Experiment on the rebound phenomenon of small slenderness ratio hydraulic tie bolt
WANG Yinchao
SU Haopeng
LI Shaolin
SHI Duoqi
QI Hongyu
CHEN Qingsen
Abstract：To the phenomenon that the actual pre tightening force and initial pre tightening force of small slenderness ratio hydraulic bolts are different before and after assembly,a rebound test of small slenderness ratio bolt assembly was designed to study the effects of different initial pre tightening force sizes,pre tightening times,different small slenderness ratio,and different bolt materials on the rebound coefficient of small slenderness ratio bolts.The empirical value of the rebound coefficient of bolts was analyzed and compared it with the experimental results.The results shows that the small slenderness ratio bolts will experience significant rebound when pre tightened using a hydraulic tensioner;The rebound coefficient of bolted connections is inversely proportional to its slenderness ratio and is independent of the initial preload force within the elastic range;The more times of preloading,the smaller the rebound coefficient is,and the rebound coefficient tends to be stable after 4 times of preloading,which is 5%lower than 1 time of tightening.The rebound coefficient of bolt material GH4169 is 4%～8%larger than that of 2Cr12MoV.
Keywords：small slenderness ratio bolthydraulic tie boltrebound phenomenontightening boltbolt preload
Publication Date：2025-01-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 44-48 )