Q690D和Q460D钢板对接焊缝的疲劳寿命计算
PDF下载 (300)黄益洲,王万祯,李草原.Q690D和Q460D钢板对接焊缝的疲劳寿命计算[J].宁波大学学报(理工版),2022,35(3):32-37.DOI:
HUANG Yizhou,WANG Wanzhen,LI Caoyuan.Fatigue life calculation of butt weld of Q690D and Q460D steel plates[J].Journal of Ningbo University(Natural Science & Engineering Edition),2022,35(3):32-37.DOI:
| Title: | Fatigue life calculation of butt weld of Q690D and Q460D steel plates |
| 作者: | 黄益洲, 王万祯, 李草原 |
| Author(s): | HUANG Yizhou, WANG Wanzhen, LI Caoyuan |
| 关键词: | 高强钢板; 对接焊缝; 疲劳寿命计算模型; 疲劳裂纹; 稳定扩展 |
| Keywords: | high strength steel plate; butt weld; fatigue life calculation model; fatigue crack; stable propagation |
| 分类号: | TU391 |
| 文献标识码: | A |
| 摘要: | 采用新近提出的统一计及疲劳裂纹形成寿命和稳定扩展寿命的结构钢疲劳寿命计算模型, 对Q690D和Q460D钢板对接焊缝疲劳试验进行疲劳寿命计算. 假设高强钢板对接焊缝的疲劳裂纹起裂于对接焊缝边缘, 沿板宽扩展且穿透板厚, 可将高强钢板对接焊缝疲劳断裂面积A分为疲劳裂纹稳定扩展面积Af和失稳扩展面积An(即名义最大应力作用下的净截面强度拉断面积). 以结构钢的椭球面断裂模型为判据, 由高强钢板对接焊缝疲劳裂纹的裂尖真实应力场解得高强钢板对接焊缝疲劳裂纹的失稳扩展面积An、稳定扩展面积Af和稳定扩展长度af. 计算结果表明 不同屈服强度下的高强钢板对接焊缝的疲劳寿命相差较大, 应采用各自量化的疲劳寿命计算式; 本文量化的结构钢疲劳寿命计算式对Q690D和Q460D钢板对接焊缝疲劳试验寿命的计算误差为-63.9%~-0.2%, 而现行规范建议的疲劳寿命计算式的计算误差为-70.7%~68.0%; 本文量化的结构钢疲劳寿命计算式的计算精度高于规范建议的疲劳寿命计算式, 前者计算结果对所有试件均偏于安全, 后者计算结果对部分试件偏于不安全, 且部分试件过于保守. |
| Abstract: | The test fatigue life of butt weld of Q690D and Q460D steel plates was calculated by using a newly proposed fatigue life calculation model of structural steel, which takes into account the fatigue crack forming life and stable growth life. It is assumed that the fatigue crack of butt weld of high strength steel plates starts from the edge of butt weld and propagates along the width of plate and penetrates the thickness of plate. The fatigue fracture area A of butt weld of high strength steel plates was divided into two parts the stable propagation area Af of fatigue crack and the unstable propagation area An of fatigue crack (i.e. the tensile fracture area under the nominal maximum stress). The instability propagation area An, stable propagation area Af and stable propagation length af of fatigue crack of butt weld of high strength steel plates were calculated according to the true stress field of fatigue crack tip by using an elliptical fracture model of constructional steel as fracture criterion. The calculation results show that the fatigue life of butt weld of high strength steel plates with different yield strength is quite different, and should be calculated by their own quantitative fatigue-life formula. The calculation error of the quantitative fatigue life calculation formula in this paper is -63.9% – -0.2% for the fatigue life of butt weld of Q690D and Q460D steel plates, while the calculation error of fatigue life formula recommended by current code is -70.7% – 68.0%. The calculation accuracy of the quantitative fatigue life calculation formula in this paper is higher than that recommended by current code. The former is safe for all specimens, while the latter is unsafe for some specimens and too conservative for others. |
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| 备注/Memo: | 收稿日期:2021-03-04.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:浙江省基础公益技术研究计划（LGF18E080007）. 第一作者:黄益洲（1997－）,男,浙江台州人,在读硕士研究生,主要研究方向:钢结构.E-mail:936961204@qq.com *通信作者:王万祯（1974－）,男,河南周口人,博士/教授,主要研究方向:钢结构断裂与疲劳.E-mail:wangwanzhen1975@sina.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
