Probabilistic distributions of plate buckling strength for normal and bridge high-performance steels

2013 ◽  
Vol 13 (3) ◽  
pp. 557-567 ◽  
Author(s):  
Dang Viet Duc ◽  
Yoshiaki Okui ◽  
Koichi Hagiwara ◽  
Masatsugu Nagai
Keyword(s):  
High Performance ◽  
Buckling Strength ◽  
Plate Buckling

Local Buckling Strength and its Statistical Information of Normal and Bridge High Performance Steel Plates

2012 ◽  
Vol 18 (9) ◽  
pp. 1429-1435
Author(s):  
Viet Duc Dang ◽  
Yoshiaki Okui ◽  
Koichi Hagiwara ◽  
Masatsugu Nagai
Keyword(s):  
High Performance ◽  
Local Buckling ◽  
Statistical Information ◽  
Steel Plates ◽  
Buckling Strength ◽  
High Performance Steel

Probabilistic local buckling strength analysis of compressive plates for normal and bridge high performance steels

2014 ◽  
Vol 102 (22) ◽  
pp. 1157-1163
Author(s):  
Yoshiaki Okui ◽  
Masato Komuro ◽  
Dang Viet Duc
Keyword(s):  
High Performance ◽  
Local Buckling ◽  
Strength Analysis ◽  
Buckling Strength

Probabilistic ultimate buckling strength of stiffened plates, considering thick and high-performance steel

2017 ◽  
Vol 138 ◽  
pp. 184-195 ◽  
Author(s):  
Mahmudur Rahman ◽  
Yoshiaki Okui ◽  
Takahiro Shoji ◽  
Masato Komuro
Keyword(s):  
High Performance ◽  
Stiffened Plates ◽  
Buckling Strength ◽  
High Performance Steel

Elastic coupled buckling analysis in stiffened plates with T-bar stiffeners

2012 ◽  
Vol 227 (6) ◽  
pp. 1135-1149 ◽  
Author(s):  
Rahbar-Ranji Ahmad
Keyword(s):  
Buckling Analysis ◽  
Stiffened Plates ◽  
Elastic Buckling ◽  
Design Codes ◽  
Stiffened Plate ◽  
The Finite Element Method ◽  
Torsional Buckling ◽  
Buckling Modes ◽  
Buckling Strength ◽  
Plate Buckling

Stiffened plate buckles in different modes, including web/flange buckling, torsional buckling, plate buckling, and interactions of them. Generally, interactions of different buckling modes in stiffened plates are ignored and elastic buckling analysis of each mode is treated separately. In some design codes, to cope with interactions of different buckling modes, the influence of adjacent elements are considered as rotational springs. The main aim of this study is to compare literature- and rule-based expressions to assess the elastic buckling strength of T-bar stiffened plates and to identify the applicability of selected expressions for certain conditions. Different buckling modes and their interactions are investigated, and critical Euler stresses are evaluated. Upon comparison with given expressions and the finite element method, it is found that some of the proposed expressions are not applicable in certain conditions.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

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