PTFE膜材料的偏轴拉伸性能及破坏机理
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摘要
为深入把握PTFE膜材料的率相关力学性能及破坏机理,对3种常见的PTFE膜材料进行了偏轴拉伸试验,主要考虑了0°、5°、15°、25°、35°、45°、55°、65°、75°、85°、90°等11个偏轴角度和10、25、50、100、200、500 mm/min等6种拉伸速率,分析了主要力学参数的变化规律,研究了不同拉伸速率下的膜材破坏模式及破坏机理.结果表明:不同拉伸速率下膜材主要力学参数的变化规律比较一致,表现出明显的各向异性;材料的抗拉强度与破坏模式密切相关,随着拉伸速率的增加,抗拉强度逐渐升高,且与拉伸速率的对数呈近似线性关系,这主要与材料应变能及编织结构有关;材料的破坏模式和断裂延伸率受拉伸速率的变化影响不明显.
To understand the rate-dependent mechanical properties and failure mechanism,a series of uniaxial offaxial tensile tests were carried out to study the mechanical properties of three common PTFE( Poly tetra fluoro ethylene) coated fabrics under different tensile rates. The following parameters were considered in the tests including eleven in-plane directions( 0°,5°,15°,25°,35°,45°,55°,65°,75°,85°and 90°) and six tensile rates( 10 mm / min,25 mm / min,50 mm / min,100 mm / min,200 mm / min,and 500 mm / min). The variations of main mechanical parameters of PTFE coated fabrics were analyzed and the corresponding tensile failure modes and mechanisms were studied. The results show that the variations of main mechanical parameters are consistent under different tensile rates and it shows significant anisotropic characteristic. The tensile strength is strongly related with the failure modes. With tensile rate increasing,the tensile strength increases slightly while the strain at break decreases. The tensile strength shows good linear relationship with the tensile rate's logarithm,which is mainly related with the strain energy and the woven structure. The change of tensile rate has no significant effects on the material failure modes and the strain at break.
To understand the rate-dependent mechanical properties and failure mechanism,a series of uniaxial offaxial tensile tests were carried out to study the mechanical properties of three common PTFE( Poly tetra fluoro ethylene) coated fabrics under different tensile rates. The following parameters were considered in the tests including eleven in-plane directions( 0°,5°,15°,25°,35°,45°,55°,65°,75°,85°and 90°) and six tensile rates( 10 mm / min,25 mm / min,50 mm / min,100 mm / min,200 mm / min,and 500 mm / min). The variations of main mechanical parameters of PTFE coated fabrics were analyzed and the corresponding tensile failure modes and mechanisms were studied. The results show that the variations of main mechanical parameters are consistent under different tensile rates and it shows significant anisotropic characteristic. The tensile strength is strongly related with the failure modes. With tensile rate increasing,the tensile strength increases slightly while the strain at break decreases. The tensile strength shows good linear relationship with the tensile rate's logarithm,which is mainly related with the strain energy and the woven structure. The change of tensile rate has no significant effects on the material failure modes and the strain at break.
引文
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[2]张其林.索和膜结构[M].上海:同济大学出版社,2002.ZHANG Qilin.Cable and membrane structure[M].Shanghai:Tongji University Press,2002.
[3]王长国,谢军,谭惠丰.薄膜充气拱褶皱特性分析[J].哈尔滨工业大学学报,2013,45(3):66-69.WANG Changguo,XIE Jun,TAN Huifeng.Wrinkling characteristics analysis of inflated membrane arch[J].Journal of Harbin Institute of Technology,2013,45(3):66-69.
[4]FORSTER B,MOLLAERT M.European design guide for tensile surface structures[M].Brussel:Tensinet,2004.
[5]中国工程建设标准化协会标准.膜结构技术规程:CECS 158:2015[S].北京:中国计划出版社,2015.China engineering construction standardization association standard.Technical specification for membrane structures:CECS 158:2015[S].Beijing:China Planning Press,2015.
[6]张营营,张其林,吴明儿.膜材料性能及其对结构的影响[J].空间结构,2012,8(2):70-79.ZHANG Yingying,ZHANG Qilin,WU Minger.Material properties of membrane and its influence on structural behaviors[J].Spatial Structures,2012,18(2):70-79.
[7]CHLOE I,ERIC P,FRANCE S,et al.Modelling of UV optical ageing of optical fibre fabric coated with Ti O2[J].Applied Catalysis B:Environmental,2015,182:229-235.DOI:10.1016/j.apcatb.2015.09.037.
[8]BRIDGENS B N,BIRCHALL M J S.Form and function:The significance of material properties in the design of tensile fabric structures[J].Engineering Structures,2012,44:1-12.DOI:10.1016/j.engstruct.2012.05.044.
[9]DINH T D,REZAEI A,LAET L D,et al.A new elasto-plastic material model for coated fabric[J].Engineering Structures,2014,71:222-233.DOI:10.1016/j.engstruct.2014.04.027.
[10]ZHANG Yingying,SONG Xiaoguang,ZHANG Qilin,et al.Fracture failure analysis and strength criterion for PTFE-coated woven fabrics[J].Journal of Composite Materials,2015,49(12):1409-1421.DOI:10.1177/0021998314534706.
[11]易洪雷,丁辛,陈守辉.PES/PVC膜材料拉伸性能的各向异性及破坏准则[J].复合材料学报,2005,22(6):98-102.YI Honglei,DING Xin,CHEN Shouhui.Orthotropic behavior and strength criterion of PES/PVC membrane materials under tensile loading[J].Acta Materiae Compositae Sinica,2005,22(6):98-102.
[12]邹宗勇,韩建,刘杭锋,等.PVC建筑膜材拉伸异向性能研究[J].浙江理工大学学报,2010,27(2):186-191.ZOU Zongyong,HAN Jian,LIU Hangfeng,et al.Orthotropic behavior of PVC architectural membrance materials under tensile loading[J].Journal of Zhejiang Sci-tech University,2010,27(2):186-191.
[13]AMBROZIAK A.Mechanical properties of Precontraint 1202S coated fabric under biaxial tensile test with different load ratios[J].Construction and Building Materials,2015,80:210-224.DOI:10.1016/j.conbuildmat.2015.01.074.
[14]孟雷,吴明儿.建筑用PTFE膜材应力松弛和徐变性能研究[J].建筑材料学报,2012,15(2):206-211.MENG Lei,WU Minger.Study on stress relaxation and creep properties of PTFE membrane[J].Journal of Building Materials,2012,15(2):206-211.
[15]吴明儿,慕仝,刘建明.拉伸速度对ETFE薄膜力学性能的影响[J].建筑材料学报,2008,11(5):574-579.WU Minger,MU Tong,LIU Jianming.Influence of tensile rate on mechanical properties of ETFE foils[J].Journal of Building Materials,2008,11(5):574-579.
[16]上海市工程建设规范.膜结构检测技术规程:DG/TJ 08-2019—2007[S].上海:[s.n.],2007.Shanghai engineering construction standard.Technical specification for inspection of membrane structures:DG/TJ 08-2019—2007[S].Shanghai:[s.n.],2007.
[17]周改丽.加载速率影响系缆合成纤维拉伸力学性能的机理研究[D].天津:天津大学,2012.ZHOU Gaili.The mechanism research of loading rateon the tensile mechanical properties of mooring synthetic fiber[D].Tianjin:Tianjin University,2012.
[18]郑开宏,李林,苏志辉,等.加载速率对Csf/LAS复合材料断裂特性的影响[J].广东有色金属报,2001,11(1):51-55.ZHENG Kaihong,LI Lin,SU Zhihui,et al.The effect of loading rate on the fracture characteristic of Csf/LAS composite[J].Journal of Guangdong Non-ferrous Metals,2001,11(1):51-55.
[19]方钦志,李慧敏,欧阳小东.加载速率对PC/ABS拉伸性能的影响[J].高分子材料科学与工程,2006,22(1):131-134.FANG Qinzhi,LI Huimin,OUYANG Xiaodong.Effect of loading rate on the tensile properties of PC/ABS[J].Polymer Materials Science and Engineering,2006,22(1):131-134.
[20]傅政.高分子材料强度及破坏行为[M].北京:化学工业出版社,2005.FU Zheng.Strength and fracture behavior of polymers[M].Beijing:Chemical Industry Press,2005.