期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 75, 期 -, 页码 39-62出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.06.005
关键词
Magnesium alloy sheet; Tension-compression test; Constitutive model; Non-isothermal; Formability
资金
- Mg Material R&D Project for the Super-light Vehicle operating for the execution of WPM (World Premier Materials) Program
- National Research Foundation of Korea (NRF) BK21Plus project (Kangwon National University) [22A20130012864]
- National Research Foundation of Korea (NRF) Grant - Korea government (MSIP) [2012R1A5A1048294, NRF-2014R1A2A1A11052889]
- National Research Foundation of Korea [22A20130012864] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Magnesium (Mg) alloys have unique room temperature mechanical properties such as yielding asymmetry, anisotropy, and unusual hardening response under strain path change. Mg alloy sheets often represent inferior formability at room temperature due to their limited active slip systems induced from specific microstructure and texture. This low formability is known to be mitigated as temperature increases, which is the result of active non-basal slip systems. Considering these unique properties, Mg alloy sheets has been often formed at 200 degrees C or higher. For optimizing the forming process using Mg alloy sheets, accurate constitutive models describing the unique behavior of the materials under non-proportional loading and non-isothermal temperature conditions are vital. In this paper, the mechanical behavior of AZ31B Mg alloy sheets under in-plane tension compression (or compression-tension) cyclic loading was experimentally measured for various pre-strains and temperatures. Then, a practical hardening model modified from existing advanced hardening law was applied to calculate the stress strain responses and formability in the cross shape die forming under non-isothermal condition. (C) 2015 Elsevier Ltd. All rights reserved.
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