温湿场交变环境下外加载荷对不同孔隙率CFRP弯曲力学性能影响  

Effect of external load on mechanical properties of CFRP bending under different temperatures and humidity

作　　者：姜明 贾近[1] 肖海英[1] 张东兴[1] JIANG Ming;JIA Jin;XIAO Haiying;ZHANG Dongxing(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2018年第5期38-43,共6页Journal of Harbin Institute of Technology

基　　金：黑龙江省自然科学基金(E201311)

摘　　要：为探究不同孔隙率碳纤维/环氧树脂层合板在仿超音速飞行的高低温湿热老化环境及外加载荷作用对弯曲力学性能的影响规律,基于材料服役期间的吸湿状态和内应力状态,对T700CF/3234EP进行模拟超音速飞机服役环境的高低温交变加速湿热循环试验.通过控制模压压力,制备3种孔隙率分别为0.04、0.08和0.11的层合板,将3种孔隙率的层合板进行加载,加载载荷为层合板最大弯曲载荷的0、30%、40%和60%,然后将其置于高低温环境模拟试验箱中,分别测量不同循环周期复合材料层合板的弯曲强度变化,并采用ABAQUS软件对其弯曲力学性能进行有限元模拟.试验结果表明:温湿场交变环境下,外加载荷和孔隙率加速层合板弯曲强度的下降,在高低温湿热循环4~6周期时,随着载荷的增大,二次固化现象越明显,层合板的弯曲强度变化比较平缓.使用ABAQUS软件建立有限元模型,计算得到的弯曲力学强度变化趋势与试验结果相一致,说明高低温湿热老化环境和外加载荷对复合材料弯曲性能的影响,对不同孔隙率的碳纤维/环氧树脂层合板弯曲性能进行较为准确的预测.In order to investigate the influence of different porosity carbon fiber/epoxy resin laminates on the bending mechanical properties at the high and low temperature and hygrothermal aging environment and subjected external load, the supersonic state and the internal stress state were simulated. High and low temperature accelerated hygrothermal cyclical tests for T700CF / 3234EP were employed to simulate supersonic aircraft service environment. Three laminates with porosity of 0.04, 0.08 and 0.11 were prepared by controlling the molding pressure. The loading of the laminates was loaded with 0, 30%, 40% and 60% of the maximum bending load of the laminates, respectively, and then placed in the high and low temperature environment test chamber. The bending strength of composite laminates under different temperature cycles is measured respectively, which were simulated based on ABAQUS software. The experimental results show that the external load and porosity increase the bending strength reduction of the laminates under the alternating temperature and humidity field. During the high and low temperature and hygrothermal cycle 4-6 periods, the secondary curing phenomenon becomes more obvious as the load increases andthe changes of the bending strength of the laminate is relatively gentle. The calculated trend of bending strength based on finite element model was consistent with the experimental results. The effects of high and low temperature, hygrothermal aging environment and external loading on the bending strength of composites were explained. The bending property of carbon fiber / epoxy resin laminates with different porosities were predicted accurately.

关 键 词：CFRP 孔隙 弯曲载荷 湿热环境 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]