density 1000 10.000 (kg/m3) wood 100 aluminum composites steel and thermoplastics concrete titanium tensile fracture strength (MPa) 100 1000 10,000 10 Wood light alloys 2 concrete steels composites thermoplastics modulus of elasticity 10,000 100.000 1.000.000 (MPa)1000l 1 sees thermoplastics wood concrete aluminum titanium steel composites price per unit mass 1994 2 20 200 600 ($kg) 1 ▣steels and aluminum alloys titanium 7 thermoplastics Kevlar-carbon glass composites boron Figure 5.2 Comparison of Characteristics of Different Materials aluminum alloys Eglass Kevlar 49 High strength carbon High modulus carbon boron 风 specific modulus of elasticity tensile strength specific tensile modulus density density strength Figure 5.3 Specific Characteristics of Different Fibers 2003 by CRC Press LLCFigure 5.2 Comparison of Characteristics of Different Materials Figure 5.3 Specific Characteristics of Different Fibers TX846_Frame_C05 Page 71 Monday, November 18, 2002 12:09 PM © 2003 by CRC Press LLC