Study on high temperature attenuation behavior of bolts with short clamping ratio
CHEN Qingsen
YANG Luyu
LI Shaolin
SHI Duoqi
QI Hongyu
WANG Yinchao
Abstract：A large number of bolt connections are used in the horizontal mid-section of gas turbine cylinder structure,which are usually fixed by short clamping ratio bolts.However,due to the high ambient temperature,the creep deformation of the bolt material aggravates the relaxation of the bolted connection structure.Especially for short clamping ratio bolts,the clamping force attenuation may be more significant,affecting the load transfer at the connection site.An experimental study on the influence of temperature on the high temperature attenuation behavior of the short clamping ratio bolt of a gas turbine cylinder was carried out.The results show that un-der the same load,the higher the ambient temperature is,the faster the attenuation rate of bolt clamping force is,and the higher the temperature is,the smaller the residual clamping force is.For short clamping ratio bolts with a clamping ratio of 2.0,the attenuation percentage of clamping force at high temperature under service environment ranges from 18.28％to 22.37％.The research results can provide data reference and theoretical support for the design requirements of short clamping specific bolt clamping force and the design of cylinder bolts under the same working conditions.
Keywords：gas turbineshort clamping ratio boltbolt high temperature testattenuation of clamping force
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 49-54 )