Sensitivity analysis of the IACS-CSR buckling strength requirements for stiffened panels

2016 ◽  
pp. 459-470
Author(s):  
B Gaspar ◽  
A Teixeira ◽  
C Soares
Keyword(s):  
Sensitivity Analysis ◽  
Stiffened Panels ◽  
Buckling Strength

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.

scholarly journals Buckling/post-buckling strength of friction stir welded aircraft stiffened panels

2012 ◽  
Vol 228 (2) ◽  
pp. 178-192 ◽  
Author(s):  
A Murphy ◽  
T Ekmekyapar ◽  
M Özakça ◽  
K Poston ◽  
G Moore ◽  
...  
Keyword(s):  
Stiffened Panels ◽  
Buckling Strength ◽  
Friction Stir ◽  
Post Buckling

Assessment of IACS-CSR implicit safety levels for buckling strength of stiffened panels for double hull tankers

2011 ◽  
Vol 24 (4) ◽  
pp. 478-502 ◽  
Author(s):  
B. Gaspar ◽  
A.P. Teixeira ◽  
C. Guedes Soares ◽  
G. Wang
Keyword(s):  
Stiffened Panels ◽  
Buckling Strength ◽  
Double Hull

On Buckling and Ultimate Strength of Perforated Plate Panels under Axial Compression: Experimental and Numerical Investigations with Design Formulations

2008 ◽  
Author(s):  
Ul-Nyeon Kim ◽  
Ick-Heung Choe ◽  
Jeom Kee Paik
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Steel Plate ◽  
Slenderness Ratio ◽  
Plate Thickness ◽  
Shipbuilding Industry ◽  
Perforated Plates ◽  
Stiffened Panels ◽  
Buckling Strength ◽  
Plate Panels

It has been recognized that the current shipbuilding industry design practice for perforated plates is not relevant with relatively large opening size and/or with large plate thickness, and it is believed that this problem has caused structural damage accidents in actual ship structures with opening. The motive of the present study was initiated to resolve this issue by introducing a new design formulation of the critical buckling strength for perforated plates which is now pertinent to the structural design application at a safety side. For this purpose, a series of experimental and numerical studies are undertaken on buckling and ultimate strength of plates and stiffened panels with an opening and under axial compressive actions. A total of 90 perforated plates and also a total of 9 stiffened panels with an opening are tested until and after the ultimate strength is reached, where important parameters of influence such as the plate aspect ratio, the plate slenderness ratio, the opening size and shape, and the opening location are varied. Elastic-plastic large deflection finite element analyses are performed on the test structures. Existing and newly-derived design formula solutions of buckling and ultimate strength on the test plate panels are compared with experimental results and nonlinear finite element computations, indicating that the critical buckling strength formulation developed in the present study as well as an existing ultimate strength formula is useful for design and strength assessment of steel plate panels with an opening. The experimental database on buckling collapse of steel plate panels with an opening will be very useful for future use. Details of experiments and numerical computations together with insights developed from the present study are documented.

Background to DNV Recommended Practice DNV-RP-C201 Buckling Strength of Plated Structures

2004 ◽  
Author(s):  
Gunnar Solland ◽  
Pa˚l Georg Jensen
Keyword(s):  
Structural Reliability ◽  
Cost Effective ◽  
Biaxial Compression ◽  
Strength Analysis ◽  
Shear Stresses ◽  
Research Activity ◽  
Stiffened Panels ◽  
Buckling Strength ◽  
Plate Elements ◽  
Jack Up

The new DNV Recommended Practice on Buckling of Plated Structures (RP-C201) was issued in October 2002. It supersedes the plate part of the widely used DNV Classification Notes 30.1 on Buckling Strength Analysis. The RP covers unstiffened plate elements as well as orthogonal stiffened panels. The recommendations cover both in plane biaxial compression stresses and shear stresses as well as lateral pressure (hydrostatic pressure) even if acting simultaneously. The RP is part of the new series of DNV offshore standards and is intended for design of structures like semi-submersibles, topside structures, FPSOs jack-up rigs etc. The 2004 revision of the Norsok N-004 code will make reference to the RP-C201 with regard to buckling of stiffened plates. The RP is developed on the basis of continuous research activity at DNV within the field of buckling of plated structures for the last 30 years. Feed back from users of Classification Note 30.1 has also been an important element in the development. The result is a new set of design recommendations that leads to more cost effective structures and a more consistent level of structural reliability. This paper describes main features of the RP and the principles for the design checks. It presents the range of application and the background for the various recommendations. Also included are comparisons to other codes and laboratory test.

Buckling Strength of Damaged Stiffened Panels

2011 ◽  
Author(s):  
Diogo do Amaral Amante ◽  
Segen F. Estefen
Keyword(s):  
Numerical Models ◽  
Strength Loss ◽  
Correlation Study ◽  
Small Scale ◽  
Failure Behavior ◽  
Geometric Imperfection ◽  
Stiffened Panels ◽  
Shell Elements ◽  
Buckling Strength ◽  
Parametric Studies

Numerical and experimental simulations for small scale damaged stiffened panels are performed. Six small scale stiffened panels were fabricated following special techniques to keep them in accordance with usual tolerances related to initial geometric imperfections due to fabrication. Ultimate buckling strength analyses were carried out in order to perform a correlation study to adjust the numerical model for further use in parametric studies. The damage was imposed with a local indentation on the panels. Measurements of the geometric imperfection distributions and damage shapes were accomplished using the equipment laser tracker. It is a portable contact measurement equipment that uses laser technology with sub-millimeter accuracy. The numerical models are represented by shell elements assuming finite membrane strains and large rotations, considering both geometric and material nonlinearities. The aim of the work is to study the failure behavior up to and beyond buckling to evaluate the strength loss due to the damage imposed to the panel. Additionally, some numerical simulations of damaged stiffened panels were performed. In these analyses the damage was done with explicit nonlinear finite element code from ABAQUS program. Therefore the distortions and the residual stresses due to the damage are both considered in subsequent compression analysis.

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