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Article
Publication date: 1 May 1992

H.J. ANTÚNEZ and S.R. IDELSOHN

The pseudo‐concentration method is applied to the analysis of transient processes. A simple, easy‐to‐handle model is obtained by keeping an Eulerian description: it does not…

Abstract

The pseudo‐concentration method is applied to the analysis of transient processes. A simple, easy‐to‐handle model is obtained by keeping an Eulerian description: it does not require remeshing after a certain amount of plastic deformation. The range of applicability of the method is extended to non‐confined (even with several free surfaces) processes. It is shown the need of distinct handling of free surfaces according to their orientation to the direction of the flow. A seamless tube rolling process, a cylinder upsetting and a backward extrusion are modelled. Experimental data and results obtained by other methods are used to compare and discuss the performance of the model.

Details

Engineering Computations, vol. 9 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

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…

1451

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.

Details

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

Keywords

Article
Publication date: 1 March 1995

M. Kleiber, T.D. Hien, H. Antúnez and P. Kowalczyk

The general problem of sizing, material and loading parameter sensitivity of non‐linear systems is presented. Both kinematic and path‐dependent material non‐linearities are…

Abstract

The general problem of sizing, material and loading parameter sensitivity of non‐linear systems is presented. Both kinematic and path‐dependent material non‐linearities are considered; non‐linear sensitivity path is traced by an incremental solution strategy. The variational approach employed is quite general and can be employed for studying sensitivity of various path‐dependent highly non‐linear phenomena. Both the direct differentiation method (DDM) and adjoint system method (ASM) are discussed in the context of continuum and finite element mechanics. The merits of using the consistent tangent matrix and the necessity of accumulation of design derivatives of stresses and internal parameters are indicated. Aspects of sensitivity problems in metal forming are also discussed. A number of examples illustrate the paper.

Details

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

Keywords

Article
Publication date: 1 August 1998

Jaroslav Mackerle

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, powder…

4540

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, powder metallurgy and composite material processing are briefly discussed. The range of applications of finite elements on these subjects is extremely wide and cannot be presented in a single paper; therefore the aim of the paper is to give FE researchers/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 1994‐1996, where 1,370 references are listed. This bibliography is an updating of the paper written by Brannberg and Mackerle which has been published in Engineering Computations, Vol. 11 No. 5, 1994, pp. 413‐55.

Details

Engineering Computations, vol. 15 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 April 2006

Jaroslav Mackerle

To provide a selective bibliography for researchers working with bulk material forming (specifically the forging, rolling, extrusion and drawing processes) with sources which can…

4734

Abstract

Purpose

To provide a selective bibliography for researchers working with bulk material forming (specifically the forging, rolling, extrusion and drawing processes) with sources which can help them to be up‐to‐date.

Design/methodology/approach

A range of published (1996‐2005) works, which aims to provide theoretical as well as practical information on the material processing namely bulk material forming. Bulk deformation processes used in practice change the shape of the workpiece by plastic deformations under forces applied by tools and dies.

Findings

Provides information about each source, indicating what can be found there. Listed references contain journal papers, conference proceedings and theses/dissertations on the subject.

Research limitations/implications

It is an exhaustive list of papers (1,693 references are listed) but some papers may be omitted. The emphasis is to present papers written in English language. Sheet material forming processes are not included.

Practical implications

A very useful source of information for theoretical and practical researchers in computational material forming as well as in academia or for those who have recently obtained a position in this field.

Originality/value

There are not many bibliographies published in this field of engineering. This paper offers help to experts and individuals interested in computational analyses and simulations of material forming processes.

Details

Engineering Computations, vol. 23 no. 3
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 April 1993

EDUARDO N. DVORKIN and EVA G. PETÖCZ

In order to develop an engineering tool for modelling 2D metal forming processes we implemented in the flow formulation the pseudo‐concentrations technique and a quadrilateral…

Abstract

In order to develop an engineering tool for modelling 2D metal forming processes we implemented in the flow formulation the pseudo‐concentrations technique and a quadrilateral element based on mixed interpolation of tensorial components (QMITC). By doing this we obtained a reliable and efficient Eulerian formulation for modelling steady and transient metal forming problems. Some cases were analysed in order to test the performance of the formulation.

Details

Engineering Computations, vol. 10 no. 4
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 April 1994

R. Codina, U. Schäfer and E. Oñate

In this paper we consider several aspects related to the application ofthe pseudo‐concentration techniques to the simulation of mould fillingprocesses. We discuss, in particular…

Abstract

In this paper we consider several aspects related to the application of the pseudo‐concentration techniques to the simulation of mould filling processes. We discuss, in particular, the smoothing of the front when finite elements with interior nodes are employed and the evacuation of air through the introduction of temporary free wall nodes. The basic numerical techniques to solve the incompressible Navier—Stokes equations are also briefly described. The main features of the numerical model are the use of div‐stable velocity—pressure interpolations with discontinuous pressures, the elimination of the pressure via an iterative penalty formulation, the use of the SUPG approach to deal with convection‐dominated problems and the temporal integration using the generalized trapezoidal rule. At the end of the paper we present some numerical results obtained for a two‐dimensional test problem showing the ability of the method to capture complicated flow patterns.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 4 no. 4
Type: Research Article
ISSN: 0961-5539

Keywords

Book part
Publication date: 28 May 2019

Serafín Antúnez, Patricia Silva and Charles L. Slater

Directing schools of high complexity in disadvantaged social contexts with high rates of emigration requires skills for emotional leadership. Directors with self-managing…

Abstract

Directing schools of high complexity in disadvantaged social contexts with high rates of emigration requires skills for emotional leadership. Directors with self-managing capacities are needed to manage their own emotions. They also need to mobilise people (teachers, students and families) by focussing on their feelings of satisfaction, identification with the group, belonging, joy, success, unity and cohesion.

The content of this chapter presents the study of the emotional management of directors who perform their work in two highly complex schools in Catalonia, Spain. The views of these directors as well as teachers and families examine: (1) the construction of their professional identity, (2) their social and ethical commitment to the community, (3) the orientation towards the values of social justice and (4) their emotional leadership practices focussed on personal attention towards all of the actors in the school community.

The chapter concludes with 10 suggestions that can be useful to improve the professional practice of school directors. These should also be taken into account when designing and implementing initial and ongoing training programmes for school leaders and to inspire ideas for future research.

Details

Emotion Management and Feelings in Teaching and Educational Leadership
Type: Book
ISBN: 978-1-78756-011-6

Keywords

Book part
Publication date: 23 April 2024

Mercedes Huerta-Soto, Karin De la Cruz Inchicaqui, Hugo Marino Rodríguez-Orellana, Orlando Leiva-Chauca and Hernan Ramirez-Asis

Science and technology are transforming our world in ways that have not been seen in a long time, and we live in a rapidly changing world. Despite these changes, as citizens of…

Abstract

Science and technology are transforming our world in ways that have not been seen in a long time, and we live in a rapidly changing world. Despite these changes, as citizens of today, we must not lose sight of the reality that these changes even cause crises that must be managed in order to place ourselves in a true working environment that allows us to survive as employees despite these changes. The main objective of this research is to find the relationship between interpersonal competences and teacher performance in a sustainable university. The methodology used was the quantitative, nonexperimental approach, as the variables will not be deliberately manipulated. In order to verify whether or not there was a relationship between these variables, 84 teachers from the Universidad Nacional Santiago Antunez de Mayolo were surveyed to evaluate the variables under study. The results obtained show a direct and significant relationship (Spearman's Rho = 0.731) between the two variables. Through this research, it was possible to determine that teachers who have developed interpersonal competences have a better performance, while in the relationships between interpersonal competences and the dimensions of teacher performance, a positive correlation was obtained.

Details

Technological Innovations for Business, Education and Sustainability
Type: Book
ISBN: 978-1-83753-106-6

Keywords

Book part
Publication date: 10 July 2019

Serafín Antúnez, Patricia Silva and Charles Slater

This study presents two ideas. The first is that schools supported by public funds are challenged to help ensure that all students, without exception, have opportunities to…

Abstract

This study presents two ideas. The first is that schools supported by public funds are challenged to help ensure that all students, without exception, have opportunities to develop their skills, especially for those who are in more precarious situations and at risk of social exclusion. The second idea is that respecting the rights of all students is a prerequisite for achieving desirable social justice.

The content of the chapter communicates the process, results and conclusions of data obtained in four schools in Catalonia Spain. On the one hand, it is a study of the conceptions of directors, teachers and families on social justice and respect for rights in school, and on the other hand, it is an analysis of the professional practices of managers and teachers.

There were two fundamental conclusions. The first conclusion identifies the professional practices carried out in the schools to attend to the cultural and linguistic rights of the students. The second conclusion provided steps that could be taken to move towards social justice, especially in disadvantaged contexts.

Details

Education, Immigration and Migration
Type: Book
ISBN: 978-1-78756-044-4

Keywords

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