Multiaxial stress creep rupture mechanisms of AZ31 magnesium alloy |
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Authors: | S H Kim H K Kim |
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Institution: | (1) Department of Structural Engineering, Seoul National University of Technology, Seoul, 139-743, Korea;(2) Department of Automotive Engineering, Seoul National University of Technology, Seoul, 139-743, Korea |
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Abstract: | The maximum principal stresses, von Mises effective stresses and principal facet stresses at the time of creep rupture were
compared in uniaxial, biaxial, and triaxial stress states for AZ31 magnesium alloy. The creep rupture of this alloy was experimentally
controlled by cavitation, which was the result of a low damage tolerance, λ. Creep deformation could be correlated with the von Mises effective stress parameter. The failure-mechanism control parameter
governing the stress state coincided with the experimental results of the rupture of the materials under multiaxial stress
states. Finally, the theoretical prediction based on constrained cavity growth and continuous nucleation agreed with the experimental
rupture data to within a factor of three. |
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Keywords: | AZ31 magnesium alloy Multiaxial stress states High-temperature rupture Creep cavitation Failure-mechanism control parameter |
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