scholarly journals STATISTICAL INVESTIGATION OF I-SHAPED STIFFENED RECTANGULAR PLATE BY TAGUCHI RESPONSE EVALUATION

2021 ◽  
Author(s):  
Molwane O.B ◽  
◽  
Agarwal A ◽  
Letsatsi M.T ◽  
Keyword(s):  
Rectangular Plate ◽  
Safety Factor ◽  
Statistical Investigation ◽  
Response Evaluation ◽  
Buckling Loads ◽  
Buckling Resistance ◽  
Optimization Parameters ◽  
Sensitivity Rate ◽  
Fea Simulation ◽  
Width Measurements

In this research, the buckling of stiffened rectangular plate with square opening is studied using techniques of FEA. The stiffener used for analysis is I shaped placed on edges and in vertical configuration. Critical buckling loads are determined from load multiplier values obtained from FEA simulation. The features of stiffener are further optimized with Taguchi response technique to acquire essential responses of variables with respect to yield variables. The sensitivities of various optimization parameters are also determined. The results indicated that substantial enhancement in buckling resistance can be achieved through optimized dimensions of stiffeners. For safety-factor least both lower width and upper width shows positive sensitivities with lower width sensitivity rate is 54.041 (positive) and upper width rate is additionally 54.041 (positive). Hence, both upper width measurements and lower width has same impact on factor noticed for SPSW.

scholarly journals Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners

2020 ◽  
Vol 8 (7) ◽  
pp. 515 ◽  
Author(s):  
Artur Siqueira Nóbrega de Freitas ◽  
Alexander Alfonso Alvarez ◽  
Roberto Ramos ◽  
Ettore Apolonio de Barros
Keyword(s):  
Cylindrical Shell ◽  
Residual Stresses ◽  
Structural Design ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Manufacturing Cost ◽  
Buckling Loads ◽  
Buckling Resistance ◽  
High Hydrostatic Pressures ◽  
Innovative Concept

The structure of an autonomous underwater vehicle (AUV), usually composed of a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the buckling resistance, however, in small AUVs, they reduce the inner space and cause residual stresses. This work presents an innovative concept for the structural design of an AUV, proposing the use of sliding stiffeners that are part of the structure used to accommodate the electronics inside it. Since the sliding stiffeners are not welded to the shell, there are no residual stresses due to welding, the AUV fabrication process is simplified, enabling a reduction of the manufacturing cost, and the inner space is available to accommodate the equipment needed for the AUV mission. Moreover, they provide a higher buckling resistance when compared to that of an unstiffened cylindrical shell. A comparative analysis of the critical buckling loads for different shell designs was carried out considering the following: (i) the unstiffened shell, (ii) the shell with ring stiffeners, and (iii) the shell with sliding stiffeners. Results evidenced that major advantages were obtained by using the latter alternative against buckling.

Static Stability Behaviour of Plate Elements with Non-Uniform, in-Plane Stress Distribution

1979 ◽  
Vol 21 (5) ◽  
pp. 363-365
Author(s):  
P. K. Datta
Keyword(s):  
Stress Distribution ◽  
Boundary Conditions ◽  
Rectangular Plate ◽  
Plane Stress ◽  
Mixed Boundary ◽  
Mixed Boundary Conditions ◽  
Static Stability ◽  
Buckling Loads ◽  
Plate Elements ◽  
Edge Loading

The results of analytically and experimentally determined buckling loads of a rectangular plate, subjected to partial edge loading and mixed boundary conditions, are presented.

scholarly journals Analysis on free vibration and critical buckling load of a FGM porous rectangular plate

2021 ◽  
Vol 39 (2) ◽  
pp. 317-325
Author(s):  
Zhaochun Teng ◽  
Pengfei Xi
Keyword(s):  
Differential Equation ◽  
Elastic Modulus ◽  
Free Vibration ◽  
Boundary Conditions ◽  
Rectangular Plate ◽  
Natural Frequencies ◽  
Gradient Index ◽  
Rectangular Plates ◽  
Buckling Loads ◽  
Governing Differential Equation

The properties of functionally gradient materials (FGM) are closely related to porosity, which has effect on FGM's elastic modulus, Poisson's ratio, density, etc. Based on the classical theory of thin plates and Hamilton principle, the mathematical model of free vibration and buckling of FGM porous rectangular plates with compression on four sides is established. Then the dimensionless form of the governing differential equation is also obtained. The dimensionless governing differential equation and its boundary conditions are transformed by differential transformation method (DTM). After iterative convergence, the dimensionless natural frequencies and critical buckling loads of the FGM porous rectangular plate are obtained. The problem is reduced to the free vibration of FGM rectangular plate with zero porosity and compared with its exact solution. It is found that DTM gives high accuracy result. The validity of the method is verified in solving the free vibration and buckling problems of the porous FGM rectangular plates with compression on four sides. The results show that the elastic modulus of FGM porous rectangular plate decreases with the increase of gradient index and porosity. Furthermore, the effects of gradient index and porosity on dimensionless natural frequencies and critical buckling loads are further analyzed under different boundary conditions with constant aspect ratio, and the effects of aspect ratio and load on dimensionless natural frequencies under different boundary conditions.

Symmetrical Buckling of a Series of Uniformly Loaded Parallel Struts Supported by Spot Connections to a Long Thin Plate

1957 ◽  
Vol 24 (4) ◽  
pp. 531-536
Author(s):  
J. L. Cutcliffe ◽  
H. S. Heaps
Keyword(s):  
Critical Load ◽  
Rectangular Plate ◽  
Elastic Properties ◽  
Thin Plate ◽  
Buckling Loads

Abstract The deflection in buckling of a long panel consisting of parallel stiffeners across a rectangular plate is found when equal buckling loads are applied to the ends of each stiffener. The critical load for buckling is found as a function of the elastic properties of the plate and the stiffeners for various spacings of stiffeners, and the number of spot connections to the plate.

Anti-Buckling Design of Rectangular Thin Plate Based on Local Surface Nanocrystallization

2020 ◽  
Vol 975 ◽  
pp. 103-108
Author(s):  
Zeng Bo Lian ◽  
Zhen Zhao ◽  
Wang Xu ◽  
C.W. Lim ◽  
Xin Sheng Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulations ◽  
Rectangular Plate ◽  
Thin Plate ◽  
Rectangular Thin Plate ◽  
Local Surface ◽  
Buckling Loads ◽  
Critical Buckling Load ◽  
Surface Nanocrystallization ◽  
The Stability

In this paper, a novel local surface nanocrystallization treatment is introduced to design the anti-buckling rectangular plate. The mechanical properties and critical buckling loads of the plates are greatly improved by the surface nanocrystallization technology. Several local nanocrystallization layouts, including the horizonal stripes distribution, the vertical stripes distribution and the spaced latticed blocks distribution, are designed and numerical simulations are carried out to evaluate the stability of the plates. Results show that the critical buckling load was significantly improved by the local nanocrystallization treatment. Among all the designs, the critical buckling loads for the vertical nanocrystallization layouts is the optimal one. And the technology can also be extended to the anti-buckling design of other structures.

Buckling of Flat Plates Under Bending and Shear

1998 ◽  
Vol 212 (4) ◽  
pp. 249-261 ◽  
Author(s):  
C A Featherston ◽  
C Ruiz
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rectangular Plate ◽  
Constant Stress ◽  
Theoretical Solution ◽  
Flat Plates ◽  
Element Analysis ◽  
Design Rules ◽  
Buckling Loads ◽  
Stress Levels

Extensive work has been carried out to determine expressions for the critical buckling loads of flat plates under the elementary load cases of shear, compression and bending, and combinations of these three. Existing solutions are based on constant stress levels throughout the plate, but no theoretical solution or design rules exist for more complex situations. Finite element analysis is often therefore used to solve more complicated cases. This paper outlines a programme of work that has been undertaken to compare collapse loads predicted by theoretical, experimental and finite element analysis predicted collapse loads for the case of a flat rectangular plate under combined shear and bending.

Low - Voltage Scanning Electron Microscopy Imaging, Secondary and Backscatter, With Microchannel Plate Detector

1990 ◽  
Vol 48 (1) ◽  
pp. 442-442
Author(s):  
Galen Powers ◽  
Ray Cochran
Keyword(s):  
Low Voltage ◽  
Beam Current ◽  
Microchannel Plate ◽  
Normal Operation ◽  
Microscopy Imaging ◽  
Backscatter Signal ◽  
Vacuum Interface ◽  
Width Measurements ◽  
Working Distance ◽  
Beam Currents

The capability to obtain symmetrical images at voltages as low as 200 eV and beam currents less than 9 pico amps is believed to be advantageous for metrology and study of dielectric or biological samples. Symmetrical images should allow more precise and accurate line width measurements than currently achievable by traditional secondary electron detectors. The low voltage and current capability should allow imaging of samples which traditionally have been difficult because of charging or electron beam damage.The detector system consists of a lens mounted dual anode MicroChannel Plate (MCP) detector, vacuum interface, power supplies, and signal conditioning to interface directly to the video card of the SEM. The detector has been miniaturized so that it does not interfere with normal operation of the SEM sample handling and alternate detector operation. Biasing of the detector collection face will either add secondaries to the backscatter signal or reject secondaries yielding only a backscatter image. The dual anode design allows A−B signal processing to provide topological information as well as symmetrical A+B images.Photomicrographs will show some of the system capabilities. Resolution will be documented with gold on carbon. Variation of voltage, beam current, and working distance on dielectric samples such as glass and photoresist will demonstrate effects of common parameter changes.

Scattering from a Thin Rectangular Plate at Glancing Incidence

2001 ◽  
Vol 21 (2) ◽  
pp. 147-163 ◽  
Author(s):  
Hirohide Serizawa ◽  
Kohei Hongo ◽  
Hirokazu Kobayashi
Keyword(s):  
Rectangular Plate ◽  
Thin Rectangular Plate

Wavenumber restriction in the buckling instability of a rectangular plate

1985 ◽  
Vol 46 (3) ◽  
pp. 343-347 ◽  
Author(s):  
W. Zimmermann ◽  
L. Kramer
Keyword(s):  
Rectangular Plate ◽  
Buckling Instability
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