Panels are needed to board up the windows of an unused building. The panels should have the lowest possible embodied energy but be strong enough to deter an intruder who, in attempting to break in,...

Panels are needed to board up the windows of an unused building. The panels should have the lowest possible embodied energy but be strong enough to deter an intruder who, in attempting to break in, will load the panels in bending. (a) Which index would you choose from Table 9.3 to guide your choice?

(b) Plot the index on the Strength

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Embodied energy chart of Figure 9.14, positioning the line to find the best choice, excluding ceramics because of their brittleness. Which six do you find? What material classes do they belong to?