scholarly journals ELASTIC BUCKLING STRENGTH OF STEEL SANDWICH PANELS UNDER OUT-OF-PLANE BENDING

2017 ◽  
Vol 82 (733) ◽  
pp. 475-483
Author(s):  
Kikuo IKARASHI ◽  
Toru INABA
Keyword(s):  
Sandwich Panels ◽  
Elastic Buckling ◽  
Buckling Strength ◽  
Out Of Plane ◽  
Plane Bending

Comprehensive strength analysis of framed sandwich panels

1979 ◽  
Vol 6 (4) ◽  
pp. 514-522 ◽  
Author(s):  
S. Rizzo ◽  
P. Fazio
Keyword(s):  
Sandwich Panels ◽  
Strength Analysis ◽  
Local Instability ◽  
Test Programme ◽  
Thin Aluminum ◽  
Out Of Plane ◽  
Edge Conditions ◽  
Plane Bending

Local instability of thin facings in sandwich panels often leads to wrinkling at stresses lower than yield stresses. An investigation was carried out by the authors on the behaviour of the facings of rectangular sandwich panels having thin aluminum faces and styrofoam core when subjected to edgewise compression and (or) out-of-plane bending. A set of the panels had no additional reinforcement at the edges whereas others were either totally or partially reinforced with wood framing integrated along the edges. Existing formulae developed to predict these stresses were found to overestimate results obtained from a test programme conducted by the authors. New expressions are presented for wrinkling and ultimate loads for sandwich panels with various edge conditions. A comparison is made between existing and newly derived expressions.

Behavior of light weight sandwich panels under out of plane bending loading

2016 ◽  
Vol 21 (4) ◽  
pp. 775-789
Author(s):  
S. Chitra Ganapathi ◽  
J. Annie Peter ◽  
N. Lakshmanan ◽  
N.R. Iyer
Keyword(s):  
Sandwich Panels ◽  
Light Weight ◽  
Out Of Plane ◽  
Plane Bending ◽  
Bending Loading

BUCKLING OF A PLATE ON A PASTERNAK FOUNDATION UNDER UNIFORM IN-PLANE BENDING LOADS

2013 ◽  
Vol 13 (03) ◽  
pp. 1250070 ◽  
Author(s):  
CASEY R. BRISCOE ◽  
SUSAN C. MANTELL ◽  
JANE H. DAVIDSON
Keyword(s):  
Local Buckling ◽  
Sandwich Panels ◽  
Core Material ◽  
Load Parameter ◽  
Buckling Strength ◽  
Thin Walled Structures ◽  
Special Cases ◽  
Order Of Magnitude ◽  
Bending Loads ◽  
Plane Bending

In-plane bending loads occur in many thin-walled structures, including web core sandwich panels (foam-filled panels with interior webs) under transverse loading. The design of such structures is limited in part by local buckling of the thin webs and the subsequent impact on stiffness and strength. However, the core material can have a significant impact on web buckling strength and thus must be considered in design. This paper presents solutions for the buckling strength of simply supported plates under in-plane bending loads. The location of the neutral bending axis is allowed to vary and is characterized by a load parameter. A Pasternak model is used to account for the resistance of the foundation to compression and shear. Using the principle of minimum potential energy, buckling solutions are developed for infinitely long plates and representative foundation materials. The solutions match known results for two special cases: Uniform loading with variable foundation, and bending loads with no foundation. An order of magnitude increase in buckling strength is possible, depending on loading and foundation stiffness. The results suggest an important avenue for future development of lightweight structures, including sandwich panels and structures such as plate girders that are not typically associated with the use of foam filling.

A STUDY ON BUCKLING STRENGTH OF TIMBER MATERIALS (PART 1): EVALUATION OF ELASTIC BUCKLING STRENGTH

2020 ◽  
Vol 85 (777) ◽  
pp. 1457-1467
Author(s):  
Wataru KAMBE ◽  
Hirofumi IDO ◽  
Yasunobu NODA ◽  
Kento SUZUKI
Keyword(s):  
Elastic Buckling ◽  
Buckling Strength

Comparison of Failure Modes of Piping Systems With Wall Thinning Subjected to In-Plane, Out-of-Plane, and Mixed Mode Bending Under Seismic Load: An Experimental Approach

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Izumi Nakamura ◽  
Akihito Otani ◽  
Masaki Shiratori
Keyword(s):  
Dynamic Behavior ◽  
Failure Modes ◽  
Seismic Load ◽  
Piping System ◽  
Shake Table ◽  
Shake Table Tests ◽  
Wall Thinning ◽  
Piping Systems ◽  
Out Of Plane ◽  
Plane Bending

Pressurized piping systems used for an extended period may develop degradations such as wall thinning or cracks due to aging. It is important to estimate the effects of degradation on the dynamic behavior and to ascertain the failure modes and remaining strength of the piping systems with degradation through experiments and analyses to ensure the seismic safety of degraded piping systems under destructive seismic events. In order to investigate the influence of degradation on the dynamic behavior and failure modes of piping systems with local wall thinning, shake table tests using 3D piping system models were conducted. About 50% full circumferential wall thinning at elbows was considered in the test. Three types of models were used in the shake table tests. The difference of the models was the applied bending direction to the thinned-wall elbow. The bending direction considered in the tests was either of the in-plane bending, out-of-plane bending, or mixed bending of the in-plane and out-of-plane. These models were excited under the same input acceleration until failure occurred. Through these tests, the vibration characteristic and failure modes of the piping models with wall thinning under seismic load were obtained. The test results showed that the out-of-plane bending is not significant for a sound elbow, but should be considered for a thinned-wall elbow, because the life of the piping models with wall thinning subjected to out-of-plane bending may reduce significantly.

scholarly journals Locally Corroded Stiffener Effect on Shear Buckling Behaviors of Web Panel in the Plate Girder

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Jungwon Huh ◽  
In-Tae Kim ◽  
Jin-Hee Ahn
Keyword(s):  
Corrosion Damage ◽  
Element Analysis ◽  
Buckling Strength ◽  
Lower Shear ◽  
Out Of Plane ◽  
Shear Buckling ◽  
Buckling Failure ◽  
Plane Displacement ◽  
The Web ◽  
Plate Girder

The shear buckling failure and strength of a web panel stiffened by stiffeners with corrosion damage were examined according to the degree of corrosion of the stiffeners, using the finite element analysis method. For this purpose, a plate girder with a four-panel web girder stiffened by vertical and longitudinal stiffeners was selected, and its deformable behaviors and the principal stress distribution of the web panel at the shear buckling strength of the web were compared after their post-shear buckling behaviors, as well as their out-of-plane displacement, to evaluate the effect of the stiffener in the web panel on the shear buckling failure. Their critical shear buckling load and shear buckling strength were also examined. The FE analyses showed that their typical shear buckling failures were affected by the structural relationship between the web panel and each stiffener in the plate girder, to resist shear buckling of the web panel. Their critical shear buckling loads decreased from 82% to 59%, and their shear buckling strength decreased from 88% to 76%, due to the effect of corrosion of the stiffeners on their shear buckling behavior. Thus, especially in cases with over 40% corrosion damage of the vertical stiffener, they can have lower shear buckling strength than their design level.

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