PTFE膜材力学性能及抗力不定性分析

发布时间：2018-06-13 04:07

本文选题：PTFE(聚四氟乙烯)膜材 + 破坏机理　；参考：《建筑材料学报》2014年04期

【摘要】：对PTFE膜材的基本力学性能进行了试验研究,分析了膜材的拉伸破坏机理;进行了膜材的抗力不定性分析,研究了循环拉伸、温度、损伤、接缝连接、人工加速老化等对PTFE膜材拉伸性能的影响规律.结果表明:膜材的经向断裂延伸率小于纬向断裂延伸率,经向抗拉强度略大于纬向抗拉强度;随着温度的升高,膜材拉伸强度逐渐减小;不同温度下搭接膜材接缝拉伸强度能够达到母材拉伸强度的90%以上;损伤膜材的拉伸强度有明显的折减,折减程度同取样位置、折叠次数有直接关系;循环应力幅较大时,经循环拉伸后的膜材拉伸曲线更接近线性;人工加速老化使膜材的拉伸强度有一定程度的折减,但并不明显.
[Abstract]:The mechanical properties of PTFE membrane were studied experimentally, the tensile failure mechanism of membrane material was analyzed, the resistance of membrane material was not qualitatively analyzed, and the cyclic tension, temperature, damage and joint connection were studied. Effects of artificial accelerated aging on tensile properties of PTFE films. The results show that the elongation at meridional break of the membrane is smaller than that at the latitudinal fracture, and the meridional tensile strength is slightly larger than that of the zonal tensile strength, and the tensile strength decreases with the increase of temperature. At different temperature, the tensile strength of the joint can reach more than 90% of the tensile strength of the base metal, and the tensile strength of the damaged membrane is obviously reduced, and the degree of reduction is directly related to the sampling position and the folding times, and when the cyclic stress amplitude is larger, the tensile strength of the damaged membrane is obviously reduced. The tensile curve of the membrane after cyclic stretching is closer to the linearity, and the tensile strength of the membrane is reduced to a certain extent by artificial accelerated aging, but it is not obvious.
【作者单位】：中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室;同济大学土木工程学院;山东省建筑科学研究院;
【基金】：国家自然科学基金资助项目(51308532,90815003) 中国博士后科学基金资助项目(2013M541756) 江苏省博士后科研基金资助计划项目(1301034B)
【分类号】：TU599

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