蚀坑尺寸对高强钢绞线应力集中影响研究  

Study on Effect of Pit Size on Stress Concentration of High Strength Steel Strand

作　　者：程海根[1] 王文峰 CHENG Hai-gen;WANG Wen-feng(School of civil engineering and architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《太原科技大学学报》2024年第2期217-222,共6页Journal of Taiyuan University of Science and Technology

基　　金：国家自然科学基金(51968024);江西省自然科学基金(20202BABL204059)。

摘　　要：使用有限元软件ABAQUS 6.14-1建立1860级七丝高强钢绞线的实体模型,并在其上预设蚀坑,针对应力集中现象做仿真分析。通过改变半圆球蚀坑和三轴椭球体蚀坑的尺寸参数,研究其对应力集中的影响,并在椭球蚀坑中综合比较长宽深对高强钢绞线应力集中系数的影响程度。结论如下:在半圆球蚀坑中,逐步增大半径尺寸,应力集中系数也随之增大。在蚀坑半径较小的时候,增长速度较快,当尺寸增大到一定值后,增长速度变缓。在椭球蚀坑中,长度增加,应力集中系数随之不断减小,而宽度和深度增加,应力集中系数则随之增大,对各尺寸变化所对应的应力集中系数进行拟合,都表现出明显的线性关系。其中,深度对应力集中影响最大,而宽度因子和长度因子差异不大。对比蚀坑对钢丝的影响规律并结合吊杆疲劳试验结果,验证了模型的可靠性。In this paper,the solid model of 1860 grade seven wire high-strength steel strand is established by using the finite element software ABAQUS,and the corrosion pit is preset on it to simulate and analyze the phenomenon of stress concentration.By changing the size parameters of semi-circular spherical corrosion pit and triaxial ellipsoid corrosion pit,the influence of its corresponding stress concentration is studied,and the influence of length,width and depth on the stress concentration factor of high-strength steel strand is comprehensively compared in the ellipsoidal corrosion pit.The conclusions are as follows:in the semi-circular spherical corrosion pit,the stress concentration factor increases with the gradual increase of radius size.When the pit radius is small,the growth rate is faster,and when the size increases to a certain value,the growth rate slows down.In the ellipsoidal corrosion pit,the stress concentration factor decreases with the increase of length,while the stress concentration factor increases with the increase of width and depth.Fitting the stress concentration factor corresponding to each size change shows an obvious linear relationship.Among them,depth has the greatest influence on stress concentration,while there is little difference between width factor and length factor.The reliability of the model is verified by comparing the influence law of corrosion pit on steel wire and combined with the fatigue test results of suspender.

关 键 词：高强钢绞线 蚀坑 应力集中 模拟分析 

分 类 号：TU503[建筑科学—建筑技术科学]