A Micromechanics Model for Equivalent Thermal Expansion Coefficients and Thermal Stress of Unidirectional Lamina

作者：Chan Wen S^*; Srisuk N

来源：Journal of the Chinese Society of Mechanical Engineers, 2011, 32(6): 507-513.

• Unidirectional composite
• Coefficients of Thermal Expansion
• Thermal Stress
• Unit Cell Model
• Elliptical Fiber cross-section

A micromechanics model for a unit cell with an elliptical fiber cross-section was developed to calculate both the equivalent longitudinal and transverse thermal expansion coefficients of lamina and the stresses of the fiber and matrix in the cell due to temperature. The unit cell of lamina cross-section is spliced into infinitesimal layers. Each layer constitutes of various percentages of fiber and matrix constituents. A method similar to the lamination theory was developed to calculate the stiffness matrices and the equivalent thermal induced load due the change of temperature. Then both equivalent longitudinal and transverse thermal expansion coefficients as well as the stresses in each constituent of lamina were obtained. The present results are in an excellent agreement with finite element results. This study also shows that the fiber shape has significantly effect in the transverse coefficient of thermal expansion but not in the longitudinal coefficient of thermal expansion.

• 出版日期2011-12