盐度对聚丙烯疲劳性能的试验研究

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英文篇名：Experimental Study of Salinity on Fatigue Performance of Polypropylene 作者：宋科 ; 王文全 ; 刘国寿 ; 王时越 英文作者：SONG Ke;WANG Wen-quan;LIU Guo-shou;WANG Shi-yue;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology; 关键词：聚丙烯 ; 盐度 ; 裂纹扩展速率 ; 疲劳性能 ; 阻裂效应 英文关键词：Polypropylene;;Salinity;;Crack Growth Rate;;Fatigue Property;;Crack Resistance Effect 中文刊名：SLGY 英文刊名：China Plastics Industry 机构：昆明理工大学建筑工程学院; 出版日期：2019-02-20 出版单位：塑料工业 年：2019 期：v.47;No.381 基金：国家自然科学基金(51479085,11262008);; 霍英东青年基金资助项目(141120) 语种：中文; 页：SLGY201902030 页数：5 CN：02 ISSN：51-1270/TQ 分类号：113-117

摘要

为了研究聚丙烯在不同盐度水环境与循环荷载耦合作用下的疲劳裂纹扩展特性及机理,采用疲劳试验机捕捉裂纹扩展(MTS)、电镜扫描断面(SEM)相结合的方法对两种聚丙烯材料(共聚聚丙烯,无机纳米碳酸钙聚丙烯)进行三点弯曲Ⅰ型裂纹的疲劳试验测试。结果表明,两种聚丙烯材料在三种盐度水环境下裂纹扩展至一定范围时均出现明显的阻裂效应,而一旦通过阻裂效应点后裂纹的扩展将沿着稳定线性阶段、失稳快速阶段及最终断裂的方向发展。与空气中相比,盐度的增大对两种聚丙烯初始裂纹扩展速率影响明显,而当裂纹扩展至稳定线性阶段后盐度的增大对扩展速率的影响很小。通过电镜扫描发现,两种聚丙烯断面沿扩展方向均出现一定程度的水解与腐蚀。总的来说,盐度对两种聚丙烯材料疲劳性能影响不大。
        In order to study the fatigue crack growth characteristics and mechanism of polypropylene( PP) under the coupling action of different salinity water environment and cyclic load,the fatigue testing system( MTS) was used to capture the crack growth and the scanning electron microscopy( SEM) was used to scan the fracture section of the three-point bending I crack mode of two kinds of polypropylenes materials( co-pdypropylene,nano calcium carbonate polypnpylene). The study show that there are obvious crack resistance effects for both PP materials, when the crack grows to a certain range in three salinity water environments. And after reaching the crack resistance effect point,the crack would continue to develop along the direction of stable linear stage, fast instability stage and final fracture stage. Comparing with the air environment test,the effect of salinity is more obvious on the initial crack growth rate of two PPs. However,the stable linear stage and subsequent stage are rarely affected by salinity increasing. Furthermore,it is found that hydrolysis and corrosion could occur along the crack growth direction of the fracture section of two polypropylenes by SEM. Generally speaking,salinity has little effect on the fatigue property of the two polypropylenes.

引文

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