scholarly journals Study of Structural Stability for H-section Beams Made of Fire Resistant Steels (FR 490) at High Temperatures by Analytical Method

2014 ◽  
Vol 28 (5) ◽  
pp. 52-57 ◽  
Author(s):  
In-Kyu Kwon
Keyword(s):  
Structural Stability ◽  
High Temperatures ◽  
Analytical Method

Recrystallisation Resistance of Extruded and Cold Rolled Aluminium Alloys with Additions of Hf, Sc and Zr

2006 ◽  
Vol 519-521 ◽  
pp. 525-530 ◽  
Author(s):  
Håkon Hallem ◽  
W.J. Rittel ◽  
Børge Forbord ◽  
Knut Marthinsen
Keyword(s):  
Cold Rolling ◽  
Structural Stability ◽  
High Temperatures ◽  
High Resistance ◽  
Aluminium Alloys ◽  
Cold Rolled

A high recrystallisation resistance is required in aluminium alloys intended for processing or use at temperatures between 450°C-600°C. Additions of Hf, Sc and Zr significantly improve the resistance to recrystallisation through the formation of Al3X-dispersoids (X=Hf,Sc,Zr), and in this work different concentrations and combinations of these elements were added to five aluminium alloys. The alloys were extruded, subjected to various degrees of cold rolling (0%-80%) and finally annealed at high temperatures in order to study the structural stability. All variants displayed a high resistance towards recrystallisation, but the best results were obtained in the alloy containing only Sc and Zr. In this alloy no signs of recrystallisation were observed even after 1 hour annealing of extruded and 80% cold rolled profiles at 600°C.

Structural stability of a golden semiconducting orthorhombic polymorph of Ti2O3under high pressures and high temperatures

2010 ◽  
Vol 22 (37) ◽  
pp. 375402 ◽  
Author(s):  
Sergey V Ovsyannikov ◽  
Xiang Wu ◽  
Vladimir V Shchennikov ◽  
Alexander E Karkin ◽  
Natalia Dubrovinskaia ◽  
...  
Keyword(s):  
Structural Stability ◽  
High Temperatures ◽  
High Pressures

Structural stability of conducting oxide CaRuO3 at high temperatures

2007 ◽  
Vol 90 (25) ◽  
pp. 251913 ◽  
Author(s):  
Rajeev Ranjan ◽  
Anatoliy Senyshyn ◽  
Vladimir Vashook ◽  
Rainer Niewa ◽  
Hans Boysen ◽  
...  
Keyword(s):  
Structural Stability ◽  
High Temperatures

Creep Modeling in Bolted Flange Joints

2004 ◽  
Author(s):  
Abdel-Hakim Bouzid ◽  
Akli Nechache
Keyword(s):  
High Temperatures ◽  
Contact Stress ◽  
Analytical Method ◽  
Calculation Procedure ◽  
Design Calculation ◽  
Bolted Joint ◽  
Load Relaxation ◽  
Gasket Material ◽  
Bolted Flange

Bolted flanged connections are used extensively in the petrochemical and nuclear industries. Under high temperatures, their leakage tightness behavior is compromised due to the loss of load as a result of creep of not only the gasket material but also the bolt and the flange materials. The relaxation of the bolt load and the corresponding loss of the gasket contact stress are not easy to assess analytically and consequently there is no established design calculation procedure. The objective of this paper is to present an analytical method that is part of the SuperFlange program [1] and is capable of predicting the load relaxation in a bolted joint when subjected to flange, bolt and gasket creep. The proposed method is validated by comparison with 3D FE models of different size flanges. In some cases, the relaxation caused by the flange and bolt materials is shown to be significant.

An analytical method for DC negative corona discharge in a wire-cylinder device at high temperatures

2014 ◽  
Vol 72 (4) ◽  
pp. 270-284 ◽  
Author(s):  
Xihui Wang ◽  
Mingjiang Ni ◽  
Gang Xiao ◽  
Jiapeng Zhang ◽  
Xiang Gao ◽  
...  
Keyword(s):  
Corona Discharge ◽  
High Temperatures ◽  
Analytical Method ◽  
Negative Corona ◽  
Negative Corona Discharge

Evaluation Study on Mechanical Properties of Submarine Structural Steel at High Temperatures

2013 ◽  
Vol 815 ◽  
pp. 212-215
Author(s):  
In Kyu Kwon ◽  
Hyung Jun Kim ◽  
Heung Youl Kim ◽  
Bum Yean Cho ◽  
Kyung Suk Cho
Keyword(s):  
Mechanical Properties ◽  
Structural Steel ◽  
Structural Stability ◽  
High Temperatures ◽  
Evaluation Study ◽  
Fire Load ◽  
Framed Structures ◽  
In Fire ◽  
Fire Load Density ◽  
Fire Outbreak

Steel framed structures have been increasingly built in Korea since the early 1970s and the use of submarine structural steel is being increased thanks to the easiness in welding and superior seismic performance. But, the risk of fire outbreak goes up because of the increase in fire load density. The evaluation of the structural stability of the structural frames at high temperatures can be done based on the mechanical properties of the applied steel at the high temperatures. In this paper, in order to get the fundamental data as to the structural stability of the steel frames built with submarine structural steel at high temperatures, coupon tests for SM 400, SM 490 and SM 520 at high temperatures were conducted and the results were compared with each other and with those of the euro-code for verification.

Influence of Hydrogen on the Structural Stability of Annealed Ultrathin Si/Ge Amorphous Layers

2009 ◽  
Vol 156-158 ◽  
pp. 325-330
Author(s):  
Cesare Frigeri ◽  
L. Nasi ◽  
M. Serényi ◽  
A. Csik ◽  
Z. Erdélyi ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Structural Stability ◽  
High Temperatures ◽  
Thermal Energy ◽  
Blow Up ◽  
Energy Dispersive ◽  
Electron Hole ◽  
Hydrogen Bubbles ◽  
Energy Dispersive Microanalysis ◽  
High Internal Pressure

The influence of hydrogen on the structural stability of multilayers made of ultrathin (3 nm) Si and Ge amorphous layers submitted to annealing to activate Si and Ge intermixing has been studied by TEM and AFM. By energy dispersive microanalysis the interdiffusion of Si and Ge has been observed. The Si/Ge multilayers, however, underwent remarkable structural degradation because of the formation of hydrogen bubbles which give rise to surface bumps and eventually craters when the bubbles blow up because of too high internal pressure in samples with high H content and annealed at high temperatures. The hydrogen forming the bubbles comes from the rupture of the Si-H and Ge-H bonds activated by the thermal energy of the annealing and by the energy released by the recombination of thermally generated electron hole pairs.

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