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根据陶瓷基复合材料界面脱黏区及黏结区纤维和基体的应力分布,分析了拉伸和卸载时纤维相对基体的滑移机制,发展了单向陶瓷基复合材料阻尼的计算方法,并进行了数值分析.结果表明:①陶瓷基复合材料本身固有黏弹性阻尼很小,材料发生基体开裂后,界面滑移而引起的摩擦耗散成为材料主要的阻尼机制;②减小界面剪应力或减小纤维体积含量可以改善材料的阻尼性能;③材料阻尼随裂纹间距的增大而减小.
According to the stress distribution in the interface between the debonding zone and the bonding area of ceramic matrix composites, the slippage mechanism of the fiber relative to the matrix during tensioning and unloading is analyzed, and the calculation method for the damping of unidirectional ceramic matrix composites is developed. The numerical results show that: (1) The intrinsic viscoelastic damping of the ceramic matrix composites is small, and the frictional dissipation caused by the interface slip after material cracking occurs as the main damping mechanism; (2) the interface shear stress is reduced or decreased Fiber volume content can improve the damping properties of the material; ③ material damping decreases with increasing crack spacing.