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加速试验方法(ATM,Accelerated Testing Methodology)基于复合材料基体的黏弹性特性,根据时间-温度叠加原理,用较高温度下的短期强度预测较低温度下的长期强度.对应变不变量失效理论(SIFT,Strain Invariant Failure Theory)进行改进,采用微观的最大应变准则判断纤维的拉伸和压缩失效.通过基体动态力学分析(DMA,Dynamic Mechanical Analysis)试验得到基体的储能模量控制曲线和时间-温度平移因子.通过不同温度下单向板拉伸、压缩试验得到破坏应变,根据时间-温度叠加原理采用基体的时间温度平移因子,构建SIFT临界值的控制曲线.采用应变不变量失效理论和加速试验方法(SIFT/ATM)结合渐进损伤分析,对准各向同性开孔板压缩长期强度进行了预测,并对破坏过程进行了模拟,分析了纤维和基体的失效过程.计算与试验结果吻合较好,证明了该方法的适用性.
Accelerated Testing Methodology (ATM, Accelerated Testing Methodology) Based on the viscoelastic properties of composite matrix, the long-term strength at lower temperatures is predicted by the time-temperature superposition principle and the short-term strength at higher temperatures. SIFT and Strain Invariant Failure Theory), the tensile and compressive failure of fiber were judged by the micro-maximum strain criterion.According to DMA (Dynamic Mechanical Analysis) test, the storage modulus control curve and time- Temperature translation factor.The failure strain is obtained through the tensile and compression tests of the unidirectional slab at different temperatures and the time-temperature translation factor of the substrate is used according to the principle of time-temperature superposition to construct the control curve of the critical value of SIFT.Using the theory of strain invariant failure and the acceleration SIFT / ATM combined with progressive damage analysis was used to predict the long-term compressive strength of isotropic apertured plate, and the failure process was simulated and the failure process of fiber and matrix was analyzed. The calculated results were in good agreement with the experimental results Well, it proves the applicability of this method.