环境温湿度对泡沫复合材料夹层结构界面性能的影响

发布时间：2018-01-26 18:37

  本文关键词： 复合材料夹层结构 吸湿性能 双悬臂梁试验(DCB) 界面剥离 应变能释放率　出处：《南京工业大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：复合材料夹层结构是由复合材料作为面板、轻质材料作为芯材而形成的强度高、耐腐性好、可设计性强的高效结构形式。环境温湿度变化时,因面板和芯材的吸湿性能和热膨胀系数不同,界面处易积聚应力而导致剥离破坏。本文研究不同时间的干湿循环老化作用下泡沫复合材料夹层结构及其面板、芯材的吸湿性能,达到吸湿平衡时,芯材的吸湿率是面板的10倍左右;由于双侧面板的约束作用,夹层结构与面板的吸湿率相当。通过双悬臂梁界面剥离拉伸试验研究干湿循环老化构件在25和70℃两种温度环境条件下的界面性能,从试验所得的荷载-位移曲线可以看出:结构的界面强度随老化时间的延长而降低;温度对老化构件的界面力学性能影响显著,温度越高,界面强度越低,裂纹扩展越稳定。
[Abstract]:Composite sandwich structure is composed of composite material as panel and light material as core material, which has high strength, good corrosion resistance and strong designability. When the environment temperature and humidity change. Because the moisture absorption and thermal expansion coefficient of the panel and core are different, the stress accumulation at the interface will lead to the peeling failure. In this paper, the foam composite sandwich structure and its panel under the dry and wet cycle aging at different time are studied. The hygroscopicity of the core material is about 10 times of that of the panel when the moisture absorption balance is achieved and the moisture absorption rate of the core material is about 10 times that of the panel. Due to the constraint of both sides of the panel. The moisture absorptivity of sandwich structure is equivalent to that of panel. The interface properties of dry and wet cyclic aging members at 25 鈩，

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