The table lists the moduli and strengths of spring materials. Plot these onto a copy of the

Question:

The table lists the moduli and strengths of spring materials. Plot these onto a copy of the ${ }^{E-\sigma_{f}}$ chart for natural materials of Figure 13.15 of Chapter 13, Hybrids: Case Studies, and compare their energy-storing performance with that of natural materials, using the $\sigma_{f}^{2} / E$ as the criterion of choice. Here $\sigma_{f}$ is the failure stress, $E$ is Young's modulus and $ho$ is the density.

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