Multiscale modelling of thermal conductivity in composite materials for cryogenic structures

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• 作者：A. Alzina ; E. Toussaint ; A. Bé ; akou and B. Skoczen
• 关键词：Polymer-matrix composites ; Thermal properties ; Numerical analysis ; Thermal analysis ; Cryogenic temperatures
• 刊名：Composite Structures
• 出版年：2006
• 出版时间：July 2006
• 年：2006
• 卷：74
• 期：2
• 页码：175-185
• 全文大小：595 K

文摘

A multiscale analysis is performed to estimate overall thermal conductivity in a column-type support post used in particle accelerators to sustain cryomagnets. A non-linear homogenisation of thermal conductivity in a unidirectional composite material including phonon mechanism is firstly proposed by using the two-scale asymptotic expansion method. Next, computed conductivity curves are used for the modelling of heat transfer in a global representative volume element of the braided fabric composite. Thermal tests are conducted to measure conductivity of the material. A good agreement is obtained between estimated and measured values.