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2013•Acta Aeronautica Et Astronautica SinicaRequires access

Analysis of Process Parameters Influencing Protuberance During Interference Fit Installation of Hi-lock Bolts

Yunbo Bi

Open publisher page 5 citations

Abstract

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.

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What this paper is about

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.

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Available abstract

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.

Key concepts: Chamfer (geometry), Finite element method, Interference fit, Structural engineering, Process (computing), Lock (firearm), Bar (unit), Engineering

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Analysis of Process Parameters Influencing Protuberance During Interference Fit Installation of Hi-lock Bolts — Research Paper | ScholarLens