2.5维机织复合材料的纬向力学性能试验
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摘要
通过室温(20℃)及高温(180℃)静态拉伸及拉-拉疲劳试验,获得了2.5维树脂基机织复合材料在不同温度下的力学性能及拉-拉疲劳寿命。基于宏观试验,探讨了材料在静载及拉-拉疲劳载荷作用下的破坏模式和失效机理,对比了材料在疲劳载荷作用后的剩余强度与静强度的关系,之后分析了温度对材料静态力学性能及疲劳寿命的影响。结果表明:在20~180℃温度范围内材料的纬向模量对温度不敏感,但纬向强度及疲劳寿命随温度的升高而显著下降。在高温高应力水平(高于80%静强度)下材料的纬向疲劳寿命非常短(小于104次循环),但当应力水平仅下降2%后,材料的纬向疲劳寿命趋于106次循环。另外,高温下材料的剩余强度大于高温静强度。
The mechanical properties and tension-tension fatigue life of 2.5 Dresin base woven composites at various temperatures,including room temperature(20℃)and hightemperature(180℃),were obtained by static tensile and tension-tension fatigue tests.Based on macroscopic tests,the damage modes and failure mechanism of the materials subjecting to static tensile and tension-tension fatigue loadings were discussed.Meanwhile,the relationship between residual strength and static strength was compared,and the influence of temperature on the static tensile and fatigue life was then analyzed.The results show that the weft modulus is not sensitive to temperature,ranging from 20℃ to 180℃,but the weft strength and fatigue life have a downward trend with the temperature increase.The weft fa-tigue life experiences a quite short cycle(less than 104 cycles)prior to the ultimate failure at high temperature and high stress level(higher than 80% static strength),however,the corresponding life tends to be 106 cycles when the stress level declines by only 2%.Additionally,the elevated residual strength is higher than the static strength tested at the same temperature.
The mechanical properties and tension-tension fatigue life of 2.5 Dresin base woven composites at various temperatures,including room temperature(20℃)and hightemperature(180℃),were obtained by static tensile and tension-tension fatigue tests.Based on macroscopic tests,the damage modes and failure mechanism of the materials subjecting to static tensile and tension-tension fatigue loadings were discussed.Meanwhile,the relationship between residual strength and static strength was compared,and the influence of temperature on the static tensile and fatigue life was then analyzed.The results show that the weft modulus is not sensitive to temperature,ranging from 20℃ to 180℃,but the weft strength and fatigue life have a downward trend with the temperature increase.The weft fa-tigue life experiences a quite short cycle(less than 104 cycles)prior to the ultimate failure at high temperature and high stress level(higher than 80% static strength),however,the corresponding life tends to be 106 cycles when the stress level declines by only 2%.Additionally,the elevated residual strength is higher than the static strength tested at the same temperature.
引文
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[3]郑君,温卫东,崔海涛,等.2.5维机织结构复合材料的弹性性能预测[J].航空动力学报,2008,23(11):2031-2035.ZHENG Jun,WEN Weidong,CUI Haitao,et al.Elastic property prediction of 2.5 dimensional woven structure[J].Journal of Aerospace Power.2008,23(11):2031-2035.(in Chinese)
[4]燕瑛,成传贤.基于细观结构的三维机织复合材料弹性性能分析[J].航空学报,1999,20(4):289-294.YAN Ying,CHENG Chuanxian.Analysis of elastic property for 3-D woven composites based on fabric microstructure[J].Acta Aeronautica et Astronautica Sinica,1999,20(4):289-294.(in Chinese)
[5]WANG X F,WANG X W,ZHOU G M.Multi-scale analyses of 3D woven composite based on periodicity boundary conditions[J].Journal of Composite Materials,2006,41(14):1773-1788.
[6]董伟锋,肖军,李勇,等.2.5维编织复合材料弹性性能的理论研究[J].南京航空航天大学学报,2005,37(5):659-663.DONG Weifeng,XIAO Jun,LI Yong,et al.Theoretical study on elastic properties of 2.5Dbraided composites[J].Journal of Nanjing University of Aeronautics and Astronautics,2005,37(5):659-663.(in Chinese)
[7]杨振宇,俸翔,苏洲,等.2.5D编织复合材料细观结构及弹性性能[J].宇航材料工艺,2010,40(2):67-71.YANG Zhenyu,FENG Xiang,SU Zhou,et al.Meso-structure and elastic properties of 2.5Dbraided composites[J].Aerospace Materials and Technology,2010,40(2):67-71.(in Chinese)
[8]LU Z X,ZHOU Y,YANG Z,et al.Multi-scale finite element analysis of 2.5D woven fabric composites under onaxis and off-axis tension[J].Computational Materials Science,2013,79:485-494.
[9]卢子兴,周原,冯志海,等.2.5D机织复合材料压缩性能实验与数值模拟[J].复合材料学报,2015,32(1):150-159.LU Zixing,ZHOU Yuan,FENG Zhihai,et al.Experiment and numerical simulation on compressive properties of2.5Dwoven fabric composites[J].Acta Materiae Compositae Sinica,2015,32(1):150-159.(in Chinese)
[10]JOHN S,HERSZBERG I,COMAN F.Longitudinal and transverse damage taxonomy in woven composite components[J].Composites Part B:Engineering,2001,32(8):659-668.
[11]邱睿.2.5维编织复合材料疲劳寿命预测模型与分析方法研究[D].南京:南京航空航天大学,2014.QIU Rui.Research on fatigue life prediction and damage analysis of 2.5D woven composites[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2014.(in Chinese)
[12]单宏伟,周光明.2.5维机织复合材料疲劳寿命预测[J].玻璃纤维,2015(5):1-5.SHAN Hongwei,ZHOU Guangming.Fatigue life prediction for 2.5Dwoven composites[J].Fiber Glass,2015(5):1-5.(in Chinese)
[13]SELEZNEVA M,MONTESANO J,FAWAZ Z,et al.Microscale experimental investigation of failure mechanisms in off-axis woven laminates at elevated temperatures[J].Composites Part A:Applied Science and Manufacturing,2011,42(11):1756-1763.
[14]VIEILLE B,TALEB L.About the influence of temperature and matrix ductility on the behavior of carbon wovenply PPS or epoxy laminates:notched and unnotched laminates[J].Composites Science and Technology,2011,71(7):998-1007.
[15]KHAN R,KHAN Z,AL-SULAIMAN F,et al.Fatigue life estimates in woven carbon fabric/epoxy composites at nonambient temperatures[J].Journal of Composite Materials,2002,36(22):2517-2535.
[16]MONTESANO J,FAWAZ Z,BEHDINAN K,et al.Fatigue damage characterization and modeling of a triaxially braided polymer matrix composite at elevated temperatures[J].Composite Structures,2013,101(15):129-137.
[17]MONTESANO J,FAWAZ Z,POON C,et al.A microscopic investigation of failure mechanisms in a triaxially braided polyimide composite at room and elevated temperatures[J].Materials and Design,2014,53(1):1026-1036.
[18]TANABE Y,YOSHIMURA T,WATANABE T,et al.Fatigue of C/C composites in bending and in shear modes[J].Carbon,2004,42(8):1665-1670.
[19]MAHFUZ H,MANIRUZZAMAN M,KRISHNAGOPALAN J,et al.Effects of stress ratio on fatigue life of carbon-carbon composites[J].Theoretical and Applied Fracture Mechanics,1995,24(1):21-31.
[20]OZTURK A,MOORE R E.Tensile fatigue behaviour of tightly woven carbon/carbon composites[J].Composites,1992,23(1):39-46.