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Article
Publication date: 1 May 1994

N. Brännberg and J. Mackerle

This paper gives a review of the finite element techniques (FE)applied in the area of material processing. The latest trends in metalforming, non‐metal forming and powder…

1467

Abstract

This paper gives a review of the finite element techniques (FE) applied in the area of material processing. The latest trends in metal forming, non‐metal forming and powder metallurgy are briefly discussed. The range of applications of finite elements on the subjects is extremely wide and cannot be presented in a single paper; therefore the aim of the paper is to give FE users only an encyclopaedic view of the different possibilities that exist today in the various fields mentioned above. An appendix included at the end of the paper presents a bibliography on finite element applications in material processing for the last five years, and more than 1100 references are listed.

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Engineering Computations, vol. 11 no. 5
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 June 1997

Jaroslav Mackerle

Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the…

6101

Abstract

Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical as well as practical points of view. The range of applications of FEMs in this area is wide and cannot be presented in a single paper; therefore aims to give the reader an encyclopaedic view on the subject. The bibliography at the end of the paper contains 2,025 references to papers, conference proceedings and theses/dissertations dealing with the analysis of beams, columns, rods, bars, cables, discs, blades, shafts, membranes, plates and shells that were published in 1992‐1995.

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Engineering Computations, vol. 14 no. 4
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 April 1987

J.M.A. Cesar de Sa and D.R.J. Owen

The application of numerical techniques to the solution of practical problems which exist in rubber technology is described. Structures and components in the form of reinforced…

77

Abstract

The application of numerical techniques to the solution of practical problems which exist in rubber technology is described. Structures and components in the form of reinforced rubber shells are widely used in industry and prediction of their performance is complicated by both the anisotropic nature of composite construction and the incompressible behaviour of the basic material. A layered shell element is developed for the solution of such problems with general anisotropic behaviour independently permitted in each layer. The approach adopted permits the easy location of reinforcement patterns. Numerical solution is based on a single field formulation by eliminating at integrating point level the Lagrange multiplier imposing the incompressible constraint. Large deformation, including large rotation, behaviour is accommodated and a total Lagrangian solution process is adopted. The code developed permits the simulation of non‐conservative loading and its versatility is demonstrated by the solution of some practical examples.

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Engineering Computations, vol. 4 no. 4
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 March 1994

E.A. De Souza Neto, Djordje Perić and D.R.J. Owen

This work addresses the computational aspects of a model forelastoplastic damage at finite strains. The model is a modification of apreviously established model for large strain…

355

Abstract

This work addresses the computational aspects of a model for elastoplastic damage at finite strains. The model is a modification of a previously established model for large strain elastoplasticity described by Perić et al. which is here extended to include isotropic damage and kinematic hardening. Within the computational scheme, the constitutive equations are numerically integrated by an algorithm based on operator split methodology (elastic predictor—plastic corrector). The Newton—Raphson method is used to solve the discretized evolution equations in the plastic corrector stage. A numerical assessment of accuracy and stability of the integration algorithm is carried out based on iso‐error maps. To improve the stability of the local N—R scheme, the standard elastic predictor is replaced by improvedinitial estimates ensuring convergence for large increments. Several possibilities are explored and their effect on the stability of the N—R scheme is investigated. The finite element method is used in the approximation of the incremental equilibrium problem and the resulting equations are solved by the standard Newton—Raphson procedure. Two numerical examples are presented. The results are compared with those obtained by the original elastoplastic model.

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Engineering Computations, vol. 11 no. 3
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 13 March 2007

K. Han, Y.T. Feng and D.R.J. Owen

The main purpose of this paper is to compare the performance of three commonly used global search algorithms, namely tree‐based augmented spatial digital tree, cell‐based no…

577

Abstract

Purpose

The main purpose of this paper is to compare the performance of three commonly used global search algorithms, namely tree‐based augmented spatial digital tree, cell‐based no binary search and D‐cell, in the discrete element simulations.

Design/methodology/approach

A large number of test cases with up to five million particles/discrete objects are employed to numerically examine the computational costs of the three search algorithms and their performance is compared.

Findings

Comprehensive comparisons reveal that the D‐cell is more efficient than the tree‐based search algorithms for large‐scale problems. The parametric study of the D‐cell algorithm itself shows that the performance of the algorithm is strongly dependent on the cell dimension chosen.

Research limitations/implications

The only limitation of the current work is that the tested domain shape is regular, and thus more complex domain shapes may need to be considered.

Originality/value

The paper provides clear guidance regarding the possible actual computational performance of the tested search algorithms for practical applications.

Details

Engineering Computations, vol. 24 no. 2
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 March 1995

D.R.J. Owen, S.Y. Zhao and J.G. Loughran

A finite element solution to the rolling of two‐phase materials ispresented and applied to the rolling of prepared sugar cane. The generalizedBiot theory is extended and modified…

126

Abstract

A finite element solution to the rolling of two‐phase materials is presented and applied to the rolling of prepared sugar cane. The generalized Biot theory is extended and modified to suit the present problem and the velocity of the solid skeleton and the pore pressure are taken as the primary unknowns. The finite element approach is applied to the governing equations for spatial discretization, followed by time domain discretization by standard difference methods. A constitutive relation evaluated from a finite element simulation of experiments performed on a constrained compression test cell is employed. The computational model of the rolling of prepared cane with two rolls is presented. The material parameters of prepared cane are described and their variation during the rolling process are derived and discussed. Numerical results are presented to illustrate the performance and capability of the model and solution procedures.

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Engineering Computations, vol. 12 no. 3
Type: Research Article
ISSN: 0264-4401

Keywords

Available. Open Access. Open Access
Article
Publication date: 15 January 2010

K. S. U. Jayaratne, Mitchell Owen and David Jones

This leadership education evaluation study explored the leadership development outcomes of potential county extension directors and the ways to improve the program. The leadership…

47

Abstract

This leadership education evaluation study explored the leadership development outcomes of potential county extension directors and the ways to improve the program. The leadership education program aimed to improve participants’ leadership abilities in understanding self, building relationships and managing resources. The analysis of quantitative and qualitative data confirmed that the leadership training institute was effective in building participants’ leadership skills and improving leadership behavior. The incorporation of participants’ learning needs into the program, use of hands-on experiential learning activities and problem solving activities combined with small group discussions were the contributing factors for the success of this leadership education program. The participants suggested the use of more hands-on and problem solving activities, team building exercises and condensing the time gap between the pre and post sessions as strategies for further improvement of this program.

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Journal of Leadership Education, vol. 9 no. 1
Type: Research Article
ISSN: 1552-9045

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Article
Publication date: 1 February 1996

Jaroslav Mackerle

Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included…

677

Abstract

Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included at the end of the paper presents a bibliography on the subjects retrospectively to 1985 and approximately 1,100 references are listed.

Details

Engineering Computations, vol. 13 no. 1
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 10 February 2012

Rob Gray and Richard Laughlin

The purpose of this paper is to revisit the special issue of Accounting, Auditing & Accountability Journal which was published in 1991 and which sought to stimulate the “green…

6747

Abstract

Purpose

The purpose of this paper is to revisit the special issue of Accounting, Auditing & Accountability Journal which was published in 1991 and which sought to stimulate the “green accounting” debate, to evaluate that issue and, in particular, to examine what we might learn about the development of the social and environmental accounting literature in the last 20 years.

Design/methodology/approach

The paper takes the form of a discursive, polemical essay.

Findings

The special issue exhibited a wide range of approaches and possibilities; it also exhibited some theoretical naivety and a charming optimism and fetching trust in the power of reasonable argument. Retrospectively, the field has expanded considerably and has made many advances in theoretical and empirical understanding but researchers appear to be less willing to examine the fundamental issues that originally motivated the development of the field.

Research limitations/implications

The implications and limitations stem from the ambitions of this discursive attempt to encourage debate of a more direct and confrontational nature – both within and at the margins of social, environmental and sustainability accounting.

Originality/value

The originality and value of the paper is in its critical engagement with the literature and ideas of social accounting, which is the generic descriptor used in the paper to include “green accounting”. It provides not only an analysis of the achievement of the work to date but some critical pointers to the work that still needs to be done.

Details

Accounting, Auditing & Accountability Journal, vol. 25 no. 2
Type: Research Article
ISSN: 0951-3574

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Article
Publication date: 1 April 1988

G.P. Mitchell and D.R.J. Owen

Recent publications have highlighted the effectiveness of using a consistent tangent modulus when solving elastic‐plastic problems. The formulation of a consistent tangent modulus…

329

Abstract

Recent publications have highlighted the effectiveness of using a consistent tangent modulus when solving elastic‐plastic problems. The formulation of a consistent tangent modulus is closely related to the scheme used to integrate the constitutive equations. Recent work has shown how many of these schemes currently in use can be derived from certain broad classes of algorithms. In this paper these procedures are examined for a number of commonly used yield/failure criteria. For certain cases a remarkably simple formulation results which can lead to considerable savings in computational time.

Details

Engineering Computations, vol. 5 no. 4
Type: Research Article
ISSN: 0264-4401

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