Complete the selection of materials for light, stiff shells of Section 10.4 by plotting the stiffness index onto a copy of the modulus-density chart of Figure 9.11. Reject ceramics and glass on the...

Complete the selection of materials for light, stiff shells of Section 10.4 by plotting the stiffness index

onto a copy of the modulus-density chart of Figure 9.11. Reject ceramics and glass on the grounds of brittleness, and foams on the grounds that the shell would have to be very thick. Which materials do you find? Which of these would be practical for a real shell?