$\text { heights } h _ { a } = 42 \mathrm {~mm} \text { and } h _ { s } = 68 \mathrm {~mm} \text {, }$

question 9

Multiple Choice

$$\text { A composite beam of aluminum } \left( E _ { a } = 72 \mathrm { GPa } \right) \text { and steel } \left( E _ { s } = 190 \mathrm { GPa } \right) \text { has a width } b = 25 \mathrm {~mm} \text { and }$$ $\text { heights } h _ { a } = 42 \mathrm {~mm} \text { and } h _ { s } = 68 \mathrm {~mm} \text {, }$ , respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately: $\text { MPa. }$

• A) \(86 \mathrm { MPa }\)
• B) \(90 \mathrm { MPa }\)
• C) \(94 \mathrm { MPa }\)
• D) \(98 \mathrm { MPa }\)

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