考虑时间和温度影响的复合材料开孔层板压缩失效分析

发布时间：2018-05-04 13:23

本文选题：时间-温度相关 + 复合材料　；参考：《复合材料学报》2017年07期

【摘要】：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。
[Abstract]:In view of the time-temperature dependence of the properties of the composites, the kinetic analysis of the cured resin matrix (5228A) was carried out, and a segment of the curve of the storage modulus at different temperatures in the test window was obtained. The closed Form shift Form (CFS) method is used to expand it, and the main curve is established and the translation factor corresponding to the segment of the curve is obtained. According to the accelerated Testing method, two kinds of quasi-isotropic open-hole laminates (CCF300 / 5228A) were studied, and the main compressive strength curves of uniform strain rate constant Strain (Strain) were established. The progressive damage process and damage morphology at different temperatures were observed by means of macro photography and ultrasonic C scan. The results show that the dynamic mechanical properties of resin matrix decrease with the increase of time even if the temperature is lower than the glass transition temperature, and the compressive strength of the thicker monolayer porous laminates is more sensitive to time and temperature. When the temperature increases and the loading rate decreases, the ultimate failure factors of the perforated laminates change from delamination to fiber buckling.
【作者单位】：北京航空航天大学航空科学与工程学院;中国运载火箭技术研究院研究发展中心;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2010CB631103)
【分类号】：TB33

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