期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
MMM testing and failure analysis of fastening bolts on reciprocating compressor cylinder cover 被引量:3
1
作者 邢海燕 樊久铭 +1 位作者 徐敏强 李其 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第2期13-16,共4页
To avoid the serious accidents caused by the failure fastening bolts on reciprocating compressor cylinder cover,a new nondestructive testing(NDT) technology,metal magnetic memory(MMM) testing,was applied to safety eva... To avoid the serious accidents caused by the failure fastening bolts on reciprocating compressor cylinder cover,a new nondestructive testing(NDT) technology,metal magnetic memory(MMM) testing,was applied to safety evaluating and failure analyzing for the fastening bolts.Based on the dynamic stress calculation of the failure bolts,MMM testing was carried out at workshop.Given are the MMM stress distribution characteristics of the failure bolts and fracture faces.It has been found that the MMM signal variation amplitude of the crack transition zone in the fracture surface is minimal,that of the crack initiation zone is in the middle,and that of the tear fracture zone is maximal.The failure reasons were analyzed with MMM effect.The results of the metallographic examination showed that the validity and feasibility of MMM testing and failure analysis.This means MMM technology is a new,fast and validity method of failure analysis. 展开更多
关键词 metal magnetic memory testing fastening bolts failure analysis stress calculation
下载PDF
Anti-loosening performance of coatings on fasteners subjected to dynamic shear load 被引量:12
2
作者 Junbo ZHOU Jianhua LIU +3 位作者 Huajiang OUYANG Zhenbing CAI Jinfang PENG Minhao ZHU 《Friction》 SCIE CSCD 2018年第1期32-46,共15页
This paper investigates the self-loosening of threaded fasteners subjected to dynamic shear load. Three kinds of typical coatings, PTFE, MoS_2, and TiN applied to bolts and nuts, are tested in this investigation. The ... This paper investigates the self-loosening of threaded fasteners subjected to dynamic shear load. Three kinds of typical coatings, PTFE, MoS_2, and TiN applied to bolts and nuts, are tested in this investigation. The study experimentally examines the loosening mechanisms of fasteners and assesses the anti-loosening performance of the three tested coatings based on their tightening characteristics, loosening curves, and the damage of thread surface. Additionally, the anti-loosening performance of the three coatings is compared under different load forms. The results indicate that the PTFE and MoS_2 coatings have significant anti-loosening effect, whereas the anti-loosening performance of Ti N coating is not satisfactory. It is also found that an appropriate increase of the initial tightening torque can significantly improve the anti-loosening effect. In addition, the microscopic analyses of PTFE and MoS2 coating reveal that a reduced initial tightening torque leads to fretting wear on the thread contact surfaces of fasteners, thereby aggravating the damage. 展开更多
关键词 bolted fastener loosening curve fretting coating dynamic shear load
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部