Analyses of preload variations in aeroengine rotor bolted connections

ZHAO Bing; ZHANG Shouyang; WANG Hui

doi:10.16511/j.cnki.qhdxxb.2020.22.035

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (10) : 1144-1151. DOI: 10.16511/j.cnki.qhdxxb.2020.22.035

MECHANICAL ENGINEERING

Analyses of preload variations in aeroengine rotor bolted connections

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Abstract

The preload consistency of bolted connections plays an important role in ensuring the safety operation of aeroengine rotors. A model was developed here for the torsional tension relationship with a self-locking torque of closing to improve bolt tightening control of flanged joints of aeroengine rotor assemblies. The model was used to investigate the influence of changes introduced by the self-locking torque attenuation for various processing conditions. Tests were then used to verify the model. The results show that the remained self-locking torque is reduced by repeated use of the tightening nut resulting in some loss of the preload on the flange. In addition, the lubrication conditions greatly impact the preload. Also, repeated use of the tightening nuts changes the preload along a known trend and different batches of bolts have different preloads. This study shows the key factors affecting the consistency of preloads of aeroengine rotor bolted connections and how to accurately evaluate the preload variations caused by each factor as a reference for optimizing the bolt processing.

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aeroengine / bolted connection / process differences / preloads / variations

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ZHAO Bing, ZHANG Shouyang, WANG Hui. Analyses of preload variations in aeroengine rotor bolted connections[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(10): 1144-1151 https://doi.org/10.16511/j.cnki.qhdxxb.2020.22.035

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