Analysis of the Effective Thermal Conductivities and Thermal Stresses of Composites

• Main Authors: Song-Shun Kao, 高頌舜
• Other Authors: Ruey-Bin Yang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/82674522534880862786

碩士 === 逢甲大學 === 航空工程所 === 93 === ABSTRACT The aim of this study is to analyze the effective thermal conductivities of composites containing randomly distributed spherical inclusions or cylindrical fibers. Theoretical studies have shown that the effective thermal conductivity of composites is strongly dependent on the volume fraction, the distribution, inclusion size and the thermal conductivities of constituents. Interfacial thermal contact resistance between matrix and inclusion is known to have a significant influence on the effective thermal conductivity of the composite. A generalized self-consistent model (GSCM) is developed to predict the effective thermal conductivity of composites reinforced with multi-layered spherical inclusion and multi-layered cylindrical orthotropic fibers. The interfacial thermal contact resistances between different constituent phases are considered in the formulation. This approach provides explicit expressions of the effective thermal conductivity of composites in terms of components of thermal conductivity, interfacial contact resistance and volume fraction of each layer of the inhomogeneous inclusion and orthotropic fibers. The proposed approach recovers the existing theoretical results for some simple special cases. The predicted results are compared with finite element analysis in published reference. The results show that the present model gives good prediction of the effective thermal conductivities for composites with multilayered interphases and interfacial thermal resistance. The local temperature and thermal stress fields of such composites subjected to uniform heat flux are estimated using present micromechanics model.