ACME 2011 Proceedings of the 19 UK National Conference of the ...

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First published 2011 by Heriot-Watt University ISBN 978-0-9565951-1-9 British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library Copyright © 2011 Heriot-Watt University. All rights reserved. No parts of this publication may be produced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the Heriot-Watt University, Edinburgh, UK. Printed and bound by Heriot-Watt University Media Services Riccarton Campus Edinburgh EH14 4AS
PREFACE These Proceedings contain more than 70 extended abstracts of the work presented at the 19 th Annual Conference of the UK Association for Computational Mechanics in Engineering (ACME) held at the Heriot-Watt University in Edinburgh on 5 th and 6 th April 2011. The Association was founded with the aims of promoting research in computational mechanics in engineering within the UK, and establishing formal links with similar organisations in Europe and the International Association for Computational Mechanics (IACM). The principal activity of ACME involves the organisation of the annual conference. The first such conference took place at the University College of Wales Swansea in 1993. The conferences have provided a forum for reviewing research activities in many areas of mechanics, with an emphasis on interdisciplinary aspects. The conferences have proved to be particularly useful events for drawing together researchers from different disciplines, and especially for providing young researchers with opportunities for presenting their work. The organisers of the 19th ACME Conference took the initiative to organise the 1 st ACME School, initially proposed by Professor Nenad Bicanic and other AMCE members. Many thanks to the lecturers of this School: Professor Harm Askes, Professor Jon Trevelyan and Dr. Charles Augarde, who made it happen. It is hoped the ACME School becomes part of the future annual ACME Conferences. I would like to express my gratitude to the three invited speakers for their contribution to the conference and the time and effort they put. I would like to acknowledge the assistance of Ms Anne Ormston who has played an invaluable role in organising the Conference. I hope you enjoy your stay in the historic city of Edinburgh and the ACME meeting. Omar Laghrouche Vice-Chairman of ACME 2010/11
Page 1: ACME 2011 Proceedings of the 19 th
Page 7 and 8: CONTENTS Invited Lectures CHALLENGE
Page 9 and 10: A DAMAGE-MECHANICS-BASED RATE-DEPEN
Page 11: A PROJECTED QUASI-NEWTON METHOD FOR
Page 14 and 15: minimise the strain energy density.
Page 16 and 17: through individual rock blocks and
Page 18 and 19: (a) Finite element mesh (b) Gas mes
Page 21 and 22: Proceedings of the 19 th UK Confere
Page 23 and 24: T E −1 ( ) ( ) T ∂s ∂T − du
Page 27 and 28: nondimensional tangential velocity
Page 31 and 32: Figure 2: Results for an open arter
Page 35 and 36: (a) Abaqus model von Mises stress (
Page 39 and 40: Vle Vli De Di k1 (MPa) 8.34 2.11 1.
Page 43 and 44: 3 RESULTS AND DISCUSSIONS In this p
Page 47 and 48: The potential energy U of the tunne
Page 51 and 52: where the problem is formulated in
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Figure 1: 2D slope model geometry (
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Proceedings of the 19 th UK Confere
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Figure 1. Comparison between the pr
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following anisotropic hardening rel
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that R Γ Spin[N]XdΓ = 0, the func
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4 INCORPORATING EPRCM IN FEA The de
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No distinct yield point is observed
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stress [MPa] 1 0 -1 -2 -3 -2.5 -2 -
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ecomes available, the material mode
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where ∂fin ∂UM force 2.5 2 1.5
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Practicallly, the perturbation fiel
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3 SIMULATING CONCRETE MESO-STRUCTUR
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¯K i is an approximation of the co
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h = 5.36 matrix 4.3 z P E f νf 0.9
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From the total hoop strainε θ , t
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3 EXTERIOR POINT ESHELBY BASED CRAC
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is applied uniformly on the edge to
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(a) (b) (c) (d) Figure 1: Influence
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On each subdomain, we then have to
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( i�1) ( i�1) �Un�1 � ε
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� ~ � 1 ψ ~ � � ~ (2) �
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For the case of uni-axial tension,
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3 Numerical results Preliminary num
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The coefficients An cannot be deriv
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The spatial semi-discretisation is
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3 CRITICAL TIME STEP INCREASED WITH
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v/vo 2E-05 1.5E-05 1E-05 5E-06 0 -3
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3 RESULTS AND DISCUSSION Fig. 1a sh
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Model updating from eigenvalue and
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1. If R = ω 2 n, there is no eigen
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F = ´ Ω STv CSv dΩ A = ´ Γ U
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Fig. 3 Wall normal pressure in the
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contact contact (ii). f ≈ f ( d,
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In the analysis of the incident P-w
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elow a certain threshold. In both t
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K/d 2 Effective Permeability 0.0032
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METHOD 2 (Mellor and Herring Type)
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(a) Free Surface Profile from Janos
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2 IMMERSED FLUID SOLVER Consider th
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References [1] R. Mittal and G. Iac
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a second impact on the forward fuse
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Acknowledgement L. Papagiannis is f
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acceptable probability throughout t
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algorithm was then responsible for
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strategy of saving the computationa
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(a) (b) Figure 5. Comparison of (a)
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Thermal load step i i i i Update ,
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Displacement (mm) Conclusions 45 40
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load carrying of the structure to b
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compressive stress field between co
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Unbonded flexible pipes and risers
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Figure 2: (a) Riser configuration (
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Furthermore the total strain varies
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Displacement 14 12 10 8 6 4 2 0 Mem
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As this project was in the conceptu
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kg and additional mass to represent
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1 Step make box 2 Step make cylinde
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element method. The solid model is
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just new element classes) without t
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Fig.4. Frame model and the displace
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capacities to meet with such demand
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esponses. Severe cases are to be co
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2 Numerical results In this section
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the frequency intially increases un
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and F (R) = ⎡ ⎢ ⎣ ... UαT (R
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Merit function g 10 1 10 0 10 -1 10
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2 STRUCTURAL CHARACTERISTICS OF PTM
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Fig. 5. Simplified FE model of a PT
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general the computational results o
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References [1] Ainsworth M, Oden JT
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Error Cause Interpolation Error Ele
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(a) Before Improvement (b) After Im
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een applied to FE fluid flow proble
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Acknowledgements Figure 2: Flowchar
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1 1 ′′ 1 ′′′ 3 ′′ 2
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3 COMBINING SHAPE FUNCTIONS The exp
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electron current). For the case of
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electron concentration (1/cm 3 ) x
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2 CONSERVATION LAW FOR A MOVING CV
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5 NUMERICAL RESULTS A 1-D cellular
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FEM can be found in [3]. In this pa
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h Y 1 0 −1 −2 −3 −4 −5
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applications. The partition of unit
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1.1 1.05 1 0.95 0.9 0.85 0.8 0.75 2
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2 NURBS BASIS FUNCTIONS NURBS are a
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4 RESULTS To illustrate the isoBEM
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290
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1 1 2 { σ ( ξ, s) } = [ D] { ε (
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4.4 Example 4 - A single edge crack
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