气动载荷下Al-GF/PP面板-三维中空夹层复合材料的强度特性  

Strength characterization of 3D hollow sandwich composite with Al-GF/PP faceplate under aerodynamic load

作　　者：林艳艳 郭兴豪 吴灿 李华冠[2] 项俊贤 陈熹 陶杰[3] LIN Yanyan;GUO Xinghao;WU Can;LI Huaguan;XIANG Junxian;CHEN Xi;TAO Jie(Kangni Research Institute of Mechanical&Electrical Industrial Technology,Nanjing Institute of Technology,Nanjing 211167,China;School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China;College of Materials and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京工程学院康尼机电产业技术研究院,南京211167 [2]南京工程学院材料科学与工程学院,南京211167 [3]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《复合材料学报》2024年第10期5315-5327,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52305374,52175327);江苏省高等学校基础科学研究项目(23KJB430020,22KJA430006);南京工程学院校级科研基金项目(YKJ202226);中国科协青年人才托举工程(2021QNRC001)。

摘　　要：随着高速列车的不断提速,特别是在通过隧道或会车时,气动载荷对蒙皮结构的强度特性提出了更高的要求。热塑性铝合金-玻纤/聚丙烯(Al-GF/PP)面板-三维中空夹层复合材料是一种以纤维金属层板为面板、三维中空复合复合材料为芯材的三明治夹层材料,具有轻质高强、隔音隔热等优势,可用于高速列车车门、裙板等蒙皮结构。通过比较不同高度(10~25 mm)的三维中空复合材料在平压、侧压及弯曲性能上的表现发现,随着厚度增加,其力学性能呈下降趋势,较厚的三维中空复合材料芯材弯矩较大,结构稳定性低。对Al-GF/PP面板-三维中空夹层复合材料进行了4 kPa、5 kPa、6 kPa、7 kPa的气动载荷测试。结果表明:当“8”形纤维受到垂直于面板方向的作用力时,纬向承担了主要载荷,这有助于减小纤维在加载方向上的位移量。芯材与上面板连接处承受的载荷应力最大,位移主要出现于结构的受载侧,最大位移值分别为1.80μm、2.26μm、2.72μm和3.19μm,该数量级的气动载荷不会导致试样出现宏观的变形失效。With the increasing speed of high-speed trains,especially when passing through tunnels or meeting cars,aerodynamic loads place higher demands on the strength characteristics of the skin structure.3D hollow sandwich composite with thermoplastic aluminum alloy-glass fibre/polypropylene(Al-GF/PP)faceplate is a kind of sandwich material with fiber metal laminates as faceplate and 3D hollow composite as core material,which has the advantages of lightweight and high strength,sound and heat insulation,and can be used in the skin structure of high-speed train doors,skirts and so on.By comparing the performance of 3D hollow composites with different heights(10-25 mm)in flatwise compressive,edgewise compressive and flexural properties,it is found that the mechanical properties show a decreasing trend with the increase of the thickness,and the thicker 3D hollow composites have higher bending moments in the core and low structural stability.Aerodynamic load tests of 4 kPa,5 kPa,6 kPa and 7 kPa were carried out on the 3D hollow sandwich composite with Al-GF/PP faceplate.The results show that when the"8"fibres are subjected to forces perpendicular to the faceplate,the weft fibres carry the main load,which help to reduce the displacement of the fibres in the loading direction.The highest loading stress is applied at the joint between the core and the upper panel,and the main displacement occurs on the loaded side of the structure,with maximum displacement values of 1.80μm,2.26μm,2.72μm,and 3.19μm,respectively,and the aerodynamic loading of this order of magnitude does not lead to macroscopic deformation and failure of the specimens.

关 键 词：纤维金属层板 三维中空复合材料 夹层复合材料 气动载荷 强度特性 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ327.1[化学工程—合成树脂塑料工业]