Applied Mathematics and Mechanics (English Edition) ›› 2025, Vol. 46 ›› Issue (3): 423-446.doi: https://doi.org/10.1007/s10483-025-3230-9

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Thermo-mechanically coupled compatibility conditions in orthogonal curvilinear coordinates: equivalent temperature variation of initially stressed elastomers

Mengru ZHANG1,2, Mingzhu XU1,2, Weiting CHEN1,2,(), Yapu ZHAO1,2   

  1. 1.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
    2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100190, China
  • Received:2024-11-26 Revised:2025-01-16 Published:2025-03-03
  • Contact: Weiting CHEN, E-mail: chenweiting@imech.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 12241205 and 12032019), the National Key Research and Development Program of China (No. 2022YFA1203200), and the Strategic Priority Research Program of Chinese Academy of Sciences (Nos. XDB0620101 and XDB0620103)

Abstract:

The initial stresses widely exist in elastic materials. While achieving a continuum stress-free configuration through compatible unloading is desirable, mechanical unloading alone frequently proves insufficient, posing challenges in avoiding virtual stress-free configurations. In this paper, we introduce a novel concept of equivalent temperature variation to counteract the incompatible initial strain. Our focus is on initially stressed cylindrical and spherical elastomers, where we first derive the Saint-Venant, Beltrami-Michell, and Volterra integral conditions in orthogonal curvilinear coordinates using the exterior differential form theory. It is shown that for any given axially or spherically distributed initial stress, an equivalent temperature variation always exists. Furthermore, we propose two innovative initial stress forms based on the steady-state heat conduction. By introducing an equivalent temperature variation, the initial stress can be released through a compatible thermo-mechanical unloading process, offering valuable insights into the constitutive theory of initially stressed elastic materials.

Key words: initial stress, compatibility condition, thermal effect, orthogonal curvilinear coordinate, Cesàro-Volterra path integral

2010 MSC Number: 

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