Experimental and Numerical Analysis of the Fastening Bolt Using the Plastic Buckling Deformation of a Pipe

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A one-sided fastening bolt using the plastic buckling of a pipe which is annealed along the length is studied in this paper. In fastening process the pipe is buckled to form a buckling head in the annealed area under an axial compressive load and the formed buckling head can be used as the backside head of the bolt. Since the pipe geometry is the single design variable for the strength of fastening bolt, estimations of effects of the geometry parameters of the pipe on the fastening process are very important. The whole fastening process is studied by the nonlinear finite element analysis consistently. Effects of the pipe length on the deformation and the load in the fastening process are investigated for two different diameter pipes. The buckling experiment and the fastening experiment are carried out to verify the simulation method proposed. Numerical results are compared with experimental results for the deformation and the load in the buckling step and the fastening step, showing fairly good coincidence. Three different types of deformation modes in the fastening process are found in the analyses and experiments. Under the mode which has a large area to contact the bolt head, the higher fastening strength is obtained.