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The cross section of a bimetallic strip is shown in the figure. Assuming that the moduli of elasticity for metals A and B are EA = 168 GPa and Eg

= 90 GPa, respectively, determine the smaller of the two section moduli for the beam. (Recall that section modulus is equal to bending moment divided by maximum bending stress.) In which mate-rial does the maximum stress occur?

Fig: 1

Fig: 2

Fig: 3