14-42. A bar is 4 m long and has a diameter of 30 mm. If it is to be used to absorb energy in tension from an impact loading, determine the total amount of elastic energy that it can absorb if ( a) it is made of steel for which Est = 200 GPa, sY = 800 MPa, and ( b) it is made from an aluminum alloy for which Eal = 70 GPa, sY = 405 MPa. | |
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