Applied Mathematics and Mechanics (English Edition) ›› 2022, Vol. 43 ›› Issue (4): 507-522.doi: https://doi.org/10.1007/s10483-022-2835-9

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A modified fractional-order thermo-viscoelastic model and its application to a polymer micro-rod heated by a moving heat source

Wei PENG1, Like CHEN2, Tianhu HE1,3   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China;
    2. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
    3. School of Science, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2021-10-13 Revised:2022-01-11 Published:2022-03-29
  • Contact: Tianhu HE, E-mail:heth@lut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Nos.11972176 and 12062011)

Abstract: Classical thermo-viscoelastic models may be challenged to predict the precise thermo-mechanical behavior of viscoelastic materials without considering the memory-dependent effect. Meanwhile, with the miniaturization of devices, the size-dependent effect on elastic deformation is becoming more and more important. To capture the memory-dependent effect and the size-dependent effect, the present study aims at developing a modified fractional-order thermo-viscoelastic coupling model at the microscale to account for two fundamentally distinct fractional-order models which govern the memory-dependent features of thermal conduction and stress-strain relation, respectively. Then, the modified theory is used to study the dynamic response of a polymer micro-rod heated by a moving heat source. The governing equations are obtained and solved by the Laplace transform method. In calculation, the effects of the fractional-order parameter, the fractional-order strain parameter, the mechanical relaxation parameter, and the nonlocal parameter on the variations of the considered variables are analyzed and discussed in detail.

Key words: size-dependent effect, fractional-order strain, fractional-order thermal conduction, generalized thermo-viscoelasticity, moving heat source

2010 MSC Number: 

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