scholarly journals Reliability assessment of buckling strength for imperfect stiffened panels under axial compression

2015 ◽  
Vol 42 (12) ◽  
pp. 1040-1048
Author(s):  
O. Mouhat ◽  
A. Khamlichi ◽  
A. Limam
Keyword(s):  
Axial Compression ◽  
Reliability Assessment ◽  
Stiffened Panels ◽  
Buckling Strength

RELIABILITY ASSESSMENT OF AXIALLY COMPRESSED COMPOSITE CYLINDRICAL SHELLS WITH RANDOM IMPERFECTIONS

2011 ◽  
Vol 11 (02) ◽  
pp. 215-236 ◽  
Author(s):  
MATTEO BROGGI ◽  
ADRIANO CALVI ◽  
GERHART I. SCHUËLLER
Keyword(s):  
Mathematical Models ◽  
Axial Compression ◽  
Cylindrical Shells ◽  
Reliability Assessment ◽  
Buckling Analysis ◽  
Buckling Load ◽  
Experimental Results ◽  
Drastic Decrease ◽  
Different Types ◽  
Probability And Statistics

Cylindrical shells under axial compression are susceptible to buckling and hence require the development of enhanced underlying mathematical models in order to accurately predict the buckling load. Imperfections of the geometry of the cylinders may cause a drastic decrease of the buckling load and give rise to the need of advanced techniques in order to consider these imperfections in a buckling analysis. A deterministic buckling analysis is based on the use of the so-called knockdown factors, which specifies the reduction of the buckling load of the perfect shell in order to account for the inherent uncertainties in the geometry. In this paper, it is shown that these knockdown factors are overly conservative and that the fields of probability and statistics provide a mathematical vehicle for realistically modeling the imperfections. Furthermore, the influence of different types of imperfection on the buckling load are examined and validated with experimental results.

Effect of pitting defects on the buckling strength of thick-wall cylinder under axial compression

2019 ◽  
Vol 224 ◽  
pp. 226-241 ◽  
Author(s):  
Huakun Wang ◽  
Yang Yu ◽  
Jianxing Yu ◽  
Weipeng Xu ◽  
Haicheng Chen ◽  
...  
Keyword(s):  
Axial Compression ◽  
Thick Wall ◽  
Buckling Strength

Buckling Strength of Pressurized Cylindrical Shells under Axial Compression

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.

Measurement of residual stresses and distortions in stiffened panels

1977 ◽  
Vol 12 (2) ◽  
pp. 107-116 ◽  
Author(s):  
W L Somerville ◽  
J W Swan ◽  
J D Clarke
Keyword(s):  
Residual Stresses ◽  
Elastic Strain ◽  
Welded Structures ◽  
Stiffened Panels ◽  
Buckling Strength ◽  
Ship Hulls ◽  
Future Design ◽  
Design Calculations ◽  
Initial Results

Methods for measuring residual stresses and distortions in welded structures are described and initial results are given of a survey being carried out during manufacture of warship hull sections. The stresses are determined by measuring the elastic strain induced in the plate and stiffeners due to contraction of the stiffener welds, and profiles of the stiffener and plating after welding have been obtained. The survey is intended to provide information for use in future design calculations of the buckling strength of ship hulls.

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

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.

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