Loosening-resistance evaluation of double-nut tightening method and spring washer by three-dimensional finite element analysis

Partially open crack model for leakage pressure analysis of bolted metal-to-metal flange

“…Some of these studies have focused on the tightening process [36] and the bolt-up sequence of a flanged connection [37,53]. The stiffness of bolted joints was investigated in [54][55][56][57][58] and the bolt self-loosening was examined in [59][60][61]. Recent analyses of flanged joints have proposed FE simulations to investigate the contact pressure distributions between the two flange mating surfaces [2,10,62].…”

Research on Bolt Connection Loose Mechanism under Dynamic combination load

“…The technical route is shown in Fig.2. Qualitative and quantitative evaluation criterion of bolt connection loosening are given as follows, referring to the reference documents [1,6,7].…”

“…For example, the American scholar Hess [1][2][3][4][5] points out that the if there is localized slide on the bolt, the bolt can be loose under relatively minor shearing action; the Japanese scholar Satoshi Izumi [6] believes the spring shim may accelerate the nut loosening; the Germany scholar G.Dinger [7] puts forward an idea that the localized slip on the contact area of screw head may also cause the bolt loosening; the American scholar Jiang Y [8][9][10][11] recommend that the main reason of bolt loosening is the stress redistribution and deformation of ratchet effect caused by local plastic deformation effected by the initial pre-tightening force. However, the domestic scholar Luo Chuanxi [12] proposes that the fundamental reason of bolt loosening is the alternatively positive and negative frequent variations of the bending torque and the torque, while the important reason of the bolt loosening lies in the actual installed pretightening force which can't meet the requirement; another domestic scholar Kong Xiangwei [13] suggests that when the bolt is under the limit load, there might be small displacement of the bolt which is in the bolt holes and under the long-term reciprocating load, the nut may become loose gradually; the scholar Yangming [14] [6][7] figures out that the accumulative sliding under the cyclic loading causes the bolt looseness. In this paper, the loosening of the bolt connection under dynamic tension compression and shear load is studied by applying the virtual prototype technology and the finite element analysis method.…”

Self-Loosening Failure Analysis of Bolt Joints under Vibration considering the Tightening Process

“…However the transmission of force and displacement on the interface is achieved by the interpolation, which results in low accuracy, critical discontinuous stress, and even incorrect high stress at some nodes. The other approach treats the bolt body and the threads as a whole part, which can be meshed only by tetrahedron [9,10,21,22]. Unfortunately, a tetrahedron is less accurate and more time-consuming in calculation, compared with the hexahedral mesh.…”