Study on the Influence of Initial Tightening Times on the Loosening Behavior of Bolt Connections

ZHANG Jiaqiang, QIAO Yan, SUN Jianfei, YI Hongwen, HE Tao, LIU Jianhua, ZHU Minhao

doi:10.16577/j.issn.1001-1560.2025.0086

Materials Protection >

2025 , Vol. 58 >Issue 5: 146 - 152

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0086

Study on the Influence of Initial Tightening Times on the Loosening Behavior of Bolt Connections

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(1.China Railway Kunming Group Co.， Ltd.， Kunming 654100， China；2.CRRC Nanjing Puzhen Co.， Ltd.， Nanjing 210000， China；3.Key Laboratory of Advanced Technology for Materials of Ministry of Education， Southwest Jiaotong University， Chengdu 610031， China)

LIU Jianhua (1987－)，Ph.D.，Associate Professor，Research Focus:Material Service Behavior and Safety Evaluation， Tel.:13708188050， E-mail: jianhua-liu＠swjtu.edu.cn

Received date: 2024-10-08

Revised date: 2025-02-10

Accepted date: 2025-02-12

Online published: 2025-06-10

Supported by

National Natural Science Foundation of China (52075460； U2141212)； Fundamental Research Funds for the Central Universities (2682022CX043)

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Abstract

In response to thread stripping and damage in the locomotive-bogie threaded holes， wire thread inserts were applied to repair the internal threads， and the post-repair loosening behaviour of the bolted structures was investigated.After the experiment， the feasibility of using wire thread inserts to repair damaged threaded holes was explored.Optical microscopy(OM) and scanning electron microscopy (SEM) were used to analyze surface damage in the internal threads after different tightening times.Results showed that damage to the internal threads intensified and anti-loosening performance deteriorated as the number of tightening times increased.Fatigue wear and abrasive wear were identified as the main wear mechanisms on the thread surface.Micro-sliding and fretting at the thread contact interface were identified as the primary causes of bolt-connection loosening.Damaged threaded holes were repaired with wire thread inserts， enabling their continued reuse.

Key words： threaded connections; tightening times; loosening behavior; fretting wear; wire thread inserts

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ZHANG Jiaqiang, QIAO Yan, SUN Jianfei, YI Hongwen, HE Tao, LIU Jianhua, ZHU Minhao . Study on the Influence of Initial Tightening Times on the Loosening Behavior of Bolt Connections[J]. Materials Protection, 2025 , 58(5) : 146 -152 . DOI: 10.16577/j.issn.1001-1560.2025.0086

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