ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Analysis of Process Parameters Influencing Protuberance During Interference Fit Installation of Hi-lock Bolts
Received date: 2012-05-21
Revised date: 2012-08-21
Online published: 2013-04-23
Supported by
National Natural Science Foundation of China (51275463); Natural Science Foundation of Zhejiang Province (Y1090572); Fundamental Research Funds for the Central Universities of China (2011FZA4002) *Corresponding author. Tel.: 0571-87953929 E-mail: donghuiyue@zju.edu.cn
Interference fit is an effective process method for improving the fatigue life of bolted joints, but the protuberance produced in installation is harmful to the strength of joints. The causes of protuberance arising are analysised, and then reports a squeezing installation test of titanium alloy M8 hi-lock bolts. A finite element model (FEM) is developed and the process of installation is simulated. The experimental squeezing force and protuberance sizes are compared with the results from finite element analysis (FEA) to validate the FEM. Several process parameters are analyzed. The FEA results indicate that the best interference fit size is 1.5%,when the diameter of the bucking bar central hole is slightly smaller than twice the bolt diameter, the protuberance is relatively small. The friction coefficient should be less than 0.15, and 0.2×120°chamfer around the hole exit side can reduce protuberance and stress concentration.
JIANG Jiefeng , DONG Huiyue , BI Yunbo . Analysis of Process Parameters Influencing Protuberance During Interference Fit Installation of Hi-lock Bolts[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(4) : 936 -945 . DOI: 10.7527/S1000-6893.2013.0154
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