scholarly journals Analysis of the Post-Critical Deformation State of Curvilinear Integral Stiffening of a Thin-Walled Structure Subjected to Torsion

2020 ◽  
Vol 14 (2) ◽  
pp. 34-40
Author(s):  
Tomasz Kopecki
Keyword(s):  
Critical Deformation ◽  
Deformation State ◽  
Curvilinear Integral ◽  
Thin Walled

Welding Residual Distortions in Ring-Stiffened Pipes

1996 ◽  
Vol 118 (2) ◽  
pp. 121-126
Author(s):  
B. L. Josefson ◽  
L. O. Wikander ◽  
J. F. Hederstierna ◽  
F. K. Johansson
Keyword(s):  
Expert System ◽  
Residual Deformation ◽  
Angular Distortion ◽  
Simple Method ◽  
Knowledge Based ◽  
Deformation State ◽  
Thin Walled Pipe ◽  
Thin Walled ◽  
Ring Stiffener

A fast and simple method for the determination of the residual deformation for a class of welding problems, ring-stiffened pipes, is proposed. The method can predictradial as well as angular distortion of the thin-walled pipe-ring-stiffener/flange assembly. The pipe and stiffener material is elasto-plastic. In particular, the accumulation of deformation in multipass welding is incorporated in the model. Each weld pass is treated separately. This facilitates the assessment of the influence of the sequence in which the weld passes are deposited on the residual deformation state. The method will be included in a conversational knowledge-based “expert” system for the production of a welded ring-stiffened pipe.

scholarly journals Investigation of the stress-deformation state of a bolt-joint assembly of cold-bent thin-walled profiles

Vestnik MGSU ◽  
2019 ◽  
pp. 831-843 ◽  
Author(s):  
Ivan L. Kuznetsov ◽  
Marat A. Salakhutdinov ◽  
Rishat G. Gainetdinov
Keyword(s):  
Computer Simulation ◽  
Sheet Steel ◽  
Full Scale ◽  
Gusset Plates ◽  
Gusset Plate ◽  
Flat Wall ◽  
Deformation State ◽  
Stress Deformation ◽  
Thin Walled ◽  
Full Scale Tests

Introduction: cold-bent profiles with a segment of the concave flat wall are used for manufacturing trusses. In these trusses, the connection between the chords and the webbing is made using gusset plates attached with bolts. Due to the shape of these profiles, the bolts can only be installed in two outer rows. While the profile wall at the place of flat concavity cannot be tightly connected with the gusset plate, so the actual work of such joints is to be studied. The aim of the study is numerical and experimental research of the stress-deformation state of the attachment of a cold-bent thin-walled profile with a segment of the concave flat wall using two rows of bolts. Materials and methods: paired cold-bent profiles with a segment of the concave flat wall connected utilizing bolted gusset plate were used for full-scale tests. Computer simulation and calculation were performed using the SolidWorks software. An examination of the assembly with two rows of bolts was carried out. Results: calculations and full-scale tests of the bolted assembly showed the variation of the forces in the bolts and profiles. It is suggested to eliminate the gap between the walls of cold-bent profiles and gusset plates that allows installing an increased number of bolt rows and reducing stresses in the thin-walled profile of the joint. Conclusions: the results of the study showed that the installation of only two rows of bolts in the joint of thin-walled profiles with a segment of the concave flat wall worsens their stress-deformation state. When filling the concave segment of the wall with sheet steel pieces, it is possible to increase the number of bolt rows and reduce the number of the bolts, increasing the bearing capacity of the cold-bent thin-walled profile and the joint as a whole.

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