考虑应力集中的吊车梁多轴疲劳寿命预测

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (1): 44-48.

考虑应力集中的吊车梁多轴疲劳寿命预测

李斌¹, 李维敦¹, 郎珊珊^*2, 李亚楠²

1.甘肃建筑职业技术学院建筑工程系, 甘肃兰州 730050;
2.兰州理工大学机电工程学院, 甘肃兰州 730050

收稿日期:2022-05-25 出版日期:2023-02-28 发布日期:2023-03-21
通讯作者: 郎珊珊(1979-),女,山东淮坊人,博士,副教授. Email:langshsh@lut.edu.cn
基金资助:
甘肃省科技计划项目自然科学基金(21JR7RA783),甘肃省教育厅青年博士基金(2021QB-139)

Multiaxial fatigue life prediction of crane beams considering stress concentration

LI Bin¹, LI Wei-dun¹, LANG Shan-shan², LI Ya-nan²

1. Department of Architectural Engineering, Gansu Vocational and Technical College of Architecture, Lanzhou 730050, China;
2. School of Mechanical and Electrical Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2022-05-25 Online:2023-02-28 Published:2023-03-21

摘要/Abstract

摘要： 钢结构吊车梁在工业建筑中被广泛应用,应力集中的存在导致几何不连续位置在复杂应力下服役.借助有限元法分析吊车梁应力-应变状态,确定危险点位置,并提取应力、应变分量;以应变能密度作为损伤参量并以最大平面为临界面,基于能量准则建立临界面位置数值计算方法,结合有限元结果给出吊车梁临界面位置;考虑吊车梁在非对称载荷下服役,借助Goodman方程进行平均应力修正,并结合Q355D钢近似S-N曲线计算疲劳寿命.该方法考虑了应力集中处多轴应力对疲劳损伤的影响,可以为复杂应力下几何不连续钢构件的疲劳寿命评估提供新方法.

关键词: 吊车梁, 多轴应力, 疲劳寿命预测, 近似S-N曲线, 有限元法

Abstract: Steel structure crane beams have been widely used in industrial buildings. Due to the existence of stress concentration, parts of crane beams with geometric discontinuity are in service under multiaxial stress. In this paper, finite element method is used to analyze the stress and strain state of crane beam, determine the position of dangerous point, and extract its stress and strain component. Taking the plane with the highest energy density as the critical plane, a method to determine the critical plane based on energy criterion is proposed. Given that the crane beam works under asymmetric load, with the help of Goodman equation of mean stress correction, the fatigue life of crane beam is calculated by combining the approximate S-N curve of Q355D steel. The proposed method considers the effect of the multiaxial stress near the region of stress concentration on the fatigue damage and provides a new method for fatigue life evaluation of steel members with geometric discontinuous under complicated stress.

Key words: crane beam, multiaxial stress, fatigue life prediction, approximate S-N curve, the finite element method

中图分类号:

TU391

李斌, 李维敦, 郎珊珊, 李亚楠. 考虑应力集中的吊车梁多轴疲劳寿命预测[J]. 兰州理工大学学报, 2023, 49(1): 44-48.

LI Bin, LI Wei-dun, LANG Shan-shan, LI Ya-nan. Multiaxial fatigue life prediction of crane beams considering stress concentration[J]. Journal of Lanzhou University of Technology, 2023, 49(1): 44-48.

参考文献

[1] 郭华泾,崔鹏飞,吴佰建,等.既有工业厂房钢吊车梁疲劳性能预后分析 [J].哈尔滨工业大学学报,2019,51(6):109-115.
[2] 赵晓青,岳清瑞,幸坤涛.钢吊车梁直角式突变支座插入板端部疲劳性能研究 [J].建筑结构学报,2020,41(8):116-123.
[3] 郑廷银.钢吊车梁变截面支座的疲劳性能研究 [J].建筑结构,1997(6):9-12.
[4] 钱友荣,田永江,唐林.高强度钢静拉伸的缺口效应 [J].北京航空学院学报,1985,3:158-165.
[5] 赵晓青,岳清瑞,郭小华,等.钢吊车梁疲劳评估欠载效应的等效系数法研究 [J].建筑结构学报,2021,1:179-188.
[6] LIU J H,HUA F L,LANG S S,et al.Evaluation of fatigue strength on multiaxial notched specimens considering failure probability [J].International Journal of Fatigue,2022,156:106649.
[7] ALBINMOUSA J,ADINOYI M J,MERAH N.Multiaxial low-cycle-fatigue of stainless steel 410 alloy under proportional and non-proportional loading [J].International Journal of Pressure Vessels and Piping,2021,192:104393.
[8] TAO Z Q,ZHANG M,ZHU Y,et al.Notch fatigue life prediction considering non-proportionality of local loading path under multiaxial cyclic loading [J].Fatigue and Fracture of Engineering Materials and Structures,2020,43(1):92-109.
[9] 金甲,张书明,李五一,等.缺口件p-S-N曲线的随机有限元法与试验应用 [J].机械工程学报,2018,54(10):117-123.
[10] ZHENG M L,LI P,YANG J G,et al.Fatigue life prediction of high modulus asphalt concrete based on the local stress-strain method [J].Applied Sciences-Basel,2017,7(3):1-17.
[11] 张小元.Q235 钢多轴低周疲劳寿命及评估方法研究 [D].南宁:广西大学,2013.
[12] 金丹,田大将,缑之飞,等.一种疲劳缺口系数计算新方法 [J].应用力学学报,2015,32(2):271-275,355.
[13] 黄传海,刘志平.止裂孔与CFRP复合修复含裂纹钢结构的疲劳性能 [J].机械强度,2021,2:418-424.
[14] 刘俭辉,华飞龙,段红燕,等.考虑应力梯度及附加强化的多轴疲劳寿命预测 [J].华中科技大学学报(自然科学版),2021,49(9):59-63,71.
[15] LIU J H,ZHANG R L,WEI Y B,et al.A new method for estimating fatigue life of notched specimen [J].Theoretical and Applied Fracture Mechanics,2018,93:137-143.