01 0.1 10 100 Density,p (Mg/m3) 10 材料科学与工程学院 6 School of Materials Science and Engineering材料科学与工程学院 School of Materials Science and Engineering 6