湿热环境下泡沫复合材料夹芯板的Ⅱ型界面剥离
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摘要
本文通过端部切口弯曲试验(ENF)对湿热老化后泡沫复合材料夹芯板Ⅱ型界面剥离进行研究。测定了湿热老化前后玻璃纤维增强复合材料面板、聚氨酯泡沫芯材的抗压强度和压缩模量。结果表明,由于后固化作用,GFRP面板抗压强度、压缩模量先增大后减小;聚氨酯泡沫芯材的抗压强度、压缩模量先减小后趋于稳定。Ⅱ型临界能量释放率(Gc)随着老化时间的增加呈现下降趋势。湿热老化90天后,Gc下降26.68%。
A series of end notched flexure(ENF)tests for foam core composite sandwich structures before and after hygrothermal ageing were done to investigate the effects of hygrothermal ageing on the modeⅡinterfacial delamination.The compressive strength and modulus of glass fiber reinforced polymer(GFRP)laminates and polyurethane foams before and after hydrothermal aging were tested.Results show that the compressive strength and modulus of GFRP laminates increase initially followed by a significant decrease due to the effect of post-curing.In addition,the compressive strength and modulus of polyurethane foam decline sharply and then tend to be stable.In the meantime,the critical energy release rate of the modeⅡinterfacial delamination with different aging time shows a downward trend.The critical strain energy release rate(Gc)declines by 26.68% after hygrothermal ageing of 90 days.
A series of end notched flexure(ENF)tests for foam core composite sandwich structures before and after hygrothermal ageing were done to investigate the effects of hygrothermal ageing on the modeⅡinterfacial delamination.The compressive strength and modulus of glass fiber reinforced polymer(GFRP)laminates and polyurethane foams before and after hydrothermal aging were tested.Results show that the compressive strength and modulus of GFRP laminates increase initially followed by a significant decrease due to the effect of post-curing.In addition,the compressive strength and modulus of polyurethane foam decline sharply and then tend to be stable.In the meantime,the critical energy release rate of the modeⅡinterfacial delamination with different aging time shows a downward trend.The critical strain energy release rate(Gc)declines by 26.68% after hygrothermal ageing of 90 days.
引文
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[2]咸贵军,李惠.FRP复合材料土木工程应用与耐久性[J].材料工程,2010,(z1):121~126.
[3]王全凤,杨勇新,岳清瑞.FRP复合材料及其在土木工程中的应用研究[J].华侨大学学报(自然科学版),2005,26(1):1~6.
[4]唐桂云,王云飞,吴东辉,李建国.先进复合材料的无损检测[J].纤维复合材料,2006,23(1):33~36.
[5]王灿.泡沫夹芯复合材料界面破坏行为及增韧研究[D].大连理工大学博士学位论文,陈浩然,大连,2012.2.
[6]Majumdar P,Srinivasagupta D,Mahfuz H,et al.Effect of Processing Conditions and Material Properties on the Debond Fracture Toughness of Foam-core Sandwich Composites:Experimental Optimization[J].Composites Part A:Applied Science and Manufacturing,2003,34(11):1097~1104.
[7]Verghese N,Hayes M D,Garcia K,et al.Influence of Matrix Chemistry on the Short Term,Hydrothermal Aging of Vinyl Ester Matrix and Composites under Both Isothermal andThermal Spiking Conditions[J].Journal of Composite Materials,1999,33(20):1918~1938.
[8]Springer G,Sanders B,Tung R.Environmental Effect on Glass Fiber Reinforced Polyester and Vinylester Composites,Environmental Effects on Composite Materials[M].Westport,CT:Technomic Publishing Company,1981.
[9]姚宇超,许希武,毛春见.湿热环境下开孔复合材料层合板的强度[J].材料科学与工程学报,2015,33(3):425~431.
[10]于志成.复合材料Ⅱ型层间断裂韧性试验方法研究[J].航空材料学报,1997,17(4):54~61.
[11]Avilés F,Carlsson L A.Analysis of the Sandwich DCB Specimen for Debondcharacterization[J].Engineering Fracture Mechanics,2008,75(2):153~168.
[12]ShindoY,NaritaF,Sato T.Analysis of Mode II Interlaminar Fracture and Damage Behavior in End Notched Flexuretesting of GFRP Woven Laminates at Cryogenictemperatures[J].Acta Mechanica,2006,187(1~4):231~240.
[13]Horiguchi K,Shindo Y,Kudo H,Kumagai S.End-notched Flexure Testing and Analysis of Mode ii Interlaminar Fracture Behavior of Glass-cloth/epoxy Laminates at Cryogenictemperatures[J].Journal of Composites Technology&Research,2002,24(4):239~245.
[14]Ducept F,Davies P,Gamby D.Mixed Mode Failure Criteria for a Glass/Epoxy Composite and an Adhesively Bonded Composite/Composite Joint[J].International Journal of Adhesion and Adhesives,2000,20(3):233~244.
[15]朱华东.缝合复合材料II型层间断裂特性研究[J].复合材料学报,2001,18(2):85~89.
[16]Abanilla M A,Li Y,Karbhari V M.Durability Characterization of Wet Layup Graphite/epoxy Composites Used in External Strengthening[J].Composites Part B:Engineering,2006,37(3):200~212.
[17]周萌.GFRP与BFRP复合材料的湿热耐久性能研究[D].哈尔滨工业大学硕士学位论文,咸贵军,哈尔滨,2013,6.
[18]王晓洁.湿热老化对高性能复合材料性能的影响[J].固体火箭技术,2006,29(3):301~304.
[19]邓蕾.聚氨酯保温材料人工加速湿热老化性能研究[J].安全与环境学报,2014,14(3):49~53.
[20]尹凯.湿热环境下复合材料层间断裂特性试验研究[D].西北工业大学硕士学位论文,矫桂琼,西安,西北工业大学,1998.6.
[21]Quispitupa A,Berggreen C,Carlsson L A.On the Analysis of a Mixed Mode Bending Sandwich Specimen for Debond Fracture Characterization[J].Engineering Fracture Mechanics,2009,76(6):594~613.