Plot aluminium alloys, steels, CFRP and GFRP onto a copy of the \(E-ho\) chart for natural materials (Figure 13.15 of Chapter 13, Hybrids: Case Studies), where \(E\) is Young's modulus and \(ho\) is the density. How do they compare, using the flexural stiffness index \(E^{1 / 2} / ho\) as criterion of excellence? The table lists the necessary data.

Data From Figure 13.15

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Material Young's Modulus E (GPa) Density P (kg/m) Aluminium alloy 74 2700 Steel 210 7850 CFRP 100 1550 GFRP 21 1850