Endochronic simulation for the response of 1020 carbon steel tubes under symmetric and unsymmetric cyclic bending with or without external pressure

2008 ◽  
Vol 8 (2) ◽  
pp. 99-114 ◽  
Author(s):  
Kuo-Long Lee ◽  
Chien-Min Hsu ◽  
Chao-Yu Hung
Keyword(s):  
Carbon Steel ◽  
External Pressure ◽  
Steel Tubes ◽  
Cyclic Bending

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

Detection of localised flaws in small-diameter carbon steel tubes using multi-NDE techniques

2020 ◽  
Vol 62 (11) ◽  
pp. 649-655
Author(s):  
W Sharatchandra Singh ◽  
C K Mukhopadhyay
Keyword(s):  
Carbon Steel ◽  
Spatial Resolution ◽  
Small Diameter ◽  
Low Carbon Steel ◽  
Inspection System ◽  
Outer Diameter ◽  
Low Carbon ◽  
Steel Tubes ◽  
Different Types ◽  
Flux Leakage

This paper proposes multi-NDE techniques for enhanced and reliable detection of localised defects or flaws in small-diameter (19.05 mm outer diameter (OD) and 2.77 mm wall thickness (WT)) low-carbon steel tubes. Multi-NDE techniques comprising magnetic flux leakage (MFL), remote field eddy current (RFEC) and the ultrasonic internal rotary inspection system (IRIS) are used to investigate the detectability and spatial resolution for the detection of localised flaws of different types and sizes, which simulate flaws generally formed in carbon steel tubes. The studies reveal that the MFL and IRIS techniques detect 0.55 mm-deep holes and notches while the RFEC technique detects 1.11 mm-deep holes and 0.55 mm-deep notches. The IRIS technique is capable of resolving axial and circumferential holes (1 mm diameter and 1.39 mm depth) of 2 mm hole-to-hole separation, while the MFL technique can resolve axial holes of 2 mm hole-to-hole separation but not circumferential holes. The RFEC technique can detect axial holes as a single hole but is unable to detect circumferential holes, resulting in no spatial resolution for the axial and circumferential holes. Compared to the MFL and RFEC signals, IRIS readily discerns the spatial extent of the flaws with the possibility of sizing from the images. The study also reveals that the resolution capability of the IRIS technique is influenced by the speed of the turbine rotation inside the tube.

Improving the surface quality of semifinished carbon-steel tubes

Metallurgist ◽  
1978 ◽  
Vol 22 (6) ◽  
pp. 390-393
Author(s):  
A. V. Satin ◽  
R. M. Ivanov ◽  
M. L. Shul'kin ◽  
V. S. Lobachev ◽  
L. G. Shub ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Surface Quality ◽  
Steel Tubes

Failure of carbon steel tubes in a fluidized bed combustor

2008 ◽  
Vol 15 (1-2) ◽  
pp. 182-187 ◽  
Author(s):  
V. Kain ◽  
K. Chandra ◽  
B.P. Sharma
Keyword(s):  
Carbon Steel ◽  
Fluidized Bed ◽  
Steel Tubes ◽  
Fluidized Bed Combustor

Collapse of Imperfect Corroded Steel Tubes

2003 ◽  
Author(s):  
Anto´nio F. Mateus ◽  
Joel A. Witz
Keyword(s):  
Structural Mechanics ◽  
External Pressure ◽  
Thickness Reduction ◽  
Geometrical Configuration ◽  
Uniform Thickness ◽  
Steel Tubes

This paper presents the results of an investigation into the structural mechanics of corroded steel tubes and quantifies the discrepancies resulting from two approaches to modelling the effects of corrosion: uniform thickness reduction and quasi-random thickness. It is shown how the geometrical configuration of the tube’s corroded surface influences its strength under external pressure and how it may lead to collapse localisation phenomena.

scholarly journals Dynamic Axial Crushing of Empty and Foam-Filled Conical Aluminium Tubes: Experimental and Numerical Analysis

2014 ◽  
Vol 566 ◽  
pp. 305-309
Author(s):  
Fauziah Mat ◽  
K.A. Ismail ◽  
Masniezam Ahmad ◽  
Yaacob Sazali ◽  
Inayatullah Othman
Keyword(s):  
Carbon Steel ◽  
Steel Tube ◽  
Nonlinear Finite Element ◽  
Aluminium Foam ◽  
Fe Model ◽  
Steel Tubes ◽  
Foam Filling ◽  
Foam Filled ◽  
Initial Peak ◽  
Selection Of

This paper presents the crushing behaviour of empty and foam-filled conical tubes under axial dynamic loading. A nonlinear finite element (FE) model was developed and validated against experiments. The validated model was subsequently used to assess the beneficial of foam filling with regards to the variation in filler densities and tube materials. The results obtained were further analyzed and compared with straight tubes. We aim to evaluate the critical effective point for different density of fillers in foam-filled tubes based on specific energy absorption (SEA) value. The SEA value was highest for foam-filled conical aluminium tube with aluminium foam filler, followed by straight aluminium tube, straight carbon steel tube and conical carbon steel tube. Moreover, the initial peak force was found lower in aluminium tubes than carbon steel tubes and lower in conical tubes than that in straight tubes. The combination of conical aluminium tube and aluminium foam filler successfully convey the beneficial of foam filling and thus signify that proper combination and selection of tube and filler is vital in assessing the effectiveness of foam-filled tubes.

scholarly journals Stress Induced in Low Carbon Steel Tubes of Kids Bicycle Upon Impact

2019 ◽  
Vol 9 (2S4) ◽  
pp. 199-201
Keyword(s):  
Carbon Steel ◽  
Product Innovation ◽  
New Products ◽  
Low Carbon Steel ◽  
High Rate ◽  
Low Carbon ◽  
Steel Tubes ◽  
A Company ◽  
Continuous Product

The market environment is characterized by keen competition, an oversupply of goods, rapidly shifting tastes and a high rate of product innovation ad obsolescence. The long term profitability or the very survival of a company depends on new products and on commitments to continuous product innovation. Firms are seeking differential advantage and their actions continue to segment large market into smaller sub-segments. There is often a back and forth action between market reconsolidation based on innovation and fragmentation based on competition.

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