A Steel Bolt $\left( \text { area } = 130 \mathrm {~mm} ^ { 2 } , E _ { s } = 210 \mathrm { GPa } \right)$

question 8

Multiple Choice

A steel bolt $\left( \text { area } = 130 \mathrm {~mm} ^ { 2 } , E _ { s } = 210 \mathrm { GPa } \right)$ is enclosed by a copper tube (length = 0.5 m, area = $\left. 400 \mathrm {~mm} ^ { 2 } , E _ { c } = 110 \mathrm { GPa } \right)$ and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:

• A) \(56 \mathrm { MPa }\)
• B) \(62 \mathrm { MPa }\)
• C) \(74 \mathrm { MPa }\)
• D) \(81 \mathrm { MPa }\)

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