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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (4): 1207-1217.doi: 10.7527/S1000-6893.2015.0233

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Multiscale heat transfer analysis of Z-directional carbon fiber reinforced braided composites

SHI Youan1,2, HE Lixin2, QIU Bo1,2, ZENG Lei2, GENG Xiangren2, WEI Dong2   

  1. 1. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2015-04-09 Revised:2015-08-11 Online:2016-04-15 Published:2015-09-30
  • Supported by:

    National Natural Science Foundation of China (11402285,91216204)

Abstract:

In order to study multiscale heat transfer characteristics of the Z-directional carbon fiber reinforced braided composites, a procedure for predicting equivalent thermal property parameter through a combined approach of the generalized method of cells and multiscale heat transfer analysis is presented. With multiscale structure investigation by scanning electron microscopy, the generalized method of cells is adopted to establish micro-structure model of yarn and meso-structure model of composites for heat analysis. In the sequel, a three-dimensional numerical calculation method for heat-transfer in complex structure is developed using hybrid grid. Based on this, the laws of thermal property influenced by material parameters (i.e., fiber volume fraction in yarn, as well as the size of Z-puncture fiber) are studied by numerical simulations of heat transfer at different length-scale with consideration of isotropy and anisotropy property of component materials. Meanwhile, with adoption of multi-layers cells model, the global equivalent thermal property parameters, such as equivalent conductivity coefficient, equivalent density as well as equivalent specific heat, are predicted for the period of structure in composites considered fully. Finally, validation experiment is made. It is verified that the equivalent thermal parameter predicted by this method agrees well with the experimental values. The results demonstrate that the method presented in this work is a promising means for investigating micro-structure/meso-structure heat transfer characteristic of composites.

Key words: Z-directional carbon fiber reinforced braided composites, micro-structure/meso-structure characteristic, heat transfer model, multiscale heat transfer analysis, equivalent thermal parameter prediction, numerical calculation

CLC Number: