The undercarriage of a cargo plane requires a metal with a compressive strength above \(200 \mathrm{MPa}\) and a high bending strength per unit weight, requiring a high value of the index \(\sigma_{f}^{2 / 3} / ho\). What metals does the chart of Fig. 3.4 suggest?

Fig. 3.4

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10,000 Strength-density Metals and polymers: yield strength, a Ceramics, glasses: modulus of rupture, MOR Elastomers: tensile tear strength, 1000 Composites: tensile failure, 10 Strength, of (MPa) 12 100 Foams Rigid polymer foams Composites Polymers and elastomers Ceramics Diamond Si3N4 Al2O3 SIC Ti alloys Steels Ni alloys Al alloys CFRP Mg alloys GFRP PEEK PMMA Woods, - Natural materials 0.1 Flexible polymer foams 0.01 10 100 Cork PP PE Woods, Zinc alloys Lead alloys Concrete Butyl rubber Silicone elastomers Metals Tungsten alloys Tungsten carbide -Copper. alloys Guidelines for minimum mass design 1000 Density, p (kg/m) 10,000 MFA 15