Dewetting has a great influence on the mechanical properties of composite propellant. The dewetting damage evolution at different tensile rates is researched using a constant speed tension and CCD optical microscope. A viscoelastic constitutive model was established. A microscopic reason is analyzed to interpret the development of micromechanical properties based on the micromechanics and interface mechanics theory. The results show that the dewetting between particles and matrix is an important factor on the macroscopic nonlinear stress-strain curves, and leads to the decline of Poisson's ratio. The damage of interfacial dewetting is determined by strain, and has a certain correlation with strain rate. Poisson's Ratio is also a powerful parameter to quantify the dewetting.%针对载荷作用下影响复合推进剂力学特性的脱湿问题,采用等速拉伸和CCD显微分析的试验方法,研究了不同拉伸速率下的脱湿损伤演化过程.建立了粘弹性本构模型,利用细观力学及界面力学的理论,分析试验测得的宏观力学性能发生发展的内在细观原因.结果表明:颗粒/基体的界面脱湿是宏观应力应变曲线非线性的重要原因,也直接导致材料泊松比的下降；界面脱湿的损伤程度由应变值决定,并与应变率具有一定的相关性,泊松比也是定量表征脱湿的重要参数.
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