The assembly shown consists of an aluminum shell (Ea = 10.6 × 106 psi, αa = 12.9 × 10–6/°F) fully bonded to a steel core (Es = 29 × 106 psi, αs = 6.5 × 10–6/°F) and is unstressed. Determine (a) the largest allowable change in temperature if the stress in the aluminum shell is not to exceed 6 ksi, (b) the corresponding change in length of the assembly.
Fig. P9.80

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