通过加速湿热老化, 研究了T700/5428复合材料在100 ℃水煮条件下的吸湿老化行为, 并研究了此条件下拉伸强度和压缩强度随时间的变化规律。结果表明:复合材料吸湿率的变化在湿热处理初期符合 Fick 第二定律, T700/5428复合材料在360小时到达饱和吸湿, 饱和吸湿率为0.93%, 水分子在复合材料中的扩散系数为4.92×10-5 mm2/s, 吸湿速率为7.36×10-3 s-1;复合材料的拉伸强度和压缩强度均随着湿热处理时间的增加而出现下降, 与自然状态相比, T700/5428复合材料拉伸强度的下降幅度为5.5%, 压缩强度的下降幅度为13.7%。
The hydrothermal aging behavior on T700/5428 composites in the condition of 100 ℃ water was studied in this paper with accelerated aging method.And the variation of tensile strength and compression strength of composites was also investigated.The results indicated that the moisture absorption change of composite followed the Fick's second law at the initial stage of hydrothermal treatment.T700/5428 composites reached the saturated moisture absorption statue after 360 hours, the saturated moisture absorption was 0.93%, the diffusion coefficient of the water molecule in composites was 4.92×10-5 mm2/s and the moisture absorption rate was 7.36×10-3 s-1.The tensile strength and compression strength of composites decreased with the increase of hydrothermal treatment time.The tensile strength and compression strength of T700/5428 composites decreased by 5.5% and 13.7% respectively compared with that in the natural state.
[1]Ray B C.Temperature effect during humid ageing on interfaces of glass and carbon fibers reinforced epoxy composites [J].Journal of Colloid and Interface Science, 2006, 298(1):111-117.
[2]Errajhi O A Z, Osborne J R F, Richardson M O W, et al.Water absorption characterisitics of aluminized E-glass fiber reinforced unsaturated polyester composites [J].Composites Structures, 2005, 71(3-4):333-336.
[3]Beg M D H, Pickering K L.Reprocessing of wood fiber reinforced polypropylene composites.Part II:Hygrothermal ageing and its effects[J].Composites:Part A, 2008, 39(7):1565-1571.
[4]Yanmei Li, John Miranda, Hung-Jue Sue.Hygrothermal diffusion behavior in bismaleimide resin [J].Polymer, 2001, 42(18):7791-7799.
[5]Jiming Zhou, James P.Lucas.The effects of a water environment on anomalous absorption behavior in graphite/epoxy composites [J].Composites Science and Technology, 1995, 53(1):57-64.
[6]Li-Rong Bao, Albert F Yee.Moisturediffusion and hygrothermalaging in bismaleimide matrix carbon fiber composites:part II-woven and hybrid composites [J].Composites Science and Technology, 2002, 62(16):2111-2119.
[7]PATRICIA P P, WOUTER A W, HARALD E N, et al.Thermal effects on microstructural matrix variations in thick-walled composites [J].Composites Science and Technology, 2008, 68(3-4):896-907.
[8]SANDI M, DEMETRIO P, Paula H, et al.Graphite sheet coating for improved thermal oxidative stability of carbon fiber reinforced/PMR-15 composites [J].Composites Science and Technology, 2007, 67(10):2183-2190.
[9]Hancox N L.Thermaleffects on polymermatrix composites:Part 2.Thermal degradation [J].Materials & Design, 1998, 19(3):93-97.
[10]Foulc M P, Bergeret A, Ferry L, et al.Study of hygrothermal ageing of glass fibre reinforced PET composites [J].Polymer Degradation and Stability, 2005, 89(3):461-470.
[11]Pavlidou S, Papaspyrides C D.The effect of hygrothermalhistory on watersorption and interlaminar shear strength of glass/polyester composites with different interfacial strength [J].Composites Part A, 2003, 34(11):1117-1124.
[12]Selzer R, Friedrich K.Mechanical properties and failure behaviour of carbon fibre-reinforced polymer composites under the influence of moisture [J].Composites Part A, 1997, 28(6):595-604.
[13]Beckry Abdel-Magid, Saeed Ziaee, Katrina Gass, et al.The combined effects of load, moisture and temperature on the properties of E-glass/epoxy composites [J].Composite Structures, 2005, 71(3-4):320-326.
[14]Adams R D, Singh M M.The dynamic properties of fibre-reinforced polymers exposed to hot, wet conditions[J].Composites Science and Technology, 1996, 56(8):977-997.
[15]Swamy Naidu N V, Sinha P K.Nonlinear free vibration analysis of laminated composite shells in hygrothermal environments [J].Composite Structures, 2007, 77(4):475-483.
[16]BENKHEDDA A, TOUNSI A, ADDA BEDIA E A.Effect of temperature and humidity on transient hygrothermal stresses during moisture desorption in laminated composite plates [J].Composite Structures, 2008, 82(4):629-635.
[17]Selzer R, Friedrich K.Mechanical properties and failure behaviour of carbon fibre-reinforced polymer composites under the influence of moisture [J].Composites Part A, 1997, 28(6):595-604.