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Applied Mathematics and Mechanics >

2018 , Vol. 39 >Issue 7: 967 - 980

DOI: https://doi.org/10.1007/s10483-018-2349-8

Articles

Characterization of mechanical properties of aluminum cast alloy at elevated temperature

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  • 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;
    2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China;
    3. University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China;
    4. Motor Technical Center, Shanghai Automotive Industry Corporation, Shanghai 201804, China;
    5. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, U.S.A.;
    6. Department of Mechanics, College of Sciences, Shanghai University, Shanghai 200444, China

Received date: 2017-11-09

  Revised date: 2018-01-26

  Online published: 2018-07-01

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 11372173, 11672347, and 11727804) and the Science and Technology Development Foundation of Shanghai Automobile Industry (No. 1514)

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Abstract

The tensile response, the low cycle fatigue (LCF) resistance, and the creep behavior of an aluminum (Al) cast alloy are studied at ambient and elevated temperatures. A non-contact real-time optical extensometer based on the digital image correlation (DIC) is developed to achieve strain measurements without damage to the specimen. The optical extensometer is validated and used to monitor dynamic strains during the mechanical experiments. Results show that Young's modulus of the cast alloy decreases with the increasing temperature, and the percentage elongation to fracture at 100 ℃ is the lowest over the temperature range evaluated from 25 ℃ to 300 ℃. In the LCF test, the fatigue strength coefficient decreases, whereas the fatigue strength exponent increases with the rising temperature. The fatigue ductility coefficient and exponent reach maximum values at 100 ℃. As expected, the resistance to creep decreases with the increasing temperature and changes from 200 ℃ to 300 ℃.

Key words： turbulent theory; coherent structure; rough boundary layer; digital image correlation(DIC); optical extensometer; mechanical behavior; elevated temperature; aluminum(Al) cast alloy

Cite this article

Shuiqiang ZHANG, Yichi ZHANG, Ming CHEN, Yanjun WANG, Quan CUI, Rong WU, D. AROLA, Dongsheng ZHANG . Characterization of mechanical properties of aluminum cast alloy at elevated temperature[J]. Applied Mathematics and Mechanics, 2018 , 39(7) : 967 -980 . DOI: 10.1007/s10483-018-2349-8

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