| 杨世聪,姚国文,张劲泉,史康.加速盐雾环境中钢绞线的腐蚀疲劳特征[J].材料导报,2018,32(12):1988-1993 |
| 加速盐雾环境中钢绞线的腐蚀疲劳特征 |
| The Corrosion Fatigue Characteristic of Steel Strand Experiencing an Artificial Accelerated Salt Fog Ageing |
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| DOI：10.11896/j.issn.1005-023X.2018.12.009 |
| 中文关键词: 拉吊索 钢绞线 人工加速盐雾环境 交变应力 静态应力 无应力 |
| 英文关键词: suspension cable, steel strand, artificial accelerated salt fog environment, alternating stress, static stress, non-stress |
| 基金项目:国家自然科学基金(51478071)；交通运输部建设科技项目(2015318814190)；重庆市基础与前沿研究计划重点(cstc2015jcyjB0014) |
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| 中文摘要: |
| 为探究钢绞线在不同加载条件下的腐蚀疲劳,采用千斤顶与盐雾试验箱相结合的方式,模拟了钢绞线在交变应力、静态应力和无应力状态下的腐蚀。首先通过定量直方图的方法分析了三种加载条件下钢绞线的腐蚀程度,然后针对腐蚀后的钢绞线试样展开了腐蚀形态、力学性能的分析。结果表明:在相同腐蚀时间内,交变应力工况下试件的腐蚀程度最大,其次是静态应力工况,而无应力工况下的腐蚀程度最小。在一定的腐蚀时间内,腐蚀时长对钢绞线最大拉力的影响不明显,但腐蚀超过360 h后,不同加载状况下抗拉强度的变化趋势存在一定的差异。腐蚀时间短于360 h时断裂强度无太大变化,随后不同工况下的试件断裂强度出现分化,尤其是在交变应力工况下,试件的断裂强度下降很大(个别试件在腐蚀时间为720 h的工况下,断裂强度仅为1 200 MPa左右)。交变应力工况的断后伸长率下降特别明显,其次是静态应力工况,无应力工况的断后伸长率也呈下降趋势,但与前二者相比变化最小。 |
| 英文摘要: |
| To explore the corrosion fatigue characteristics of steel strand used for suspension cable under different loadings, the present work conducted a corrosion test for the steel strand under the artificially simulated conditions of alternating stress, static stress and non-stress, through the combinative apparatus of jack and salt fog test box. We first determined the steel strand’s corrosion states by means of quantitative histogram analysis, then launched the morphological and mechanical measurement after corrosion. Our experiment confirmed the steel strand’s corrosion extent sequence (experienced the same corrosion duration) with respect to the above mentioned three conditions:alternating stress condition, static stress condition and non-stress condition correspond to the high, intermediate and low corrosion extents, respectively. The corrosion duration, within a certain range, has an inconspicuous influence on the steel strand’s ultimate tensile stress, but while the corrosion progresses to more than 360 h, different loading conditions would lead to the diversity of the tensile strength’s variation trend. Also, only slight changes were observed in the fracture strength of the steel strand with a corrosion duration of less than 360 h, and thereafter the differentiation of fracture strengths emerges, with a particularly large decline of fracture strength under the alternating stress condition (individual specimen exhibits a fracture strength of only about 1 200 MPa after 720 h corrosion). It can also be indicated that the alternating stress and static stress result in pronounced decreases in the elongation at break of the corroded steel strand, the former of which holds a distinctly greater extent. The elongation at break with respect to the steel strand experienced salt fog corrosion under the non-stress condition also declines, but its change is relatively small compared to alternating stress and static stress. |
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