[1]焦晋峰,刘展翔,刘 丹,等.预紧力缺失对8.8级M24高强度螺栓常幅疲劳性能影响分析[J].西安建筑科技大学学报(自然科学版),2022,(01):35-44.[doi:10.15986/j.1006-7930.2022.01.005 ]
 JIAO Jinfeng,LIU Zhanxiang,LIU Dan,et al.Analysis of the influence of the pre-tension loss on the constant-amplitude fatigue performance of grade 8.8 M24 high-strength bolts[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2022,(01):35-44.[doi:10.15986/j.1006-7930.2022.01.005 ]
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预紧力缺失对8.8级M24高强度螺栓常幅疲劳性能影响分析()
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西安建筑科技大学学报(自然科学版)[ISSN:1006-7930/CN:61-1295/TU]

卷:
期数:
2022年01期
页码:
35-44
栏目:
出版日期:
2022-02-28

文章信息/Info

Title:
Analysis of the influence of the pre-tension loss on the constant-amplitude fatigue performance of grade 8.8 M24 high-strength bolts
文章编号:
1006-7930(2022)01-0035-10
作者:
焦晋峰1刘展翔1刘 丹1刘 勇2郭 琪1雷宏刚1
(1.太原理工大学 土木工程学院,山西 太原 030024; 2.山东电力工程咨询院有限公司,山东 济南 250013)
Author(s):
JIAO Jinfeng1LIU Zhanxiang1LIU Dan1LIU Yong2GUO Qi1LEI Honggang1
(1.College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2.Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250013, China)
关键词:
高强度螺栓 预紧力 常幅疲劳 应力集中 断口分析
Keywords:
high-strength boltpre-tension forceconstant amplitude fatiguestress concentrationfracture analysis
分类号:
TU391
DOI:
10.15986/j.1006-7930.2022.01.005
文献标志码:
A
摘要:
针对3组应力比分别为0.3、0.5、0.8共24个材质为35K的8.8级M24高强度螺栓进行常幅疲劳试验和数值模拟,基于试验结果建立其相应的S-N曲线,并选取典型高强度螺栓疲劳断口进行宏观和微观分析,重点探讨了高强度螺栓预紧力缺失对其常幅疲劳性能的影响.分析结果表明:相同应力比和应力幅的一组螺栓,对应预紧扭矩变化100 N·m,其2×106次循环对应允许疲劳强度相差11.35%; 疲劳断口特征与预紧力大小明显相关,疲劳断口表面、扩展区和瞬断区范围随着预紧力增大,断口颜色变暗、扩展区范围扩大且瞬断区粗糙度加深; 高强度螺栓应力集中位置和大小受预紧力值影响较小,但与常幅疲劳试验断口位置基本吻合; 有无加荷装置对高强度螺栓应力大小影响明显,对应最大应力差值先减小后趋于稳定.
Abstract:
Constant amplitude fatigue test and numerical simulation were carried out on three groups of 24 specimens of grade 8.8 M24 high-strength bolts made of 35K under the stress ratios of 0.3, 0.5 and 0.8. The corresponding S-N curves were established based on the test results, and typical fractured high-strength bolts were selected for macro and micro fractography analysis, mainly focusing on the influence of the pre-tension loss on the constant amplitude fatigue performance. The analysis results show that: for one group of bolts under the same stress ratio and stress amplitude corresponding to the pre-tension torque change of 100 N·m, the difference between the allowable fatigue strengths at 2×106 cycles is 11.35%; the characteristics of fatigue fractured surfaces are obviously related to the pre-tension force, and with the increase of the pre-tension, the color of the fatigue fractured surface darkens, the area of the extension zone expands, and the roughness of the instantaneous fracture zone deepens; The location and magnitude of stress concentration of high-strength bolts are less affected by the pre-tightening, while the location generally agrees with the constant amplitude fatigue fracture location; the presence and absence of the loading device have a significant influence on the stress of the high-strength bolt, and the corresponding maximum stress difference first decreases and then tends to stabilize.

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相似文献/References:

[1]刘秀丽,王 燕.中美欧高强度螺栓外伸端板连接设计方法比较[J].西安建筑科技大学学报(自然科学版),2012,(01):41.[doi:10.15986/j.1006-7930.2012.01.007]
 LIU Xiu-li,WANG Yan.Study on design methods of extended end-plate connection accordingto norms of China,America and Europe[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2012,(01):41.[doi:10.15986/j.1006-7930.2012.01.007]

备注/Memo

备注/Memo:
收稿日期:2021-06-17修改稿日期:2022-01-06
基金项目:国家自然科学基金项目(51708384); 山西省留学人员科技活动择优资助项目(DC1900000602); 山西省基础研究青年基金项目(201901D211017)
第一作者:焦晋峰(1979—),男,博士,副教授,硕士生导师,主要研究方向为钢结构节点疲劳与断裂.E-mail: jiaojinfeng@tyut.edu.cn

更新日期/Last Update: 2022-02-20