A bar is (4 mathrm{~m}) long and has a diameter of (30 mathrm{~mm}). Determine the total amount
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A bar is \(4 \mathrm{~m}\) long and has a diameter of \(30 \mathrm{~mm}\). Determine the total amount of elastic energy that it can absorb from an impact loading if (a) it is made of steel for which \(E_{\mathrm{st}}=200 \mathrm{GPa}, \sigma_{Y}=800 \mathrm{MPa}\), and (b) it is made from an aluminum alloy for which \(E_{\mathrm{al}}=70 \mathrm{GPa}, \sigma_{Y}=405 \mathrm{MPa}\).
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