Dynamic loading characteristics in metals and composites
Tan, Kian Sing.
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This study investigates the mechanical characteriztics of aluminum alloy AA3003-H14 when it is subjected to dynamical axial loads at low strain rates of less than 1s-1. The tensile experiments show that both the ultimate and yield stresses as well as the absorbed strain energy, increase with strain rate. Moreover, the strains at yield, ultimate load and fracture show positive sensitivity to strain rate. On the other hand, when the material is subjected to dynamic loading rates of more than 10-1 s-1, the elastic modulus diminishes as the strain rate increases, while both normalized yield and ultimate stresses increase noticeably. It is also appreciated that the amount of plastic strain energy accumulated in a ductile material in its loading time history is useful as a failure criterion for the prediction of failure. Finally, a failure criterion is proposed for loading with varying strain rates.
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