EFFECT OF GEOMETRICAL IMPERFECTION ON ANALYTICAL BUCKLING STRENGTH OF COLD-FORMED LIPPED CHANNEL STEEL MEMBER UNDER COMPRESSION

AbstractModern technologies and methods such as computer simulation, so-called in silico methods, foster the development of medical devices. For accelerating the uptake of computer simulations and to increase credibility and reliability the U.S. Food and Drug Administration organized an inter-laboratory round robin study of a generic nozzle geometry. In preparation of own bench testing experiment using Particle Image Velocimetry, a custom made silicone nozzle was manufactured. By using in silico computational fluid dynamics method the influence of in vitro imperfections, such as inflow variations and geometrical deviations, on the flow field were evaluated. Based on literature the throat Reynolds number was varied Rethroat = 500 ± 50. It could be shown that the flow field errors resulted from variations of inlet conditions can be largely eliminated by normalizing if the Reynolds number is known. Furthermore, a symmetric imperfection of the silicone model within manufacturing tolerance does not affect the flow as much as an asymmetric failure such as an unintended curvature of the nozzle. In brief, we can conclude that geometrical imperfection of the reference experiment should be considered accordingly to in silico modelling. The question arises, if an asymmetric benchmark for biofluid analysis needs to be established. An eccentric nozzle benchmark could be a suitable case and will be further investigated.

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Buckling strength prediction of CFRP cylindrical panels using finite element method

Composites Part A Applied Science and Manufacturing ◽

10.1016/s1359-835x(99)00015-9 ◽

1999 ◽

Vol 30 (9) ◽

pp. 1093-1104 ◽

Cited By ~ 8

Author(s):

K Kim ◽

G.Z Voyiadjis

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Strength Prediction ◽

Buckling Strength ◽

Cylindrical Panels ◽

Element Method

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Optimal design of tapered beams for maximum buckling strength

Engineering Structures ◽

10.1016/0141-0296(86)90035-0 ◽

1986 ◽

Vol 8 (4) ◽

pp. 276-284 ◽

Cited By ~ 9

Author(s):

C.M. Wang ◽

V. Thevendran ◽

K.L. Teo ◽

S. Kitipornchai

Keyword(s):

Optimal Design ◽

Buckling Strength

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

Advances in Materials Science and Engineering ◽

10.1155/2015/586264 ◽

2015 ◽

Vol 2015 ◽

pp. 1-19 ◽

Cited By ~ 1

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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