Abstract
In order to study the effect of different bolts tightening sequences on the stress of bolts work-piece, the finite element simulation and stress test experiments are adopted. Three types of bolt work-piece: two, five, and frame type bolts work-pieces are studied under different tightening sequences. The stress values and distribution are obtained under different tightening sequences by simulation. It is observed that the stress distribution tendency of bolts work-piece has little change under different tightening sequences. It also notices that the tightening sequences have no effect on two bolts work-piece due to the symmetry of work-piece. In five bolts work-piece, the variation range of stress under tightening from ends to middle is smaller than that under sequence tightening, which indicates that better stress uniformity is obtained under tightening from ends to middle in five bolts work-piece. Similarly, in frame bolts work-piece, the variation range of stress under symmetrical tightening is smaller than that under sequence tightening, which indicates that better stress uniformity is obtained under symmetrical tightening in frame type bolts work-piece. Furthermore, the experimental results are in good agreement with the simulation results. Moreover, the stress variation mechanism is revealed by analyzing residual preload variation under sequence tightening.
Highlights
The bolt connection, a common connection mode, is widely applied in machine tools, aerospace, automobile, and other fields [1,2,3]
Three types of bolt work-piece: two bolts, five bolts, and frame type bolts work-piece are studied under different tightening sequences
In the cross-sectional view of two bolts work-piece, it can be found that the stress value of the point located between two bolts is less than that located on the bolts
Summary
The bolt connection, a common connection mode, is widely applied in machine tools, aerospace, automobile, and other fields [1,2,3]. Fukuoka et al [7, 8] studied the assembly process of pipe flange bolt connection by finite element simulation calculation. Chen et al [10, 11] established the finite element model of long plate bolt group connection by using nonlinear contact, and studied the influence of bolt tightening sequence on the residual pre-tightening force of bolts. In study of assembly performance of a gasket bolted flanged pipe joint using different bolt tightening strategies, it is concluded that the bolt scatter cannot be eliminated using torque control method, but can be reduced within acceptable level by proper bolt up sequence and multiple pass tightening [12]. A general multi-bolts elastic interaction with bolt stress relaxation was modeled analytically to take elastic interaction
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