A component is at present made from a brass, a copper alloy. Use the Young's modulus - Density \((E-ho)\) chart of Fig. 3.3 to suggest three other metals that, in the same shape, would be stiffer. 'Stiffer' means a higher value of Young's modulus.

Data From Fig.3.3

Transcribed Image Text:

Counges modulus density 1000 Doungs modulusE GPa 100 110 Longitudinal wave speed 10 ms 1 Rigid polymer foams 10-1 3x10 10-2 Foams 10 ms- 10-33x102 10-4 10 m.s 10 Technical ceramics Al alloys Composites CFRP Glass" Bamboo Mg alloys- -Wood grain Natural PMMA- materials PA GFRP Polyester PS Ciamond Al2O3 Steels SIC SigNa Ti alloys Ni alloys WC Concrete PEEK Zinc alloys O-W alloys Cu alloys... Metals Lead alloys Nontechnical Epoxies ceramics Wood 1 grain PC PP Leat a RET PE -PTFE EVA Polymers Scone elastomers Polyuret ane. Guidelines for minimum mass design Cork Isoprene Neoprene Flexible polymer foams Butyl rubber Elastomers 1000 100 MFA 100000 ensity pkgom FIGURE 3.3 Young's modulus, E, plotted against density, P. The heavy envelopes enclose data for a given class of material. The diagonal contours show the longitudinal wave velocity. The guidelines of constant E/P, E/2/p and E1/3/P allow selection of materials for minimum weight, deflection- limited, design.