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INNOVATION & TRAINING
DAYS:NUMERICAL SIMULATIONS
September 19 th and 20 th, 2019
Benjamin Redon / Technical department
1. WHAT IS A NUMERICAL SIMULATION?
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS 2
A. Terminology
FEM/FEA = Finite Element Method / Finite Element Analysis
Element = basic unit, deformable, compressible or not, part of a mesh representing a part to be
modelled; computation runs on these elements and on the bonding points between them
Characterisation = set of tests aimed at determining the behaviour of a particular material
1. WHAT IS A NUMERICAL SIMULATION?
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS 3
A. Terminology
FEM/FEA = Finite Element Method / Finite Element Analysis
Element = basic unit, deformable, compressible or not, part of a mesh representing a part to be
modelled; computation runs on these elements and on the bonding points between them
Characterisation = set of tests aimed at determining the behaviour of a particular material
1. WHAT IS A NUMERICAL SIMULATION?
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS 4
A. Terminology
FEM/FEA = Finite Element Method / Finite Element Analysis
Element = basic unit, deformable, compressible or not, part of a mesh representing a part to be
modelled; computation runs on these elements and on the bonding points between them
Characterisation = set of tests aimed at determining the behaviour of a particular material
Numerous available softwares : Ansys suite (Ansys), Abaqus/Simulia suite (Dassault Systems),
Code_Aster (EDF, french electricity company)…
1. WHAT IS A NUMERICAL SIMULATION?
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS 5
1. WHAT IS A NUMERICAL SIMULATION?
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B. Function principle
Modelling of the parts’ geometry (2D or 3D) with Abaqus
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
1. WHAT IS A NUMERICAL SIMULATION?
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B. Function principle
Modelling of the parts’ geometry (2D or 3D) with Abaqus
Meshing of the parts (coarse=speed, fine=precision)
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
1. WHAT IS A NUMERICAL SIMULATION?
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B. Function principle
Modelling of the parts’ geometry (2D or 3D) with Abaqus
Meshing of the parts (coarse=speed, fine=precision)
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
1. WHAT IS A NUMERICAL SIMULATION?
9
B. Function principle
Modelling of the parts’ geometry (2D or 3D) with Abaqus
Meshing of the parts (coarse=speed, fine=precision)
Processing of the loaded meshed parts (definition of interactions and state changes)
2D ≈ 30 s to 1 min
3D ≈ 30 min to 5 h
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
1. WHAT IS A NUMERICAL SIMULATION?
10
B. Function principle
Modelling of the parts’ geometry (2D or 3D) with Abaqus
Meshing of the parts (coarse=speed, fine=precision)
Processing of the loaded meshed parts (definition of interactions and state changes)
2D ≈ 30 s to 1 min
3D ≈ 30 min to 5 h
Analysis of the results
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
1. WHAT IS A NUMERICAL SIMULATION?
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C. Why perform a numerical simulation?
Compare/optimise solutions for decision-making
Understand physical phenomena that occur when an assembly is functioning
Get rid of long and complex mechanical tests
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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Analysis of a simulation based on several characteristics depending on which goal we are
willing to achieve.
To design a sealing function, classical trio:
A. Forces
B. Stresses
C. Deformations
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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A. Forces
Friction, assembly force
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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A. Forces
Friction, assembly force
Closing force (seal compression)
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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A. Forces
Friction, assembly force
Closing force (seal compression)
Reaction force during pressurisation phase
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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B. Stresses
Seal’s internal stress
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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B. Stresses
Seal’s internal stress
Contact pressure
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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C. Deformations
Compression / extrusion
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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C. Deformations
Compression / extrusion
Movements of the seal’s outline
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
2. WHAT ARE THE OBSERVABLE CHARACTERISTICS?
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C. Deformations
Compression / extrusion
Movements of the seal’s outline
Leak paths creation (local contact loss)
Areas of high deformation
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
3. LIMITATIONS & EVOLUTIONS
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Material characterisation in external lab are time-consuming and costly
No thermal analysis
No time-dependence / viscosity
3D modelling is limiting/limited
It is essential to define from the start what the needs are and what characteristics are
important
INNOVATION & TRAINING DAYS – NUMERICAL SIMULATIONS
4. CONTACT
JOURNÉES DE LA FORMATION ET DE L'INNOVATION – SIMULATIONS NUMÉRIQUES 22
If you have any further questions regarding this presentation, do not hesitate to contact me:
Benjamin Redon, technical department : [email protected] or +33 (0)4 72 54 11 50
