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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年03期

页码:

83-90

栏目:

出版日期:

2019-05-22

文章信息/Info

Title:

Effect of Pitting Corrosion on Low Cycle Fatigue Behavior of Structural Steels

文章编号:

1673-2049(2019)03-0083-08

作者:

沈玲华^1,2,3,AMOAKO-ATTA Godwin¹,王 彤²

(1. 浙江科技学院 土木与建筑工程学院,浙江 杭州 310023; 2. 浙江大学 建筑工程学院,浙江 杭州 310058; 3. 浙江大学 浙江省空间结构重点实验室,浙江 杭州 310058)

Author(s):

SHEN Ling-hua^1,2,3, AMOAKO-ATTA Godwin¹, WANG Tong²

(1. School of Civil Engineering and Architecture, Zhejiang University of Science & Technology, Hangzhou 310023, Zhejiang, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China; 3. Zhejiang Provincial Key Laboratory of Space Structures, Zhejiang University, Hangzhou 310058, Zhejiang, China)

关键词:

钢材;  坑蚀;  低周疲劳;  循环空穴扩张模型;  等效塑性应变

Keywords:

steel;  pitting corrosion;  low cycle fatigue;  cyclic void growth model;  equivalent plastic strain

分类号:

TU391

DOI:

-

文献标志码:

A

摘要:

为研究坑蚀对钢材低周疲劳性能的影响,以中国常用的结构钢材Q345为例,通过有限元分析并基于微观断裂判据循环空穴扩张模型(CVGM),对坑蚀钢材试件进行低周疲劳断裂预测,并通过与完好试件的结果对比,分析了蚀坑对钢材低周疲劳寿命的影响机理。在此基础上,研究了蚀坑的几何特征、分布形式以及荷载的应变幅等因素对钢材低周疲劳寿命的影响规律。结果表明:由于蚀坑断裂起始点等效塑性应变的加倍累积,与均匀锈蚀相比,蚀坑的存在更显著地改变了钢材的应力分布,进而降低其低周疲劳寿命,降低幅度可达50%以上; 蚀坑深度和直径分别达到截面宽度的5%和厚度的20%以上时,断裂起始点的等效塑性应变随蚀坑深度增大而增加,低周疲劳寿命相应减小; 多蚀坑试件的低周疲劳寿命总体上比单蚀坑试件明显降低,降幅为20%～30%; 随应变幅增大,坑蚀对钢材低周疲劳性能的影响逐渐增大; 基于强度等效原则的等效厚度设计方法无法反映坑蚀对钢材低周疲劳性能的影响。

Abstract:

In order to investigate the effect of pitting corrosion on the low fatigue behavior of steel, the commonly used structural steel Q345 in China was taken as example. Through finite element analysis and based on the micromechanical fracture criteria of cyclic void growth model(CVGM), the low fatigue fracture initiation of the pitting corrosion steel specimens was predicted, and the results were compared with those of intact specimens to explore the effect mechanism of pitting on low cycle fatigue life of steels. On the basis, the effects of the geometrical characteristics, distribution and strain amplitude of the pits on the low cycle fatigue life of steel were studied. The results show that in comparison with uniform corrosion, pitting corrosion can obviously change the stress distribution of steel, and further significantly reduce the low cycle fatigue life of steel by more than 50%, which mainly due to the multiply accumulation of equivalent plastic strain at the fracture initiation points in the pits. When the depth and diameter of pit reach 5% of the width and 20% of the thickness of the section, respectively, the equivalent plastic strain at the fracture initiation points in the pits increases with increasing of pit depth, and the low cycle fatigue life decreases accordingly. Besides, the low cycle fatigue life of multi-pit specimens is significantly lower by 20%-30% than that of single pit ones. Furthermore, as the strain amplitude increases, the effect of pitting corrosion on the low cycle fatigue properties of steel increases gradually. The equivalent thickness design method based on strength equivalence principle can not reflect the effect of pitting on low cycle fatigue properties of steel.

参考文献/References:

[1] GE H B,LUO X Q.A Seismic Performance Evaluation Method for Steel Structures Against Local Buckling and Extra-low Cycle Fatigue[J].Journal of Earthquake and Tsunami,2011,5(2):83-99.
[2]GE H B,KANG L.Ductile Crack Initiation and Propagation in Steel Bridge Piers Subjected to Random Cyclic Loading[J].Engineering Structures,2014,59:809-820.
[3]PAIK J K,LEE J M,KO M J.Ultimate Compressive Strength of Plate Elements with Pit Corrosion Wastage[J].Journal of Engineering for the Maritime Environment,2003,217(4):185-200.
[4]PAIK J K,LEE J M,KO M J.Ultimate Shear Strength of Plate Elements with Pit Corrosion Wastage[J].Thin-walled Structures,2004,42(8):1161-1176.
[5]NAKAI T,MATSUSHITA H,YAMAMOTO N,et al.Effect of Pitting Corrosion on Local Strength of Hold Frames of Bulk Carriers(1st Report)[J].Marine Structures,2004,17(5):403-432.
[6]NOURI Z H M E,KHEDMATI M R,SADEGHIFARD S.An Effective Thickness Proposal for Strength Evaluation of One-side Pitted Steel Plates Under Uniaxial Compression[J].Latin American Journal of Solids and Structures,2012,9(4):475-496.
[7]KOLIOS A,SRIKANTH S,SALONITIS K.Numerical Simulation of Material Strength Deterioration Due to Pitting Corrosion[J].Procedia CIRP,2014,13:230-236.
[8]RAJABIPOUR A,MELCHERS R E.A Numerical Study of Damage Caused by Combined Pitting Corrosion and Axial Stress in Steel Pipes[J].Corrosion Science,2013,76:292-301.
[9]潘骁宇,谢 旭,李晓章,等.锈蚀高强度钢丝的力学性能与评级方法[J].浙江大学学报:工学版,2014,48(11):1917-1924.
PAN Xiao-yu,XIE Xu,LI Xiao-zhang,et al.Mechanical Properties and Grading Method of Corroded High-tensile Steel Wires[J].Journal of Zhejiang University:Engineering Science,2014,48(11):1917-1924.
[10]徐善华,曾桃桃,孔正义.腐蚀对Q235钢疲劳性能影响的试验研究[C]//崔京浩.第21届全国结构工程会议论文集第Ⅲ册.北京:工程力学杂志社,2012:159-162.
XU Shan-hua,ZENG Tao-tao,KONG Zheng-yi. Study on the Fatigue Properties for Corrosion Q235 Steel[C]//CUI Jing-hao.Proceedings of the 21st National Conference on Structural Engineering Volume Ⅲ.Beijing:Engineering Mechanics Press,2012:159-162.
[11]谢 旭,唐站站,胡欣科,等.纤维模型在钢拱桥抗震设计中的适用性研究[J].中国公路学报,2015,28(2):33-42.
XIE Xu,TANG Zhan-zhan,HU Xin-ke,et al.Study on Applicability of Fiber Model in Seismic Design for Steel Arch Bridge[J].China Journal of Highway and Transport,2015,28(2):33-42.
[12]TANG Z Z, XIE X,WANG Y,et al.Investigation of Elasto-plastic Seismic Response Analysis Method for Complex Steel Bridges[J].Earthquakes and Structures,2014,7(3):333-347.
[13]TANG Z,XIE X,WANG T,et al.Study on FE Models in Elasto-plastic Seismic Performance Evaluation of Steel Arch Bridge[J].Journal of Constructional Steel Research,2015,113:209-220.
[14]TATEISHI K,HANJI T,MINAMI K.A Prediction Model for Extremely Low Cycle Fatigue Strength of Structural Steel[J].International Journal of Fatigue,2007,29(5):887-896.
[15]KANVINDE A M,DEIERLEIN G G.Cyclic Void Growth Model to Assess Ductile Fracture Initiation in Structural Steels Due to Ultra Low Cycle Fatigue[J].Journal of Engineering Mechanics,2007,133(6):701-712.
[16]KANVINDE A M,DEIERLEIN G G.Validation of Cyclic Void Growth Model for Fracture Initiation in Blunt Notch and Dogbone Steel Specimens[J].Journal of Structural Engineering,2008,134(9):1528-1537.
[17]LIAO F F,WANG W,CHEN Y Y.Parameter Calibrations and Application of Micromechanical Fracture Models of Structural Steels[J].Structural Engineering and Mechanics,2012,42(2):153-174.

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备注/Memo

备注/Memo:

收稿日期:2019-01-14
基金项目:国家自然科学基金项目(51708506); 浙江省空间结构重点实验室开放基金项目(201702)
作者简介:沈玲华(1988-),女,浙江德清人,浙江科技学院讲师,工学博士,E-mail:116033@zust.edu.cn。

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更新日期/Last Update: 2019-05-23