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BOUNDARY ELEMENTS NEWS PUBLICATIONS
FORTHCOMING EVENTS
Boundary Element Methods in Engineering Proceedings of the Fourth International Conference on Boundary Element Methods in Engineering The last three boundary element conferences have been characterised by papers reflecting a tentative trust in nonlinear and time dependent problems, and an increasing awareness of the potentialities of the technique for linear problems. The emphasis on nonlinear applications is more marked in the contributions in this volume which are the edited proceedings of the Fourth International Conference. This conference has consolidated the newly found confidence in the future of the method. These proceedings cover the solution of a wide range of new problems and applications, including mathematical and genetical nonlinear problems. Time dependent and vibration studies are also well represented in the volume. The practical applications and industrial uses of boundary element codes are well covered, and the healthy growth of the technique is here apparent as an accepted tool of engineering analysis. The book consists of 42 papers written by internationally well known practitioners. The book can be obtained from CML Publications, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Price £44.00.
Boundary Elemen ts for Po ten tial Problems 23-25 November 1982 Southampton, England The boundary element (or integral) method is a technique which offers important advantages over domain type solutions such as finite element and finite differences. One of the most interesting features of the method is the much smaller system of equations and considerable reduction in the data required to solve a problem. In addition the numerical accuracy of the boundary element method is generally greater than that of finite elements. These advantages are marked in two and three dimensional problems. The method is also well suited to problem solving with infinite domains such as those frequently occurring in engineering for which the classical domain, i.e. finite element and finite difference methods are unsuitable. The course presents the boundary element method as an approximate technique and includes its latest developments such as isoparametric elements, multiple problems, special boundary conditions etc. The workshop sessions will help the participants to understand the applications of the techniques in different types of potential problems. This course is of fundamental importance to engineers in industry and other establishments who need to be aware of new solution techniques more efficient than classical finite elements or finite differences. Further details can be obtained from the Courses Department, Computational Mechanics Centre, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Tel. (042 129) 3223.
Boundary Element Methods in Solid Mechmffcs S. L. Crouch and A. M. Starfield The boundary element technique - an inherently simple and flexible method of numerical analysis for boundary value problems in science and engineering is presented in this book lucidly and with a practical approach. The authors drawing on 14 years of practical experience and research, have faced squarely the problems supposedly associated with the boundary element method: computer programs of restricted applicability, abstruse theoretical discussion, and limited evidence of its general usefulness beyond the context of a particular problem. Throughout the book the mathematics is kept as simple as possible and at every opportunity the physical aspects are emphasised to demonstrate its meaning and usefulness. The modular structures of the method is highlighted to show how it can readily be modified to meet particular goals. The approach is flexible, structured and problem oriented. The book begins with an overview touching on various physical phenomena amenable to boundary element methods and proceeds to concentrate on solid mechanics. After a review of the relevant aspects of the theory of elasticity a simple boundary element method is developed from the Flamant solution for a line of concentrated force on the surface of an elastic half-plane thus demonstrating the constructive connection between solutions to simple and complex problems. Then 'indirect' and 'direct' methods for plane problems are developed, largely from a physical standpoint. The final chapter is devoted to extensions of boundary element methods and to techniques for refining solutions both general and specific. Finally applications in rock mechanics and geological engineering are given to illustrate how the methods lend themselves to an easy physical interpretation. Further details from College Sales Department, George Allen and Unwin, PO Box 18, Park Lane, Hemel Hempstead, Herts HP2 4TE.
Fifth International Conference on Boundary Element Methods in Engineering 8-11 November 1983 Hiroshima, Japan See ISCME Sponsored Conferences for preliminary announcement. RESEARCH AND SOFTWARE BEPLAX: A Boundary Element Program for the Solution of Axisymmetric Elastic Plastic Stress Analysis Problems This program is for the solution of axisymmetric elastic plastic problems by the boundary element method. Incremental elastic-plastic stress-strain relations are employed. The program is suited to a large variety of engineering problems in finite and infinite bodies. The advantage of the boundary element method applied to elasticity problems are retained, as problem unknowns are still defined on the boundary of the body. Internal cells are only required to represent plastic strains within the body. They are restricted to the region of plasticity and do not require any special~connectivity. In addition to a reduction in the amount of data required to run a problem comes a high level of numerical accuracy, compared with more complex finite element calculations. The program is capable of representing infinite domains without need to discretise the infinite boundary. Also, symmetrical bodies subject to symmetrical loads can be analysed without the discretisation of the symmetry axes, these features being unique to the boundary element technique, and in fact producing more accurate solutions.
Adv. Eng. Software. 1982, Vol. 4, No. 4
179
Programming characteristics Boundary elements- linear interpolation functions for tractions and boundary displacements. Internal cells -linear interpolation functions for plastic strains. Yield criterion- Von Mises (isotropic hardening) with
the possibility of linear strain hardening, ideal plasticity and linear strain softening. Further details from Computational Mechanics Centre, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Tel. (0421 293) 3223.
AUTHOR INDEX 148
Abass, O.
An householder IQL algorithm for the functional eigenproblem
Adey, R. A.
The BEASY system
Alarcon, E.
The effect of the boundary condition in the numerical solution of 3-D thermoelastic problems
112
The effect of the boundary condition in the numerical solution of 3-D thermoelastic problems
112
Anza, J. J. Baker, R. G. V.
The analysis of travel utility response at a set of lights
Biddlecombe, C. S.
Computer applications in electrical and electronic engineering
Boissier, P.
Technical and economic evaluations with microcomputer for the preliminary building design stage
68
90 2 143
Boyd, D. R. S.
Computer applications in electrical and electronic engineering
Brebbia, C. A.
The BEASY system
Camero, R.
Comparison of three methods of numerical differentiation
Carpenter, J. S.
Mini-computer based data acquisition and control software for the experimental evaluation of structures
46
Cross, M.
Interactive discrete event simulation without programming
26
Crowhurst, P. D.
Computer apphcations in electrical and electronic engineering
Dufau, J.
Technical and economic evaluations with microcomputer for the preliminary building design stage
2 68 167
2 143
Danson, D.
The BEASY system
68
Day, R.
Geoshare - the development of a data bank of geological records
136
Engleman, M. S.
FIDAP
163
Felippa, C. A.
Fortran 77. Simulation of word addressable files
156
Floriani, L. de
A minicomputer system for the study of wave refraction
152
Gorczynski, E. W.
Development of chemical engineering software using a Fortran preprocessor
107
Haftka, R. T.
Organisation of PARS - a structural resizing system
180
Adv. Eng. Software. 1982, VoL 4, No. 4
9
FORTHCOMING EVENTS
Boundary Element Methods in Engineering Proceedings of the Fourth International Conference on Boundary Element Methods in Engineering The last three boundary element conferences have been characterised by papers reflecting a tentative trust in nonlinear and time dependent problems, and an increasing awareness of the potentialities of the technique for linear problems. The emphasis on nonlinear applications is more marked in the contributions in this volume which are the edited proceedings of the Fourth International Conference. This conference has consolidated the newly found confidence in the future of the method. These proceedings cover the solution of a wide range of new problems and applications, including mathematical and genetical nonlinear problems. Time dependent and vibration studies are also well represented in the volume. The practical applications and industrial uses of boundary element codes are well covered, and the healthy growth of the technique is here apparent as an accepted tool of engineering analysis. The book consists of 42 papers written by internationally well known practitioners. The book can be obtained from CML Publications, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Price £44.00.
Boundary Elemen ts for Po ten tial Problems 23-25 November 1982 Southampton, England The boundary element (or integral) method is a technique which offers important advantages over domain type solutions such as finite element and finite differences. One of the most interesting features of the method is the much smaller system of equations and considerable reduction in the data required to solve a problem. In addition the numerical accuracy of the boundary element method is generally greater than that of finite elements. These advantages are marked in two and three dimensional problems. The method is also well suited to problem solving with infinite domains such as those frequently occurring in engineering for which the classical domain, i.e. finite element and finite difference methods are unsuitable. The course presents the boundary element method as an approximate technique and includes its latest developments such as isoparametric elements, multiple problems, special boundary conditions etc. The workshop sessions will help the participants to understand the applications of the techniques in different types of potential problems. This course is of fundamental importance to engineers in industry and other establishments who need to be aware of new solution techniques more efficient than classical finite elements or finite differences. Further details can be obtained from the Courses Department, Computational Mechanics Centre, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Tel. (042 129) 3223.
Boundary Element Methods in Solid Mechmffcs S. L. Crouch and A. M. Starfield The boundary element technique - an inherently simple and flexible method of numerical analysis for boundary value problems in science and engineering is presented in this book lucidly and with a practical approach. The authors drawing on 14 years of practical experience and research, have faced squarely the problems supposedly associated with the boundary element method: computer programs of restricted applicability, abstruse theoretical discussion, and limited evidence of its general usefulness beyond the context of a particular problem. Throughout the book the mathematics is kept as simple as possible and at every opportunity the physical aspects are emphasised to demonstrate its meaning and usefulness. The modular structures of the method is highlighted to show how it can readily be modified to meet particular goals. The approach is flexible, structured and problem oriented. The book begins with an overview touching on various physical phenomena amenable to boundary element methods and proceeds to concentrate on solid mechanics. After a review of the relevant aspects of the theory of elasticity a simple boundary element method is developed from the Flamant solution for a line of concentrated force on the surface of an elastic half-plane thus demonstrating the constructive connection between solutions to simple and complex problems. Then 'indirect' and 'direct' methods for plane problems are developed, largely from a physical standpoint. The final chapter is devoted to extensions of boundary element methods and to techniques for refining solutions both general and specific. Finally applications in rock mechanics and geological engineering are given to illustrate how the methods lend themselves to an easy physical interpretation. Further details from College Sales Department, George Allen and Unwin, PO Box 18, Park Lane, Hemel Hempstead, Herts HP2 4TE.
Fifth International Conference on Boundary Element Methods in Engineering 8-11 November 1983 Hiroshima, Japan See ISCME Sponsored Conferences for preliminary announcement. RESEARCH AND SOFTWARE BEPLAX: A Boundary Element Program for the Solution of Axisymmetric Elastic Plastic Stress Analysis Problems This program is for the solution of axisymmetric elastic plastic problems by the boundary element method. Incremental elastic-plastic stress-strain relations are employed. The program is suited to a large variety of engineering problems in finite and infinite bodies. The advantage of the boundary element method applied to elasticity problems are retained, as problem unknowns are still defined on the boundary of the body. Internal cells are only required to represent plastic strains within the body. They are restricted to the region of plasticity and do not require any special~connectivity. In addition to a reduction in the amount of data required to run a problem comes a high level of numerical accuracy, compared with more complex finite element calculations. The program is capable of representing infinite domains without need to discretise the infinite boundary. Also, symmetrical bodies subject to symmetrical loads can be analysed without the discretisation of the symmetry axes, these features being unique to the boundary element technique, and in fact producing more accurate solutions.
Adv. Eng. Software. 1982, Vol. 4, No. 4
179
Programming characteristics Boundary elements- linear interpolation functions for tractions and boundary displacements. Internal cells -linear interpolation functions for plastic strains. Yield criterion- Von Mises (isotropic hardening) with
the possibility of linear strain hardening, ideal plasticity and linear strain softening. Further details from Computational Mechanics Centre, Ashurst Lodge, Ashurst, Southampton SO4 2AA. Tel. (0421 293) 3223.
AUTHOR INDEX 148
Abass, O.
An householder IQL algorithm for the functional eigenproblem
Adey, R. A.
The BEASY system
Alarcon, E.
The effect of the boundary condition in the numerical solution of 3-D thermoelastic problems
112
The effect of the boundary condition in the numerical solution of 3-D thermoelastic problems
112
Anza, J. J. Baker, R. G. V.
The analysis of travel utility response at a set of lights
Biddlecombe, C. S.
Computer applications in electrical and electronic engineering
Boissier, P.
Technical and economic evaluations with microcomputer for the preliminary building design stage
68
90 2 143
Boyd, D. R. S.
Computer applications in electrical and electronic engineering
Brebbia, C. A.
The BEASY system
Camero, R.
Comparison of three methods of numerical differentiation
Carpenter, J. S.
Mini-computer based data acquisition and control software for the experimental evaluation of structures
46
Cross, M.
Interactive discrete event simulation without programming
26
Crowhurst, P. D.
Computer apphcations in electrical and electronic engineering
Dufau, J.
Technical and economic evaluations with microcomputer for the preliminary building design stage
2 68 167
2 143
Danson, D.
The BEASY system
68
Day, R.
Geoshare - the development of a data bank of geological records
136
Engleman, M. S.
FIDAP
163
Felippa, C. A.
Fortran 77. Simulation of word addressable files
156
Floriani, L. de
A minicomputer system for the study of wave refraction
152
Gorczynski, E. W.
Development of chemical engineering software using a Fortran preprocessor
107
Haftka, R. T.
Organisation of PARS - a structural resizing system
180
Adv. Eng. Software. 1982, VoL 4, No. 4
9