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PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
1 ProNet UPDATE - 9 - March 2018
Code_Aster Professional Network
aims to spread and to acknowledge the benefits of
Code_Aster and Salome-Meca
Nine issues since July 2015
New distributions
Trainings and meetings in the world
Industrial applications of Code_Aster
Code_Aster as a platform for PhDs
Jean-Raymond Lévesque Representative of Code_Aster ProNet
New members
Since 07/2017
ARGENTINA
FRANCE
RUSSIA
SPAIN
TUNISIA
MOROCCO
March 2018
86 members with
27 universities
Code_Aster Open source for sustainable development … join the network ProNet
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
2 ProNet UPDATE - 9 - March 2018
New distributions
CAE Linux is now built on top of Xubuntu 16.04 and the next release will ship with the most recent versions of Salome-Meca 2017, Code_Aster 13.4 (parallel version), Code_Saturne 5.0.4, Openfoam and HelyxOS GUI as well as Calculix and many more.
Contact - Joël CUGNONI www.caelinux.com
Code_Aster for Windows Code_Aster for windows is dedicated to Windows users, interested in using a free software for numerical simulation in structural mechanics. This famous open source software, officially provided for Linux environment only, was built from source to provide up-to-date native Windows 64-bit binaries, freely available. Code_Aster can be used graphically with the Windows version of Salome-Meca and AsterStudy module, also available in our download page, or as a stand-alone version.
Contact - Etienne CHEIGNON [email protected]
Webinars - Online courses - Blogs
Code_Aster online course
The course features 35 teaching hours to be completed in 8 weeks. At the end of the course an aptitude certificate will be issued to the students who pass the course. The students receive manuals in pdf format, video-tutorials and solved exercises. An online platform is available 24 hours/7 days a week.
NORPLAN ENGINEERING S.L. A Coruña – SPAIN
Contact [email protected]
Open source FEA: start now with SALOME MECA 2017 !
On his blog “FEA for All: From Basics to Advanced”, Cyprien RUSU publishes a large collection of works on FEA.
Contact
Cyprien RUSU
Tutoriel Code_Aster on LINUXFR.ORG (in French) Contact http:/ /linuxfr.org/news/38377
Other Code_Aster and Salome Meca videos on
FEA & CAD
Anisim Open Source Engineering Software
Digvijay Patankar
TRAINING
In 2018, several
organizations propose
training sessions
for Code_Aster and
Salome-Meca
www.phimeca.com/Formations
www.code-aster-services.org
www.cevaa.com
www.code-aster.de/services
www.vonstein-partner.de
www.scopeingenieria.com
TUTORIALS
The course materials used by EDF for internal teaching
are online and written directly in English.
New release 2017/12
http://code-aster.org/spip.php?rubrique68
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Training and Meetings in the world
China
From March 13th to 16th, EDF is organizing in Guangzhou a Code_Aster training open to all, jointly with the Sun Yat-Sen University and NSCC-GZ (National Super Computer Center Guangzhou).
The courses will be lectured by engineers from the EDF R&D center in China accompanied by a Code_Aster developer and a professor from Sun Yat-Sen University. It will cover both basic functionalities as well as some advanced functionalities in dynamics and fracture mechanics.
United Kingdom
Code_Aster Users' Day – 11th September 2018 – Manchester, UK
- Updates on Code_Aster and Salome-Meca, with AsterStudy. - Presentation of Code_Aster massively parallel, available soon - Presentations (6-8) Technical presentations - Discussion with Code_Aster developers and experts
Contact Philippe MARTINUZZI [email protected]
Tunisia
Thanks to the program “sustainable development in Maghreb with Code_Aster”, Salome Meca 2017 is now implemented in four engineering schools in Tunisia (ENIT – ENIM – ENSIT – ESPRIT) with the partnership of the Tunisian Association for Mechanics. After a seminar in January at ENI Tunis, a training session for 12 teachers will be organised in the end of March 2018 by PHIMECA Engineering.
Contact Pr. Abdelwaheb DOGUI [email protected]
Argentina
For a pressurized thermal shock analysis of the reactor pressure vessel of Atucha-I nuclear power plant, CIMEC performed a decoupled thermomechanical analysis in Code_Aster, and then programmed in python the routines for the calculation of the RTNDT (Reference Temperature for Nil Ductility Transition) using ASME methodology.
CIMEC also organized a presentation of the new version of Salome-Meca with AsterStudy (10 hours seminar) which was attended by 10 researchers and PhD students.
Contact Agustín Pecorari [email protected]
Morocco
For the program “sustainable development in Maghreb with Code_Aster”, a seminar was held at Moulay Ismaïl University – MEKNES in February. It launched the accompanying program in a dozen universities and engineering schools (OUJDA, TETOUAN, MEKNES, FEZ, RABAT, KENITRA, and CASABLANCA) under the partnership of committee of university presidents. Mickaël ABBAS from EDF R&D contributed to the event with technical presentations.
Contact Pr. Lahcen BOULMANE [email protected]
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Code_Aster as a platform for PhDs
Modelling of internal swelling reactions in concrete dams
Pierre MORENON, [email protected], [email protected]
Internal swelling reactions (ISR), which feature Alkali-Aggregate Reaction (AAR) and Delayed Ettringite Formation (DEF), damage the concrete of structures such as dams. Electricité De France (EDF) must ensure the safety of the people and goods located below the dam. This PhD work aimed to improve the modelling of the physical phenomena related to these damages, especially the interaction between the swelling product and the solid skeleton.
In order to reproduce all the physical phenomena that can lead to displacement and damage on structures, the model can reproduce separately or with combinations: multi-axial creep, shrinkage, structural and ISR damages.
The model originality is to separate the cracking at the microscopic scale (ISR damage that affects the material characteristics) and the cracking at the macroscopic level (opened cracks due to swelling gradients that can lead to structure failure).
The model has been validated on samples under multi-axial stresses and restraints, plain and reinforced beams submitted to moisture gradients in laboratory and two 1950s dams in real conditions.
The model results make it possible to reproduce the displacements, the stresses and the residual strength of these structures after aging. This model is a tool for the requalification of concrete structure in order to ensure their safety. It can also be a basis for the simulations of diverse rehabilitations and reinforcement works.
For further information, the PhD thesis manuscript can be found at http://thesesups.ups-tlse.fr/3603
A video of the full defence can be reached at https://youtu.be/cwn6lEONqk8.
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Code_Aster as a platform for PhDs
Three PhD thesis at Civil Engineering Department - TLEMCEN University
Contact - Mohammed MATALLAH [email protected]
Probabilistic method for evaluating the overall strength of metal bridges from deformation data - Aïcha BENMOKRANE
Static, dynamic and fatigue modelling of bridges under railway loadings (Eurocode 1 part 2) Probabilistic estimation of the resistance and reliability Parametric study of crack propagation at the critical riveted assembly level.
Identification of shear force transfer mechanisms in reinforced concrete elements under shear effects - Ahmed BELBACHIR
Modeling of the “dowel” effect induced by the longitudinal armature with nonlinear spring model
Seismic risk attenuation by shape memory alloy devices - Mohammed Ilyes BENKRALED
Implementation of a new behaviour relationship in Code_Aster: non-linear viscoelastic materials
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Code_Aster as a platform for PhDs
Non-intrusive coupling: multiscale computation and finite element mesh adaptation
Mickaël DUVAL et alii – Institut Clément Ader – Federal University Toulouse Midi - Pyrénées
We present an iterative coupling algorithm for solving multiscale problems, in a non-intrusive way. This work is a contribution to ANR Project ICARE with AIRBUS Group and EDF and four academic partners.
Let us consider a global linear finite element model on and a local (potentially non-linear) model on
ΩL .The purpose is to replace the linear model on the area of interest by the local model ΩL, without altering the numerical operator associated with the initial global model on Ω (for example the stiffness matrix K).
Starting from an initial solution U(0) the algorithm consists in a fixed point which tends to provide reaction equilibrium between the global and the local models at the interface, while verifying mechanical equilibrium over Ω and ΩL respectively.
Non matching meshes at the interface are handled by enforcing displacement continuity in a weak sense (using a mortar method), allowing for a flexible multiscale and/or multi model coupling.
Finally, such algorithm is applied to automatic mesh adaptation, in a non-intrusive way, i.e. allowing for refinement with patches acting as a replacement of the initial mesh on localized areas.
An a posteriori error estimation procedure is used to ensure the proper placement of the mesh refined patch. We rely on explicit residual error estimates which are very cheap to compute, while providing relatively good elementary error distribution.
The main property of such algorithm is its non-intrusiveness, i.e. the fact that the initial global mesh remains unaffected. Moreover, the algorithm depicted at Fig. 1 can be optimized using Quasi-Newton acceleration. Then, only a few iterations are required in order to reach equilibrium (cf. Fig. 2).
Then, the error on the non-intrusive composite (multiscale) solution itself is also to be assessed in order to guarantee the reliability of the method.
The classical explicit residual formulation has to be adapted due to the non-conforming (nested) interface at the patch edge, using the properties of Scott-Zhang interpolation operator to assess the interpolation error. Such method allows to easily sew different mesh types (triangle/quadrangle) and orders (h-p refinement).
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Code_Aster as an industrial R&D platform
Thermo-mechanical and numerical modeling of the behavior of hollow clay brick masonry under severe mechanical and thermal loads
AHMED SRIDI, HACHMI BEN DHIA, MSSMAT, ECOLE CENTRALE SUPÉLEC
One of the major challenges of the hollow clay brick industry nowadays is to improve the fire resistance of new products, while considering also insulation properties of these products. As a matter of fact, building regulations in Europe require that in the event of an inside-fire, masonry walls should provide an adequate barrier to fire during at least a legal prescribed time to allow the evacuation of the building. These constraints generate new technical challenges that cannot be solved only by carrying out experiments.
Therefore, analyzing of the behavior of hollow brick masonry, by means of efficient modeling and numerical simulations, is essential to define reliable processes that could help designing new products.
Challenges related to modeling
Multiphysics problem (thermo-mechanical coupling)
Different spatial scales (ranging from ~m for the wall to ~mm for the brick’s partitions)
Nonlinearities (characteristics of the material vary depending on the temperature)
Appropriate models
Computational cost for efficient design
To reduce costs, we assumed weak coupling between the two physics: the thermal problem is solved independently from the mechanical one. The former is first solved. Then, the mechanical problem is formulated
in the Arlequin framework under mechanical and thermal loads and appropriately solved.
Thermal problem
During the heat transfer in a hollow brick, different transfer modes come into play. To handle the radiation inside the brick’s cavities, SYRTHES, EDF's simulation tool for thermal transients is used. Numerical results are validated by comparison with experimental measurements. Isovalues of the temperature are given at two different times (t=15 and 30 min).
Reduced Arlequin modeling of the thermo-mechanical problem
For efficient design, the multi-model and multi-scale Arlequin framework is used. The brick is seen as an assembly of thin plate structures coupled to 3D solids; the latter being used in the local hot zones.
A 3D-plate coupling is implemented in Code_Aster and used to calculate hollow clay brick structures. Results are compared to 3D ones. Iso-values of stress fields are shown at t=30 min for both models.
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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Figure 1 Program flowchart
Code_Aster as an industrial R&D platform
Use of Code_Aster as FE-Module in FEM-MBS-Coupling
Tobias VONSTEIN, Ingenieurbüro Vonstein & Partner [email protected] www.vonstein-partner.de
In a cooperative project between Fachhochschule Südwestfalen, Ingenieurbüro Vonstein & Partner and Technische Universität Dresden, an integrated simulation environment for elastic multibody simulation (EMBS) is developed. The project is part of a PHD thesis.
EMBS is usually realised with a FEM-MBS-Coupling in industrial applications. For this purpose, a FE-Software is sequentially coupled to a MKS-Software. Usually one problem is that the individual modules are not sufficiently coordinated with each other. Additional the sequential coupling prevents an efficient simultaneous approach.
In the novel software, all modules are implemented in a simultaneous environment. New functions are being developed to improve FEM-MKS coupling. Code_Aster is embedded as FE-Module, SALOME is used for Pre- and Post-processing. In this way, existing functions are used, new functions can be implemented easily. Figure 1 shows the structure of the simulation environment.
A novel approach for interface modeling is currently being developed and implemented. In the FEM-MBS-Coupling, the connection of the joints in the MKS, with the contact surfaces in the FE model is called “Interface Modeling”. Figure 2 shows this with the example of a bearing lug. The common approach for this application is to use a rigid coupling (kinematical coupling).
The stiffness of the bearing is then modeled with a discrete spring (6 dofs, 0D element) in the MKS; see Figure 2 (right). Studies with testing models have shown that this approach causes a poor approximation quality in many cases. A significantly better approximation quality is achieved when the bearing stiffness is modeled between the joint and the contact surface with an elastic coupling in the FE-Model; see Figure 2 (middle). But therefore the 6x6 stiffness matrix must be modelled between the joint and the contact surface; see Figure 2 (left to middle). According to the current state, there is no FE formulation for this task in Code_Aster or elsewhere
.
Figure 2 Interface Modelling (Left: Real model, middle: Novel approach, right: Common approach)
To realize this novel approach a stiffness-matrix was developed and implemented in Code_Aster; see Figure 1,
red box. Discrete elements (DIS_TR) are used to define the single stiffness matrices of each spring in the coupling
and include them in the FE model with AFFE_CARA_ELEM. The new approach for interface modeling is currently
being verified and validated. Further results will be presented shortly. Feel free to contact us if you have any
questions.
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
9 ProNet UPDATE - 9 - March 2018
Code_Aster for industrial applications
Evaluation of fillet welds attachments used for hangers at tied arch steel bridges
Jacques BERTHELLEMY, CEREMA - Senlis, 29-30 Nov. 2017
Fatigue cracks appear most frequently
1/ at weld root - very difficult to detect before it reaches the surface by propagation
2/ at weld toe - propagation of a crack at weld toe is easier to detect
Permanent stresses are for a large part residual welding stresses.
They have no influence on crack initiation. Tensions accelerate propagation.
Usual features before 2011 and the Eurocodes Bridge at Saint-Gilles
Avoided Preferable Acceptable
Today : Eurocodes EN 1993 – 1 – 9 rules
If filled welds can be considered, the new norm tells that the evaluation of the stress distribution is crucial in fatigue and that FEA calculation should be used. So that the justification of fillet welds attachments with the Eurocodes is not easy either.
The calculation technique procedure was tested by CEREMA - Sétra during the RFCS Precobeam european
research program and was proved in accordance with Eurocode’s experimentally established fatigue classes.
A nominal stress multiplied by an appropriate stress intensification factor kr to allow for a geometric discontinuity
that has not been taken into account in the classification of a particular constructional detail. In this case, an
appropriate FEA analysis is necessary.
PRONET Update - 9 QUARTERLY REPORT OF CODE_ASTER PROFESSIONAL NETWORK
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