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.

Corrosion Pattern for Critical Shear Buckling Load of a Web Panel with Local Corrosion Damage

2013 ◽  
Vol 421 ◽  
pp. 778-783
Author(s):  
Shigenobu Kainuma ◽  
Jin Hee Ahn ◽  
In Tae Kim
Keyword(s):  
Corrosion Damage ◽  
Buckling Load ◽  
Local Corrosion ◽  
Buckling Loads ◽  
Buckling Strength ◽  
Shear Buckling ◽  
Girder Bridge ◽  
The Web ◽  
Plate Girder

Shear buckling strength of a web panel with local corrosion damage can be changed by web corrosion pattern. In this study, To find critical corrosion pattern for shear buckling of a web panel with local corrosion. Critical shear bucking loads of the corroded web panels were quantitatively evaluated. Thus, FE analsyis models were creasted cosidering corrosion pattern in the plate girder bridge which was reported from the corroded bridge inpection. As corrosion pattern of the web panel in the plate girder bridge, three corrosion patterns were selected as main corrosion cases such as longitudinal, vertical, and triangular cases. Their critical shear buckling loads were compared according to their corroded web codition.

scholarly journals Relationships between Imperfections and Shear Buckling Resistance in Web Plate with Sectional Damage Caused by Corrosion

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
Jin-Hee Ahn ◽  
Shigenobu Kainuma ◽  
Won-Hong Lee ◽  
Youn-Ju Jeong ◽  
In-Tae Kim
Keyword(s):  
Aspect Ratio ◽  
Plane Deformation ◽  
Corrosion Damage ◽  
Fe Analysis ◽  
Analysis Model ◽  
Buckling Resistance ◽  
Out Of Plane ◽  
Shear Buckling ◽  
Simple Evaluation ◽  
The Web

This study deals with the relationship between imperfections and shear buckling resistance of web plates with sectional damage caused by corrosion. To examine the imperfection effect on the shear buckling resistance of a web plate with sectional damage, a series of nonlinear finite element (FE) analyses were carried out for a web plate with sectional damage, which was assumed as local corrosion damage. For considering imperfections of the web plate in the girder, initial out-of-plane deformation was introduced in the FE analysis model. Using the FE analysis results, the changes in the shear buckling resistance of the web plate with sectional damage were quantitatively examined and summarized according to the aspect ratio, boundary conditions, and height of the damaged section of the web plate. The effects of web imperfections on the shear buckling resistance were evaluated to be little compared to that of the web plate without sectional damage. The shear buckling resistance was shown to significantly change in the high-aspect-ratio web plate. A simple evaluation equation for the shear buckling resistance of a web plate with sectional damage was modified for use in the practical maintenance of a web plate in corrosive environments.

Dynamic Buckling Response of Long Plates for the Prediction of Local Plate Buckling of Corrugated Core Sandwich Columns

2015 ◽  
Vol 82 (11) ◽  
Author(s):  
Jae-Yong Lim ◽  
Hilary Bart-Smith
Keyword(s):  
Model Development ◽  
Local Buckling ◽  
Longitudinal Direction ◽  
Plate Buckling ◽  
Proposed Model ◽  
Constant Rate ◽  
Out Of Plane ◽  
Alternative Methodology ◽  
Buckling Failure ◽  
Plane Displacement

An analytical model predicting the dynamic local buckling failure of plates with a large dimension in the longitudinal direction compressed at a constant rate was proposed. The model began with the hypothesis that the proposed analytical approach could be an alternative methodology to approximate the dynamic local plate buckling response of constituent plates of corrugated core sandwich columns. Prior to the model development, four preliminary finite-element (FE) simulations were conducted to observe the typical dynamic response of the sandwich columns having thin core web plates or thin face sheets. From the simulations, several wrinkles with a regular pattern were generated, and then one of the wrinkles grew excessively to a failure. Accordingly, the proposed model considered an imaginary patch plate on a long plate simulating a face sheet or a core web plate. The size of the patch plate was predefined so as to encompass the major growing wrinkle, and the out-of-plane displacement was calculated till load drop. The verification of the proposed model was followed by comparison with the FE calculations. The model was satisfactory in predicting maximum forces and times-to-failure, but some discrepancies were found when postcritical behavior and plasticity were involved. The sources of the discrepancies were discussed.

Simplified non-linear analysis of plates subjected to hydrocarbon explosions

2002 ◽  
Vol 37 (4) ◽  
pp. 301-312 ◽  
Author(s):  
L. A Louca ◽  
M. A Wadee
Keyword(s):  
Linear Analysis ◽  
Membrane Action ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Previous Formulation ◽  
Non Linear ◽  
Out Of Plane ◽  
Analysis Package ◽  
Linear Differential ◽  
Plane Displacement

An elastic Lagrangian formulation for an unstiffened plate subject to blast loading is presented. Building on a previous formulation, which accounted for membrane strains from purely out-of-plane displacement, the addition of in-plane stretching highlights the importance of membrane action. Numerical results of the resulting system of non-linear differential equations from the new model are compared with a non-linear finite element analysis package in terms of the various displacements and membrane strains, with good correlation.

scholarly journals Characterization of Shear Horizontal Waves Using a 1D Laser Doppler Vibrometer

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2467
Author(s):  
Alaa Elhady ◽  
Eihab M. Abdel-Rahman
Keyword(s):  
Acoustic Waves ◽  
Surface Deformation ◽  
Plane Surface ◽  
Poisson Ratio ◽  
Surface Acoustic Waves ◽  
Laser Doppler Vibrometer ◽  
Element Analysis ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Shear Horizontal

We developed a new technique for the detection of shear horizontal surface acoustic waves (SH-SAW) using a one-dimensional laser-based Doppler vibrometer. It measures the out-of-plane surface deformation at the fingertip of an interdigitated transducer (the boundary of the wave aperture) and uses it to estimate the instantaneous in-plane displacement field given the substrate Poisson ratio. It can also estimate the degree of surface confinement (wave decay rate). The proposed approach was first verified using finite element analysis (FEA) and demonstrated experimentally using a Bleustein–Gulyaev resonator.

Vibration Induced Fatigue Life Estimation of Corner Leads of Peripheral Leaded Components

1996 ◽  
Vol 118 (4) ◽  
pp. 244-249 ◽  
Author(s):  
Sidharth ◽  
D. B. Barker
Keyword(s):  
Fatigue Life ◽  
Integrated Circuits ◽  
Analytical Techniques ◽  
Electronic Packages ◽  
Element Analysis ◽  
Thermally Induced ◽  
Operating Environments ◽  
Fatigue Life Estimation ◽  
Out Of Plane ◽  
Plane Displacement

The rapid advancement of integrated circuits and associated electronic technologies have placed increasing demands on electronic packaging and its material structures in terms of the reliability requirements. In addition to the thermally induced stresses, electronic packages often experience dynamic external loads during shipping, handling, and/or operation. This is especially important for automotive, military, and commercial avionics operating environments. These dynamic loads give rise to large dynamic stresses in the leads causing fatigue failures. For peripheral leaded packages the corner leads are the most highly stressed leads. This paper addresses the determination of the out-of-plane displacement of the corner leads of peripheral leaded components when the local peripheral leaded component/board assembly is subjected to bending moments in two directions. The solution is achieved by using a combination of Finite Element Analysis (FEA), Design of Experiments (DOE), and analytical techniques. The out-of-plane displacement can then be applied as a boundary condition on a local lead model to determine the stresses which in turn can be used to estimate the fatigue life.

Design Optimization of a Novel, Large-Displacement, Multi-Axis, Silicon/Polymer Hybrid Actuator for Micro Optics

2003 ◽  
Author(s):  
Yi-Chung Tung ◽  
Jeong-Gil Kim ◽  
Katsuo Kurabayashi
Keyword(s):  
Design Optimization ◽  
Parametric Design ◽  
Actuation Voltage ◽  
Three Dimensional ◽  
Element Analysis ◽  
Optical Scanners ◽  
Polymer Hybrid ◽  
Out Of Plane ◽  
Micro Optics ◽  
Plane Displacement

This paper investigates a novel silicon/polymer hybrid MEMS actuator and reports on its design optimization. The actuator, incorporating a three-dimensional poly(dimethylsiloxane) (PDMS) flexural microstructure, is designed to generate multi-axis displacement of motion. This work develops a four-bar linkage model for parametric design of the actuator and validates it using finite element analysis (FEA). The optimization of the device geometry is performed using Genetic Algorithm (GA) such that the resulting out-of-plane displacement can achieve a maximum value under several design constrains due to fabrication and operation limitations. The out-of-plane displacement of the optimized actuator structure is calculated to be as large as 60 μm at 50 V input actuation voltage. Due to its unique mechanical and optical material properties, the PDMS microstructure allows the proposed device to achieve actuation performances suitable for a wide variety of micro-optics applications, including micro optical scanners, dynamic-focus micro lens holders, and mechanically flexible optical gratings.

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