Technical publications

Technical publications - written by Zentech personnel, or co-authored with other companies, for presentation at various international forums - include:

Simulation Of 3D Non-Planar Crack Propagation
R. Chandwani, C. Timbrell
NAFEMS World Congress 2007, Vancouver, Canada, May 22-25 2007.
PDF document (2340Kb)

Crack Modelling In Power Plant Components
R. Chandwani, C. Timbrell, M. Wiehahn
International Conference On Pressure Vessels And Piping, Chennai, India, Feb 7-9 2006.
PDF document (3568Kb)

An FE Simulation Tool For Fracture Mechanics
R. Chandwani, C. Timbrell, M. Wiehahn
International Seminar on "Fatigue, Reliability & Performance Considerations In Design", Indian Institute of Science, Bangalore, India, Jul 14-15 2005.
PDF document (1602Kb)

Stress Intensity Factors For Cracked Plates Under Out-of-plane Bending
M.R. Roy, J.D.G. Sumpter, QinetiQ, Rosyth Business Park, Dunfermline
C. Timbrell, M. Wiehahn, Zentech International Ltd.
Abaqus Users' Conference, Stockholm, Sweden, May 18-20 2005.
PDF document (546kb)

3D Fracture Mechanics In Ansys
R. Chandwani, M. Wiehahn, C. Timbrell
2004 UK Ansys Conference, Stratford-upon-Avon, England, Nov 15-16 2004.
PDF document (724Kb)

State Of The Art In Crack Propagation
C. Timbrell, R. Chandwani, G. Cook
Journée Scientifique 2004: Les méthodes de dimensionnement en fatigue, Centre de Compétences Matériaux & Conception (CCM&C), Fribourg, Switzerland, Oct 27 2004.
PDF document (2557Kb)

Residual Stress in a 3D Finite Element Fracture Mechanics Analysis
C. Timbrell, R. Chandwani
FENET Technology Workshops - Durability and Life Extension, Palma, Majorca, Mar 25-26 2004.
Powerpoint presentation (485Kb) - No formal paper or proceedings published for this conference

Failure Assessment Diagrams from 3D Finite Element Analysis
M. Wiehahn, C. Timbrell, R. Chandwani
FENET Technology Workshops - Durability and Life Extension, Palma, Majorca, Mar 25-26 2004.
Powerpoint presentation (1028Kb) - No formal paper or proceedings published for this conference

Recent Developments In 3D Fatigue Crack Growth Prediction Using The Finite Element Method
C. Timbrell, R. Chandwani, M. Wiehahn, G. Cook
FENET Technology Workshops - Durability and Life Extension, Noordwijk, The Netherlands, Oct 9-10 2003.
Powerpoint presentation (14Mb) - No formal paper or proceedings published for this conference

Simulation Of Crack Propagation In Rubber
C. Timbrell, M. Wiehahn & G. Cook, Zentech International Ltd., Camberley, Surrey, UK
A.H. Muhr, TARRC/Rubber Consultants, Hertford, UK
Proceedings of the Third European Conference On Constitutive Models For Rubber, London, England, Sep 15-17 2003.
PDF document (299Kb)

Using Abaqus To Analyse Fatigue Crack Growth Under The Combined Influence Of Residual Stress And Cyclic External Load
G. Cook, C. Timbrell, M. Wiehahn
Abaqus UK Users Group Conference, Warrington, England, Nov 12-13 2002.
PDF document (209Kb)

The Application of 3D Finite Element Analysis to Engine Life Prediction
G. Cook, C. Timbrell, B. Browning
Symposium on "Turbine Engine and Airframe Sustainment", AeroMat 2001 - 12^th Advanced Aerospace Materials & Processes Conference & Exhibition, Long Beach, CA, U.S.A., June 11-14 2001.
PDF document (4141Kb)

Predicting Large Scale Crack Growth In 3D Finite Element Models
B. Browning, G. Cook, C. Timbrell
Abaqus Users' Conference, Maastricht, The Netherlands, May 30 - June 1 2001.
PDF document (529Kb)

3D Crack Analysis Using MSC.Marc
C.Timbrell, G.Cook, R.Chandwani
1^st Northern European Technology Conference, Manchester, England, June 7-8 2000.
PDF document (649Kb)

Design of Flexible Risers
R.Chandwani, I.Larsen
Proceedings of the "Workshop on Subsea Pipelines", COPPE/UFRJ-Federal University of Brasil, Rio de Janeiro, Brasil, December 8-9 1997.
HTML version

3D FE Fracture Mechanics Analysis for Industrial Applications
C.Timbrell, G.Cook
Seminar on "Inelastic Finite Element Analysis", Institute of Mechanical Engineers, London, October 14 1997.
PDF document (542Kb)

Analysing the Effects of Integrating Riser / Mooring Line Design
P.Chakrabarti, Zentech Inc.; R.Chandwani, I.Larsen, Zentech International
OMAE'96 Conference, Florence, Italy, June 16-20 1996.
HTML version

Rapid Application Development in PowerHouse : The Use of Iterative Development Techniques on a Large Project
N.Constable
Cognos North American User Conference, Ottowa, Canada, June 28-30 1995.
HTML version

Application of Abaqus to Analysis of 3D Cracks and Fatigue Crack Growth Prediction
C.Timbrell, P.W.Claydon, G.Cook
Abaqus Users' Conference, Rhode Island, U.S.A., June 1-3 1994.
PDF document (396Kb)

A Flexible Riser System for Multiple Use on Marginal Fields
R.Chandwani, D.Mahmood, I.Larsen, Zentech International; J.Neffgen, JMN & CEN Consultants, Scotland
Offshore and Arctic Operations - 16th Annual Energy Sources Technology Conference, Houston, February 1993.

Design Life Prediction of Flexible Riser Systems
G.Cook, P.W.Claydon
MARINFLEX 92 Conference on Flexible Pipes, Umbilicals, Marine Cables, London, November 1992
HTML version

Maximum Energy Release Rate Distribution From A Generalised 3D Virtual Crack Extension Method
P.W.Claydon
Engineering Fracture Mechanics, 42 (6), 1992.

A Theoretical Approach to Prediction of Service Life of Unbonded Flexible Pipes under Dynamic Loading Conditions
P.W.Claydon, G.Cook, P.A.Brown, R.Chandwani
Marine Structures Journal, October 1991.

The Design of Flexible Marine Risers in Deep and Shallow Water
D.Hoffman, HMC Offshore Corp.; N.M.Ismail, R.Nielsen, Wellstream Corp.; R.Chandwani, Zentech International Ltd.
OTC 6724, OTC Conference, Houston, May 6-9 1991.
HTML version

Interaction between Flexible Risers and Mooring Lines within a Floating Production System
P.A.Brown, R.Chandwani, I.Larsen, Zentech Consultants; E.Dasambiagio, Petrobras/Cenpes, Rio de Janeiro, Brazil
Latin American Petroleum Engineering Conference (LAPEC), Rio de Janeiro, Oct. 1990.

Fatigue Crack Growth Prediction in 3D Crack Fronts
G.Cook, P.W.Claydon, C.Timbrell
STRUCENG & FEMCAD Conference, Grenoble, France, 1990.
HTML version

Automatic and Adaptive Finite Element Mesh Generation For Full 3D Fatigue Crack Growth
G.Cook, C.Timbrell, P.W.Claydon
STRUCENG & FEMCAD Conference, Grenoble, France, 1990.
HTML version

Tools For Predicting Service Life Of Dynamic Flexible Risers
R.Nielsen, R.S.Colquhoun, A.McCone, Wellstream Corp.; J.A.Witz, Univ. College London; R.Chandwani, Zentech, London
Proceedings of Intl. Conf. EUROMS-90, Norway, Aug. 1990.

Investigation into Optimised Design of Flexible Riser Systems
P.A.Brown, A.Soltanahmadi, R.Chandwani, I.Larsen
The Institute of Marine Engineers, London, Oct. 1989.

Application of the Finite Difference Technique to the Analysis of Flexible Riser Systems
P.A.Brown, A.Soltanahmadi, R.Chandwani
CIVIL-COMP 89, Civil & Structural Engineering Conference, City University, London, Sept. 1989.

Transient Analysis of Liquid Pipeline Systems During ESV Trip
M.W.Spiteri, R.Chandwani
Proceedings of Seminar on Subsea Emergency Shutdown Systems, London, 1989.

Problems Encountered in Detailed Design of Flexible Risers
P.A.Brown, A.Soltanahmadi, R.Chandwani
International Seminar on Flexible Risers, University College, London, January 1989.

SIMULUS - Subsea Design Cost and Scheduling System
E.Rasten, Seanor Eng., Oslo; E.Lorentzen, Zentech Consultants; L.Bilstad, Statoil, Stavanger
Proceedings of SUBSEA '88, International Conf., London, December 1988.

Dynamic Analysis of Secondary SubSystems
R.Chandwani, D.Mahmood, Zentech Consultants; J.Colloff & D.Daintith, British Nuclear Fuels, Risley
U.K. Proceedings of Conference held at University Of Bristol, March 1988.

Flexible Riser Dynamics Modelled in 3-Dimensions
P.A.Brown, R.Chandwani, I.Larsen
Proceedings of International Conference on Offshore Structures, City University, London, Sept. 1987.

Precast Prestressed Section Under Axial and Bending
R.Chandwani, N.D.Nathan
Journal Of Prestressed Concrete Institute, USA, May/June 1971.