Test and numerical analysis of slip loosening of stud under transverse cyclic loading
ZHAO Zhenlong
QI Tonghui
SUN Yu
QIN Wenjie
ZHUANG Shijun
WANG Lan
Abstract：[Objective]Micro slip will occur at contact interfaces in threaded connection structures under transverse cyclic loading,causing looseness,damaging the performance of the system,and even leading to serious safety accidents.Taking the tightly threaded stud connection structure under transverse cyclic loading as the research object,the slip behavior of its contact interface was investigated by means of testing and finite element simulation,which can provide support for the reliability design of threaded connection structures.[Methods]A self-driven sensor based on the principles of triboelectric nanogenerators was used to measure the rotational slip displacement of the nut and monitor the loosening of the stud.The finite element simulation was conducted to simulate the contact slips in the stud connection structure under transverse cyclic loads,and the slip behaviors of the nut bearing surface and the thread contact surfaces in the threaded connection structure under several different amplitude cyclic loads were investigated.[Results]The results indicate that the nut bearing surface experienced complete slip,while the thread surface in contact with the lower connecting part only experienced local slip.All contact surfaces of the partial thread turns exhibited overslip at different moments within one load cycle,i.e.,creep slip.As the number of load cycles increased,the number of thread turns that experienced creep slip would increase.Under the same preloading force,the larger the amplitude of transverse cyclic load,the earlier the whole threaded surface became creep slipping,and the faster the stud loosened.
Keywords：Threaded connection structureContact slipLoosenessTestFinite element method
Publication Date：2026-02-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 120-125 )