Plastic buckling of circular tubes under axial compression—part II: Analysis

The analysis of part I is extended to deal with the case of free-edged rectangular plates having an initial curvature about an axis parallel to one pair of opposite edges and loaded by distributed bending moments applied to the straight edges and compressive forces applied to the curved edges. In particular, the stability and post-buckling behaviour of such plates subjected to the compressive forces alone is studied. The axially symmetrical buckling of thin-walled circular tubes in axial compression is also considered. Experimental plates are found to buckle at loads rather lower than those predicted.

Download Full-text

Plastic Buckling and Collapse Under Axial Compression

Mechanics of Offshore Pipelines ◽

10.1016/b978-008046732-0/50011-8 ◽

2007 ◽

pp. 280-318 ◽

Cited By ~ 4

Author(s):

Stelios Kyriakides ◽

Edmundo Corona

Keyword(s):

Axial Compression ◽

Plastic Buckling

Download Full-text

Buckling Strength of Pressurized Cylindrical Shells under Axial Compression

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.638-640.1750 ◽

2014 ◽

Vol 638-640 ◽

pp. 1750-1753

Author(s):

Yu Chao Zheng ◽

Yang Yan ◽

Pei Jun Wang

Keyword(s):

Numerical Simulation ◽

Internal Pressure ◽

Axial Compression ◽

Parametric Study ◽

Shell Thickness ◽

Steel Shell ◽

Plastic Buckling ◽

Buckling Strength ◽

Elastic Plastic ◽

Steel Strength

A systematic parametric study was carried out to investigate the elastic and elastic-plastic buckling behaviors of imperfect steel shell subject to axial compression and internal pressure. Studied parameters include the magnitude of internal pressure, steel strength, and ratio of cylinder radius to shell thickness. Design equations were proposed for calculating the elastic and elastic-plastic buckling strength of imperfect steel shells under combination of axial compression and internal pressure. The buckling strength predicated by proposed equations agrees well with that from the numerical simulation.

Download Full-text

Development of the Buckling Evaluation Method for Large Scale Vessel by the Testing of Gr. 91 Vessel Subjected to Vertical and Horizontal Loading

Volume 1: Codes and Standards ◽

10.1115/pvp2020-21328 ◽

2020 ◽

Author(s):

Takashi Okafuji ◽

Kazuhiro Miura ◽

Hiromi Sago ◽

Hisatomo Murakami ◽

Masanori Ando ◽

...

Keyword(s):

Axial Compression ◽

Power Plants ◽

Base Isolation ◽

Vertical Load ◽

Plastic Buckling ◽

Buckling Strength ◽

Shear Buckling ◽

Grade 91 ◽

Seismic Base Isolation ◽

Grade 91 Steel

Abstract Larger-diameter cylindrical vessels for commercial fast breeder reactors (FBRs) are planned to increase the electric generation capacity with thinner vessels compared to the existing ones. The modified 9Cr-1Mo steel (ASME Grade 91 steel) has high yield stress and low tangent modulus after yielding, and plans to be applied as well as austenitic stainless steel for vessels in existing FBR power plants. Although elasto-plastic axial compression, bending and shear buckling are expected to occur in vessels, the current buckling strength evaluation from the Japan Society of Mechanical Engineers (JSME) standard “Design and Construction for Nuclear Power Plants, Division 2 Fast Reactors” mainly focuses on plastic buckling of thick cylindrical vessels. Seismic base isolation is being devised for next-generation FBR power plants by the increasing seismic design load in Japan. When a horizontal seismic base isolation design is adopted, cylindrical vessels are subject to cyclic vertical seismic load with long-period horizontal seismic wave. The deformation by cyclic vertical load reduces the buckling strength. In this paper, we modified the existing buckling strength equations focusing on elasto-plastic axial compression, bending and shear buckling under cyclic axial load (hereinafter called “modified equations”), and confirmed their applicability through a series of elasto-plastic buckling analyses. We also conducted a series of buckling tests on Grade 91 steel vessels in the load regions where axial compression, bending and shear buckling interact, and where axial compression and bending buckling are dominant due to large vertical load. The buckling behavior and the buckling load estimated by the elasto-plastic buckling analysis considering the actual material stress–strain relationship and imperfections in the test vessel suitably agreed with corresponding test results in the load regions.

Download Full-text

Interactive Buckling of Q420 Welded Circular Tubes under Axial Compression

Advances in Materials Science and Engineering ◽

10.1155/2020/4028907 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Bin Huang ◽

Zhou Che Hong

Keyword(s):

Residual Stresses ◽

Axial Compression ◽

Test Data ◽

Local Buckling ◽

Ultimate Capacity ◽

Geometric Imperfection ◽

Circular Tubes ◽

Limit Value ◽

Buckling Resistance ◽

Interactive Buckling

Finite element models (FE models) of high-strength steel Q420 (yield strength 420 MPa) circular tubes considering residual stresses and local and overall geometric imperfections were established and verified against existing test data. Based on parameter analysis, it was derived that the reduction of ultimate capacity resulting from residual stresses was up to 11.8%. When slenderness ratio was larger than 25, the effect of overall geometric imperfection played a major role compared with that of local geometric imperfection, which resulted in the reduction of the ultimate capacity of about 11.5%. Through tracking the failure process, it was found that, in the initial stage of loading, the deformation of columns mainly presents overall bending. When the load increased near the ultimate load, local buckling occurred and the bearing capacity decreased rapidly. The D/t limit value 27 was determined for preventing the local buckling, and the overall slenderness λl limit value 40 was proposed to distinguish whether local buckling occurs. Based on the FEM result and test data, the applicability of ASCE48-05 and AS4100 for local buckling resistance was evaluated. Continuing the result of stub columns, curve a in GB50017-2017 and in Eurocode 3 of the overall buckling factor φ was proposed to be used in EWM and DSM for estimating the interactive buckling resistance of circular tubes of Q420 under axial compression.

Download Full-text