City Guilds Model Questions Vol1 2017 Engineering Question 19
Practice objective / multiple choice question 19 from the 2017 City Guilds Model Questions Vol1 Engineering examination.
A bi‑material rod is made by bonding a steel segment (coefficient of thermal expansion \(\alpha_s = 12\times10^{-6}\) °C\(^{-1}\), Young's modulus \(E_s = 200\) GPa) of length \(1.2\) m to an aluminium segment (\(\alpha_a = 23\times10^{-6}\) °C\(^{-1}\), \(E_a = 70\) GPa) of length \(0.8\) m. Both segments have the same cross‑sectional area and the ends of the assembled rod are fixed so that the total change in length is zero. If the temperature is raised uniformly by \(50\) °C, determine the axial stress (in MPa) developed in each material. State whether the stress is tensile or compressive.
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About This Question
This is City Guilds Model Questions Vol1 2017 Engineering Question 19. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Medium .
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