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鉴于复合材料性能的时间-温度相关性,对固化后的树脂基体(5228A)进行了动力学分析(Dynamic Mechanical Analysis,DMA),得到了试验窗口中不同温度下的储能模量曲线片段,利用封闭平移(Closed Form Shifting,CFS)方法对其进行扩展,建立了主曲线并得到了曲线片段对应的平移因子。根据加速试验方法(Accelerated Testing Methodology,ATM),分别以两种铺层的准各向同性开孔层板(CCF300/5228A)为研究对象,建立了匀应变率(Constant Strain Rate,CSR)压缩强度主曲线。借助微距拍摄和超声波C扫描,对其渐进损伤过程和不同温度下的破坏形貌进行了观测。结果表明:即使温度低于玻璃态转变温度,树脂基体动态力学性能也会随时间的增加而降低;单层较厚的开孔层板压缩强度对时间和温度更加敏感,而单层较薄的开孔层板则具有更好的损伤容限性能;温度升高、加载速率降低时,开孔层板压缩最终破坏主导因素从分层损伤趋于纤维屈曲。
In view of the time-temperature dependence of the properties of the composites, the dynamic mechanical analysis (DMA) of the cured resin matrix (5228A) was carried out. The storage modulus curves at different temperatures in the test window were obtained. Closed Form Shifting (CFS) method was used to extend it. The main curve was established and the corresponding translation factor of the curve segment was obtained. According to Accelerated Testing Methodology (ATM), two kinds of plyotropic isotropic perforated plates (CCF300 / 5228A) were selected as the research object, and the compressive strength at constant strain rate (CSR) The main curve. With the help of macro photography and ultrasonic C-scan, the progressive damage process and the damage morphology at different temperatures were observed. The results show that the dynamic mechanical properties of the resin matrix decrease with time even though the temperature is lower than the glass transition temperature. The compressive strength of the perforated laminate with a single layer is more sensitive to time and temperature, while the single layer is thinner Perforated lamellae have better damage tolerance performance. When the temperature rises and the loading rate decreases, the ultimate failure of the lamellar lamellae ultimately damages the fiber buckling from delamination damage.