湿热老化对T700/TDE-85复合材料层间剪切强度的影响
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摘要
对T700碳纤维/TDE-85环氧树脂(T700/TDE-85)复合材料进行人工加速湿热老化试验,研究了复合材料的吸湿特性和层间剪切强度随老化时间的变化规律,分析了吸湿率与层间剪切强度的关系,并观察了复合材料的表面和断口形貌。结果表明:当老化1 369h左右时,复合材料达到饱和吸湿状态,饱和吸湿率为0.74%,水分子在复合材料中的扩散系数为5.6×10~(-5) mm~2·s~(-1);在湿热老化初期,随老化时间的延长,复合材料层间剪切强度下降幅度较大,当达到饱和吸湿状态后,层间剪切强度下降幅度变小;复合材料层间剪切强度保持率与吸湿率呈近似线性关系;随老化时间的延长,复合材料的裂纹由层内向层间发展。
The artificial accelerated hygrothermal aging test was conducted on the T700 carbon fiber/TDE-85 epoxy resin(T700/TDE-85)composite.The variation law of moisture absorption characteristics and interlaminar shear strength of the composite with aging time was investigated.The relationship between moisture absorption rate and interlaminar shear strength was analyzed.The surface and fracture morphology of the composite were observed.The results show that when aged for about 1 369 h,the composite reached the saturated moisture state with the absorption rate of 0.74%.The diffusion coefficient of water molecule in the composite was 5.6×10-5 mm2·s-1.The interlaminar shear strength of the composite decreased greatly with the increase of aging time at the initial aging stage,and then decreased slightly after the moisture absorption reached saturation.The interlaminar shear strength retention rate and moisture absorption rate had a linear relationship approximately.With the increase of aging time,the mode of crack propagation developed from intra-layer cracks to interlayer cracks.
The artificial accelerated hygrothermal aging test was conducted on the T700 carbon fiber/TDE-85 epoxy resin(T700/TDE-85)composite.The variation law of moisture absorption characteristics and interlaminar shear strength of the composite with aging time was investigated.The relationship between moisture absorption rate and interlaminar shear strength was analyzed.The surface and fracture morphology of the composite were observed.The results show that when aged for about 1 369 h,the composite reached the saturated moisture state with the absorption rate of 0.74%.The diffusion coefficient of water molecule in the composite was 5.6×10-5 mm2·s-1.The interlaminar shear strength of the composite decreased greatly with the increase of aging time at the initial aging stage,and then decreased slightly after the moisture absorption reached saturation.The interlaminar shear strength retention rate and moisture absorption rate had a linear relationship approximately.With the increase of aging time,the mode of crack propagation developed from intra-layer cracks to interlayer cracks.
引文
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[15]裴晓园,尚博,李嘉禄,等.多层连接碳纤维纬编双轴向衬纱织物增强复合材料的层间剪切性能[J].材料研究学报,2015,29(8):613-621.
[2]沈尔明,王志宏,滕佰秋,等,连续纤维增强复合材料在民用航空发动机上的应用[J].航空发动机,2013,39(2):90-94.
[3]张焱,祖群.航空领域用特种高性能玻璃纤维材料[J].航空制造技术,2014(15):130-131.
[4]马立敏,张嘉振,岳广全,等.复合材料在新一代大型民用飞机中的应用[J].复合材料学报,2015,32(2):317-322.
[5]孙振起,吴安如.先进复合材料在飞机结构中的应用[J].材料导报,2015,29(11):61-64.
[6]谢可勇,李晖,孙岩,等,湿热老化对纤维增强树脂基复合材料性能的影响及其机理[J].机械工程材料,2014,38(8):1-5.
[7]李晔,钟翔屿,崔郁,等.CF3052/5284RTM复合材料湿热性能[J].宇航材料工艺,2010,40(4):84-87.
[8]COSTA M L.Strength of hygrothermally conditioned polymer composites with voids[J].Journal of Composite Materials,2005,39(21):1943-1961.
[9]惠雪梅,王晓洁,尤丽虹.CE/EP/CF复合材料的湿热性能研究[J].工程塑料应用,2006,34(5):49-51.
[10]WILDE D W P,FROLKOVICB P.The modelling of moisture absorption in epoxies:Effects at the boundaries[J].Composites,1994,25(2):119-127.
[11]MOHAN J,IVANKOVI'C A,MURPHY N.Effect of prepreg storage humidity on the mixed-mode fracture toughness of a co-cured composite joint[J].Composites Part A:Applied Science&Manufacturing,2013,45(2):23-34.
[12]吕小军,张琦,马兆庆,等,湿热老化对碳纤维/环氧树脂基复合材料力学性能影响研究[J].材料工程,2005,8(11):50-53.
[13]HUTAPEA P,YUAN F G.The effect of thermal aging on the Mode-I interlaminar fracture behavior of a hightemperature IM7/LaRC-RP46 composite[J].Composites Science&Technology,1999,59(8):1271-1286.
[14]郝信凯,黄胜德,张红卫,等.水浸泡对碳纤维拉挤杆的水吸收与剪切强度影响[J].玻璃钢/复合材料,2014(12):68-73.
[15]裴晓园,尚博,李嘉禄,等.多层连接碳纤维纬编双轴向衬纱织物增强复合材料的层间剪切性能[J].材料研究学报,2015,29(8):613-621.