本文研究了单向纤维增强复合材料的热膨胀性能。引进界面粘结系数C,利用热弹性理论推导出经C修正后的线膨胀系数计算公式。由MOM型综合热分析仪测量了玻璃纤维和碳纤维复合材料在不同界面情况及不同纤维体积含量时的线膨胀系数。理论计算值与实测值相当接近,相对误差小于10％。 This article studies the thermal expansion properties of unidirectional fiber-reinforced composites. The interfacial adhesion coefficient C is introduced, and the formula for calculating the coefficient of linear expansion after C correction is derived from the thermoelastic theory. The linear expansion coefficient of glass fiber and carbon fiber composite at different interface conditions and different fiber volume contents was measured by MOM comprehensive thermal analyzer. Theoretical and measured values ​​are quite close, the relative error is less than 10%.