期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 159, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2021.104701
关键词
Strain-induced crystallization; Filled natural rubber; Multiaxial loadings; Infrared thermography; Heat source; Digital image correlation
资金
- National Center for Scientific Research (MRCT-CNRS)
- National Center for Scientific Research (MI-CNRS)
- Region Bretagne
- Rennes Metropole
This paper provides the first comprehensive thermo-mechanical characterization of filled natural rubber under uniaxial and biaxial loadings. The analysis evaluates energy contributions, distinguishes heat power density, and uses infrared thermography to assess strain-induced crystallinity. The experimental results contribute to a physically based modeling of the material's complex behavior.
The present paper provides the first full thermo-mechanical characterization of a crystallizing filled natural rubber under uniaxial and biaxial loadings. During the mechanical tests, the temperature was measured by using infrared thermography and processed by means of the heat diffusion equation for determining the corresponding heat power density. The intrinsic dissipation due to viscosity and stress softening are evaluated under cyclic loading by the energy balance. Energy contributions to the hysteresis loop converted into heat and stored in the material are distinguished. The heat power density is also used to evaluate the strain induced crystallinity. This analysis provides new results on the energetic behavior of filled natural rubber. Accordingly, crystallization takes place under high biaxiality levels, close to the equibiaxial loading condition, while multiaxiality influences the crystallization onset. These experimental results are used in the second part of the present paper for a physically based modeling of the complex behavior of filled natural rubbers.
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