1.Key Laboratory of Advanced Forging Technology and Science,Ministry of Education, Yanshan University, Qinhuangdao,Hebei,066004
2.Key Laboratory of Special Transport Equipment,Yanshan University, Qinhuangdao,Hebei,066004
3.Hebei Innovation Center for Equipment Lightweight Design and Manufacturing, Qinhuangdao,Hebei,066004
Abstract:The AA5052 aluminum alloy extruded tube was used as inner base tube, the Q235 carbon structure steel coil welded tube was used as outer cladding steel/aluminum composite tube, and the particle media bulging behavior of the composite tubes was studied. The influences of tangential friction forces between tubes and the normal pressures on the stress of the base tubes during the bulging processes were analyzed through plastic theory. Numerical simulation was used to analyze the comprehensive influences of the friction coefficients between tubes and the anisotropy of the coated tubes on the strain forming limit of the base tubes. In addition, the wall thickness reduction of the single tubes and composite tubes and the stress and strain distribution of the base tubes during the bulging were given. Through the high-pressure bulging tests in the tube granular medium, limit bulging ratios of aluminum alloy tubes were compared under single tube and composite tube bulging conditions. The deformation compatibility of the composite tubes was analyzed. Results show that by applying Q235 carbon structural steel clad tubes, the bidirectional tensile stresses are reduced at the middle section of the bulging zones of the AA5052 base tubed, the wall thickness reduction of the base tube bulging zones is decreased, and the bulging ratio is increased by 22%. The maximum thinning rate of the base tubes under the composite tube is as 17.5%. The forming performance is significantly improved.
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