Fundamentally understanding the temperature-dependent modulus is the key issue for materials serving in high temperature environments. This paper proposes a model based on lattice vibration theory to predict the temperature-dependent modulus with respect to isothermal and isentropic assumption. The thermal vibration free energy is expressed as a function of the two independent scalars from the strain tensor and temperature. By using the Einstein theory, we present the analytical expression for the temperature-dependent Young's modulus, bulk modulus, shear modulus, and Poisson's ratio. The theoretical prediction agrees well with the experimental data. The proposed model is further degenerated to Wachtman's empirical equation and provides the physical meaning to the parameters in Wachtman's equation.
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Chongqing University,
Chongqing 400044, China;
Chongqing University,
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April 2014
Research-Article
Temperature-Dependent Modulus of Metals Based on Lattice Vibration Theory
Honghong Su,
Chongqing University,
Chongqing 400044, China;
Honghong Su
College of Resource and Environment Science
,Chongqing University,
Chongqing 400044, China;
AML,
Department of Engineering Mechanics,
Tsinghua University,
Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084
, China
Search for other works by this author on:
Xue Feng,
Xue Feng
1
e-mail: fengxue@tsinghua.edu.cn
Department of Engineering Mechanics,
Tsinghua University,
AML
,Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
;Center for Mechanics and Materials,
Tsinghua University,
Beijing 100084,
Tsinghua University,
Beijing 100084,
China
1Corresponding author.
Search for other works by this author on:
Bo Yan
Chongqing University,
Bo Yan
College of Resource and Environment Science
,Chongqing University,
Chongqing 400044
, China
Search for other works by this author on:
Honghong Su
College of Resource and Environment Science
,Chongqing University,
Chongqing 400044, China;
AML,
Department of Engineering Mechanics,
Tsinghua University,
Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084
, China
Xue Feng
e-mail: fengxue@tsinghua.edu.cn
Department of Engineering Mechanics,
Tsinghua University,
AML
,Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China
;Center for Mechanics and Materials,
Tsinghua University,
Beijing 100084,
Tsinghua University,
Beijing 100084,
China
Bo Yan
College of Resource and Environment Science
,Chongqing University,
Chongqing 400044
, China
1Corresponding author.
Manuscript received August 14, 2013; final manuscript received September 8, 2013; accepted manuscript posted September 12, 2013; published online October 29, 2013. Editor: Yonggang Huang.
J. Appl. Mech. Apr 2014, 81(4): 041017 (4 pages)
Published Online: October 29, 2013
Article history
Received:
August 14, 2013
Revision Received:
September 8, 2013
Accepted:
September 12, 2013
Citation
Su, H., Fang, X., Feng, X., and Yan, B. (October 29, 2013). "Temperature-Dependent Modulus of Metals Based on Lattice Vibration Theory." ASME. J. Appl. Mech. April 2014; 81(4): 041017. https://doi.org/10.1115/1.4025417
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