Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 73, Issue -, Pages 72-78Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2013.02.022
Keywords
Creep; Constitutive model; Aluminum alloy
Categories
Funding
- National Key Basic Research Program [2010CB731702]
- Program for New Century Excellent Talents in University [NCET-10-0838]
- Central South University [2012zzts076]
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, China [2012-P04]
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The high-temperature creep behaviors of 7075 and 2124 aluminum alloys are studied by the constant-stress uniaxial tensile creep experiments. Constitutive models for describing the high-temperature creep behaviors of the studied aluminum alloys are established based on the continuum damage mechanics (CDM). Firstly, the continuum damage mechanics (CDM) models are simplified to describe the primary and secondary creep of 7075 aluminum alloy. Secondly, because the effects of the applied stress on the creep damage during tertiary stage are not completely considered in the original CDM model, the modified constitutive models are proposed to predict the creep-rupture behavior of 2124 aluminum alloy. A stress exponent D, which can preferably reveal the effects of the applied stress on the creep damage, is introduced into the modified model. The results show that a good agreement between the measured and predicted results is obtained, which confirms that the established creep constitutive models can give an accurate and precise estimate of the high-temperature creep behaviors for 7075 and 2124 aluminum alloys. (C) 2013 Elsevier B.V. All rights reserved.
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