Buckling Analysis of a Heated Steel Strip in a Continuous Annealing Furnace

1999 ◽  
Vol 121 (1) ◽  
pp. 76-83 ◽  
Author(s):  
H. Luo ◽  
W. S. Dunbar ◽  
J. E. Moore
Keyword(s):  
Heating Temperature ◽  
Steel Strip ◽  
Line Tension ◽  
Heating System ◽  
Continuous Annealing ◽  
Element Analysis ◽  
Steel Strips ◽  
Thin Steel ◽  
Actual Operation ◽  
Made In

Thermal buckling is a problem that arises in the operation of continuous annealing lines for thin steel strips. In this paper finite element analysis (FEA) is carried out on the furnace buckling of thin steel strips. The results obtained agree very well with observations of furnace buckling made in actual operation. It has been quantitatively shown that the main cause of furnace buckling is the combined effect of high heating temperature coupled with line tension on a strip. This finding is based on the comparison of numerical results with the experimental data collected at a continuous annealing line of Armco Ashland Works in Texas. The analysis has revealed the need for accurate control and monitoring of annealing line heating system in order to avoid buckling of thin steel strips. In addition, the results presented, herein, could be useful in the design of a heating system that ensures buckling free operation.

scholarly journals Optimization of the process of steel strip perforation and nickel platting for the purpose of elimination of trichloroethylene from the cleaning process of perforated steel strip

2009 ◽  
Vol 63 (1) ◽  
pp. 57-60
Author(s):  
Aleksandra Petrovic ◽  
Slavica Glisic
Keyword(s):  
Organic Solvent ◽  
Steel Strip ◽  
Cleaning Process ◽  
Used Oil ◽  
Additional Heating ◽  
Steel Strips ◽  
The Many ◽  
Made In

In the production of pocket type electrodes for Ni-Cd batteries perforation of proper steel strips and then nickel platting of perforated steel strips were made. In the nickel platting process, the organic solvent, trichloroethylene, has previously been used for cleaning. Due to the carcinogenic nature of trichloroethylene and the many operations previously required during cleaning, it was considered to do cleaning of perforated steel strips without use of the mentioned organic solvent. In the purpose of elimination of trichloroethylene from the cleaning process of perforated steel strips, the tests of perforation of steel strips with use of oils of different viscosity were made. It was shown that there was no dysfunction during the work of the perforation plants, meaning there was no additional heating of the strips, deterring of the steel filings, nor excessive wearing of the perforation apparatus. The perforation percent was the same irrelevant of the viscosity of the used oil. Before being perforated using the oils with different viscosity, the nickel platting steel strips were cleaned in different degreasers (based on NaOH as well as on KOH). It was shown that efficient cleaning without the use of trichloroethylene is possible with the use of oil with smaller viscosity in the perforated steel strips process and the degreaser based on KOH in the cleaning process, before nickel platting. It also appeared that the alkali degreaser based on KOH was more efficient, bath corrections were made less often and the working period of the baths was longer, which all in summary means less quantity of chemicals needed for degreasing of perforated steel strips.

Design for Desired Mode Shapes: Preliminary Results

1998 ◽  
Author(s):  
Elizabeth K. Lai ◽  
G. K. Ananthasuresh
Keyword(s):  
Finite Element ◽  
Feasibility Study ◽  
Mode Shape ◽  
Longitudinal Axis ◽  
Mode Shapes ◽  
Future Research ◽  
Structural Members ◽  
Element Analysis ◽  
Cross Sectional ◽  
Made In

Abstract This paper is concerned with the shape optimization of structures to attain prescribed normal mode shapes. Optimizing structural members in order to have desired mode shapes, besides the desired natural frequencies, is of interest in some applications at both macro and micro scales. After reviewing the relevant past work on the “inverse mode shape” problem, a feasibility study using the lumped spring-mass models and finite element models of an axially vibrating bar is presented. Based on the observations made in the feasibility study with bars, a meaningful optimization problem is formulated and solved. Using finite element analysis and numerical optimization, a method for designing beam-like structures for prescribed mode shapes is developed. The method is demonstrated with an example of designing the cross-sectional area profile of a beam along its longitudinal axis to get a desired fundamental mode shape. The nonuniqueness of the solution is noted and avenues for future research are identified.

Finite Element Analysis of Tool Wear in Hot Machining Process

2019 ◽  
pp. 232-248
Author(s):  
Asit Kumar Parida
Keyword(s):  
Tool Wear ◽  
Room Temperature ◽  
Heating Temperature ◽  
Chip Morphology ◽  
High Hardness ◽  
Tool Temperature ◽  
Element Analysis ◽  
Hot Machining ◽  
Wear And Corrosion Resistance ◽  
Wear Tool

Super alloys have been used widely in all sectors (e.g., automobile, aerospace, biomedical, etc.) for their properties like high hardness, high wear, and corrosion resistance. A central challenge is the significantly higher temperature and pressure on the cutting tool, hence rapid tool wear and bad surface finish. In the present study, a FEM analysis has been developed to calculate the effect of preheating temperature on the surface of the workpiece on tool wear on machining Inconel 718. Usui's tool wear model has been implemented in DEFORM software. In order to validate the results, an experimental investigation has been carried out with same cutting conditions. The evaluated results were also compared with the room temperature machining condition. It was observed that the heating temperature increased the tool life by reducing tool wear, tool temperature compared to room temperature machining condition. The predicted tool wear, tool temperature, and chip morphology have been compared with the experimental results and good correlation was found.

An Analysis of the Bonding Energy through Pull-Out Tests for Aerated Concrete with Various Steel Strip Geometries

2011 ◽  
Vol 275 ◽  
pp. 55-58 ◽  
Author(s):  
Dariusz Alterman ◽  
Juan Vilches ◽  
Thomas Rainer Neitzert
Keyword(s):  
Surface Area ◽  
Steel Strip ◽  
Bonding Energy ◽  
Ball Joint ◽  
Pull Out ◽  
Steel Strips ◽  
Aerated Concrete ◽  
Set Up ◽  
The Relationship

The relationship between various steel strip geometries and the bonding energy through pull-out tests of aerated concrete specimens is investigated. Prismatic concrete samples containing embedded steel strips with and without holes of differing sizes and quantities were analysed. Improvements of the bonding energy through pull-out tests by 70% are possible by increasing the number of holes on a steel strip from one to four while maintaining a constant surface area. The energy increased even up to 130% for strips containing holes compared to strips without. In addition, the tests have been carried out with a novel easy to assemble set-up containing a freely adjustable ball-joint and a plate with embedded bolts to avoid eccentricity during pull-out tests.

Analysis of ZDDP Films on Sticking Defects by FEM during Hot Rolling of Ferritic Stainless Steel Strips

2016 ◽  
Vol 846 ◽  
pp. 96-101
Author(s):  
Liang Hao ◽  
Zheng Yi Jiang ◽  
Dian Yao Gong ◽  
Dong Bin Wei ◽  
Xia Wei Cheng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Hot Rolling ◽  
Steel Strip ◽  
Crack Size ◽  
Surface Characterisation ◽  
Fem Model ◽  
Steel Strips ◽  
Simulation Results

The aim of this study is to understand the effect of zinc dialkyl dithio phosphate (ZDDP) films on sticking defects during the hot rolling of ferritic stainless steel strips. The surface characterisation and crack propagation are very important for the sticking defects of ferritic stainless steel strip. A finite element method (FEM) model is constructed with different crack size ratios, in which the profile of the strip roughness and ZDDP films are taken into consideration. Simulation results show that the widths of cracks tend to be reduced with the introduction of ZDDP films, improving the sticking defects, which is confirmed by the hot rolling trials.

Nonlinear Finite Element Analysis of Masonry Wall Strengthened with Steel Strips

2013 ◽  
Vol 838-841 ◽  
pp. 284-296
Author(s):  
Yu Hua Wang ◽  
Bei Bei Wang ◽  
Pei Chi ◽  
Jun Dong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Lateral Displacement ◽  
Unreinforced Masonry ◽  
Masonry Wall ◽  
Shear Capacity ◽  
Computational Formula ◽  
Element Analysis ◽  
Steel Strips ◽  
The Cross

The finite element analysis method was adopted to simulate the masonry wall strengthened with steel strips and was verified by comparing with test results. The influence rules of two factors including the cross sectional area of steel strips and vertical compression were investigated. The results show that, as for unreinforced masonry wall, the relationship of the shear capacity of unreinforced masonry wall and the vertical compressive strain is linear under lateral load; the speed of stiffness degeneration is accelerated after the peak point of the curves, but decrease with the increasing of lateral displacement. As for masonry wall strengthened with steel strips, the shear capacity increases significantly, and shows nonlinear relationship with the cross section area of the steel strips and vertical compression; ductility is improved. Finally, a computational formula of shear capacity based on a lot of parametric analysis is proposed to calculate the sectional dimension of steel strips, and it provides theoretical foundation for establishing thorough design method of masonry wall strengthened with steel strips.

scholarly journals Control of Spatial Deposition of Electrospun Fiber Using Electric Field Manipulation

2014 ◽  
Vol 9 (1) ◽  
pp. 155892501400900 ◽  
Author(s):  
Abdul Hamid Nurfaizey ◽  
Jonathan Stanger ◽  
Nick Tucker ◽  
Neil Buunk ◽  
Alan R. Wood ◽  
...  
Keyword(s):  
Electric Field ◽  
Electrospun Fiber ◽  
Electrospun Fibers ◽  
Element Analysis ◽  
Significant Challenge ◽  
Deposition Area ◽  
Controlled Deposition ◽  
Uniform Deposition ◽  
Field Manipulation ◽  
Made In

A significant challenge in the synthesis of uniform membranes via electrospinning is achieving a spatially uniform deposition of electrospun fibers. The problem is more pronounced in the case of a multi-spinneret system due to self repulsion between the jets. In this study, electric field manipulation ( via auxiliary electrodes) is explored as a potential technique for controlling the spatial deposition area of electrospun fiber. It was observed experimentally that the location and size of the deposition area can be moved linearly in response to the applied voltages at the auxiliary electrodes. Finite element analysis (FEA) was used to simulate the electric field strength and distribution at a given applied voltage and its effect on the flight path of electrospun fiber. Comparisons between experiments and simulations were made in evaluating the accuracy of simulations. The adaptation of this technique in production would provide a method of controlled deposition for producing uniform electrospun fiber membranes.

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