The effects of shock loading on the Youngrsquo;s modulus of alloy 2024 Al in two differently heathyphen;treated conditions in the shock pressure range of 58ndash;178 kbar were examined. It was found that while the effects of shock loading are to cause an increase on Youngrsquo;s modulus at one heathyphen;treated condition, the effects of shock loading are to cause a decrease in Youngrsquo;s modulus in the other heathyphen;treated condition. These seemingly opposite effects are explained in terms of the defect modulus theory of Mott and Friedel.
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