摘要
由于具有较好的力学性能和工艺稳定性,聚甲基丙烯酰亚胺(PMI)泡沫夹层结构在航空领域得到了大量的应用。目前飞机上通常采用预浸料与泡沫热压罐固化制造夹层结构,这种工艺成本较高且只能保证贴模面的表面质量。本文中采用闭模液体成型工艺制备了质量稳定的泡沫夹层结构,对比了同时注胶与交替注胶的制备方法,结果表明交替注胶可以得到更好的成型质量。并对泡沫芯材的力学性能进行了测试,在此基础上建立了泡沫材料的失效模型,并通过有限元分析了其三点弯曲、侧压屈曲等力学性能,有限元模型分析结果与实际测试结果基本一致,有限元模型可揭示在这些加载条件下夹层结构的破坏机理及渐进损伤过程,研究结果可推动高性能的航空用复合材料夹层结构的低成本化制备以及结构服役的虚拟试验。
Due to its high mechanical properties and processing stability,the polyimide foam sandwich structure has been widely used in aerospace.At present,the sandwich structure is mainly manufactured using the prepreg and is cured in the autoclave.This process is relatively high-cost and only provides the surface quality of the die surface.In this paper,a closed-mold liquid molding process is used to manufacture a foam sandwich structure.The simultaneous injection and alternate injection are compared.The results show that alternate injection can obtain better molding quality.In addition,the mechanical properties of the foam were tested.On this basis,the failure model of the foam was established,and its mechanical properties such as three-point bending and lateral compression buckling were carried out by finite element method.These finite element models have been verified by actual experiments and revealed the failure mechanism of the sandwich structure under these loading conditions.The research results can promote the low-cost preparation of high-performance aviation composite sandwich structures and the prediction of structural performance.
作者
原崇新
董青海
何斌
YUAN Chong-xin;DONG Qing-hai;HE Bin(Composite Center,Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 200123,China;Hunan Zhaoheng Material Technology Ltd.,Changsha 410200,China)
出处
《复合材料科学与工程》
CAS
北大核心
2021年第4期89-95,共7页
Composites Science and Engineering
基金
国家自然科学基金面上项目(51875159)。
关键词
PMI泡沫
夹层结构
闭模RTM
后屈曲
有限元
复合材料
PMI foam
foam sandwich structure
closed-mold RTM
post-buckling
finite element
composites
