Question $11...(15$ pt$)$

You are working at a company called Lucky Trucks Co$.$ which is developing a new aluminium chassis for a new pick$-$up truck. Your manager has ordered some stock aluminum from a reputable company that has provided tensile strength tests results $($see Figure below$).$ Your manager suggests that the maximum allowable stress of the aluminum rods made from this stock should not exceed $25,000$ psi.

A$)$ Has your manager applied an appropriate safety factor? Explain. $(5$ Pt$)$

B$)$ What is the maximum length that a $48-$inch aluminum rod will be expected to extend? Is this plastic or elastic deformation? $(10$ Pt$)$

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y

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Figure $1$: Aluminium Tensile Strength Test Results