Use Fig. 3.3 to identify one metal and one polymer with a longitudinal wave speed close to \(1000 \mathrm{~m} / \mathrm{s}\).

Data From Fig. 3.3

Transcribed Image Text:

Joung s modulusE GPAD 1000 Coungos modulus density 100 10 10 Longitudinal wave speed 10 ms 1 Rigid polymer foams 10-1 3x10 10-2 Foams 10 ms-1 10-33x102 10-4 10 ms 10 100 Diamond Al2O3 Steels Technical ceramics SIC SigNa B.C. Al alloys Composites CFRP Ti alloys Ni alloys WC. O-W alloy's Glass Bamboo Mg alloys- GFRP Cu alloys -Metals -Wood grain Natural PMMA- materials PA- Polyester Lead alloys Concrete Zinc alloys PEEK PS- Wood Nontechnical Epoxies ceramics grain PC PP Leat RET PE EVA Polymers Silicone elastomers Polyuret ane. Guidelines for minimum mass design Cork Isoprene Neoprene Flexible polymer foams Butyl rubber 1000 Density pkgom Elastomers 100000 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. MFA 1