Approximate analysis of structures in the presence of moderately large creep deformations

Hoff, N. J.

doi:10.1090/qam/61004

Cited by 209 publications

(77 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Norton-Hoff visco-plastic formulation is defined from the visco-plastic potential convenient to derive the variation and the weak forms equivalent to the equilibrium equations. The Norton-Hoff state of visco-plastic materials is expressed by the equation [18][19][20][21][22]: …”

Section: Methodology Of Science Researchmentioning

confidence: 99%

The Numerical and Experimental Analysis of Ballizing Process of Steel Tubes

Dyl

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

This paper presents chosen results of experimental and numerical research of ballizing process of the steel tubes. Ballizing process is a method of burnishing technology of an internal diameter by precisely forcing a ball through a slightly undersized premachined tubes. Ballizing process is a fast, low-cost process for sizing and finishing tubes. It consists of pressing a slightly oversized ball through an unfinished tube to quickly bring the hole to desired size. The ball is typically made from a very hard material such as tungsten carbide or bearing steel. Ballizing process is by cold surface plastic forming of the surface structure, thereby leaving a layer of harder material and reducing its roughness. After theoretical and experimental analysis it was determined that the smaller the diameter of the balls, the bigger intensity of stress and strain and strain rate. The paper presents influence of ballizing process on the strain and stress state and on the surface roughness reduction rate of the steel tubes.

show abstract

Section: Methodology Of Science Researchmentioning

confidence: 99%

The Numerical and Experimental Analysis of Ballizing Process of Steel Tubes

Dyl

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…The rheological properties of the model AlMgSi material were taken from the database of the Forge ® 3D 2011 numerical program [4]. For solving the problems of three-dimensional plastic metal flow during extrusion, a mathematical model [7] was selected, in which the mechanical state of the material being deformed was described using the Norton-Hoff law [13,14], which can be expressed with the equation below:…”

Section: The Core Of the Process And The Modelling Assumptionsmentioning

confidence: 99%

The Development and Numerical Analysis of the Conical Radiator Extrusion Process

Michalczyk

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The article presents a newly developed method for single-operation extrusion of conical radiators. This is the author's radiator manufacturing method being the subject of a patent application. The proposed method enables the manufacture of radiators either with or without an inner opening and with an integral plate. Selected results of numerical computations made within Forge®3D, a finite element method (FEM)-based software program, were presented during the analysis of the process. A comparative analysis of the proposed manufacturing method using the double-sided extrusion method was also made.The proposed manufacturing method is assumed to produce radiators in a single technological operation with the stock material being standardized 30 mm-diameter aluminium bars. The objective of the developed method is also to reduce the energy-force parameters.

show abstract

“…The frictional stress at the tube and platen interfaces is assumed to obey the Norton-Hoff frictional law [12]. Accordingly the frictional stress ( f ) is assumed to be governed by the following relation …”

Section: Finite Element Simulationmentioning

confidence: 99%

Investigation of External Inversion of Thin-Walled Tubes

Gupta¹,

Gupta²

2013

Proceedings of the Indian National Science Academy

View full text Add to dashboard Cite

In this paper a computational study of development of external inversion of round metallic aluminium tubes over a fixed profile die is presented. Inversion mode of deformation is analyzed in detail by using a finite element code FORGE2. The proposed finite element model for this purpose idealizes the deformation as axisymmetric. Six nodded triangular elements are used to descretize the domain. The material is modelled as rigid-viscoplastic. Typical variations of equivalent strain rate and equivalent strain and energy dissipation mechanisms during inversion are presented. Results presented are of help in understanding the mechanics of the inversion process. A few predicted results which include the geometry of inverted tube, load-compression variation during inversion process are compared with their experimental counterparts to validate the computational model.

show abstract

Approximate analysis of structures in the presence of moderately large creep deformations

Cited by 209 publications

References 4 publications

The Numerical and Experimental Analysis of Ballizing Process of Steel Tubes

The Numerical and Experimental Analysis of Ballizing Process of Steel Tubes

The Development and Numerical Analysis of the Conical Radiator Extrusion Process

Investigation of External Inversion of Thin-Walled Tubes

Contact Info

Product

Resources

About