本文關鍵詞： 復合材料夾層結構 吸濕性能 雙懸臂梁試驗(DCB) 界面剝離 應變能釋放率　出處：《南京工業(yè)大學學報(自然科學版)》2017年05期 　論文類型：期刊論文

【摘要】：復合材料夾層結構是由復合材料作為面板、輕質(zhì)材料作為芯材而形成的強度高、耐腐性好、可設計性強的高效結構形式。環(huán)境溫濕度變化時,因面板和芯材的吸濕性能和熱膨脹系數(shù)不同,界面處易積聚應力而導致剝離破壞。本文研究不同時間的干濕循環(huán)老化作用下泡沫復合材料夾層結構及其面板、芯材的吸濕性能,達到吸濕平衡時,芯材的吸濕率是面板的10倍左右;由于雙側(cè)面板的約束作用,夾層結構與面板的吸濕率相當。通過雙懸臂梁界面剝離拉伸試驗研究干濕循環(huán)老化構件在25和70℃兩種溫度環(huán)境條件下的界面性能,從試驗所得的荷載-位移曲線可以看出:結構的界面強度隨老化時間的延長而降低;溫度對老化構件的界面力學性能影響顯著,溫度越高,界面強度越低,裂紋擴展越穩(wěn)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，

本文編號：1466306