marouf dwaikat 4 lohr seam sim
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LOHR Industrie Seam Sim projectD. Turlier, Project managerP. Klein, Technical support
M. De Azevedo, V&V
A. Wilhelm,Automation
J anuary 2010LOHR 2010 www.lohr.fr
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LOHR 2010 www.lohr.fr 1
NX Open What is it?
Collection of Application Programming Interface (API) toolkits
that allow for the flexible integration of custom softwareapplications with NX through an open architecture.
Common API
Backbone of NX Open Object oriented
Supports multiple languages
and platforms
C++, Java, VB, C#
Provides access to the NX
Data Model
Supported by command
record and replay
A Journal captures this API
Endorsed & active across NX
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1. Seam Sim Project Presentation
2. Seam weld LOHR shell element model
3. CAD-CAE process and automation
LOHR Industrie Seam Sim project
Contents
LOHR 2010 www.lohr.fr 2
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LOHR 2010 www.lohr.fr 3
LOHR Industrie Seam Sim project
4 fields of Competence
Logistics-defenceRail-RoadPublic TransportationCar-carriers
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LOHR 2010 www.lohr.fr 3
LOHR Industrie Seam Sim project
Process Cost Parameters
Number of welds
Weld length/throat size
One side/Opposite sides welding
Intermittent/Continuous seam
Partial/Complete penetration
Seam Weld structural
assessment is crucial
(static, fatigue)
Seam Weld FEA
no commercial solution for a
global structure analysis
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1. Seam Sim Project Presentation
2. Seam weld LOHR shell element model
3. CAD-CAE process and automation
LOHR Industrie Seam Sim project
Contents
LOHR 2010 www.lohr.fr 5
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Seam Sim project
Seam Sim weld shell element model
Global structure FEA uses shell elements
LOHR 2010 www.lohr.fr 6
The mid surfaces of the solid sheets are created using
Midsurface feature NX tool ( offset method )
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Seam Sim project
Seam Sim weld shell element model
Equivalent stress through the weld throat
LOHR 2010 www.lohr.fr 7
Element centroid or Element node at the mid-height of the
weld throat
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Seam Sim project
Seam Sim weld shell element model
Through metal sheet crack fatigue analysis
Grid Point Force approach
Like in nCodeTM or VerityTM solutions
Structural stress is calculated through the plate thickness
using nodal forces and moments
LOHR 2010 www.lohr.fr 8
Nodes at the weld leg locations
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Seam Sim project
Seam Sim weld shell element model
Through throat crack fatigue analysis
Fricke approach for root cracking in fillet weld subject to
throat bending : linearized structural stress is calculated
through the throat thickness in the weld leg plane, IIWpublication.
LOHR 2010 www.lohr.fr 9
Nodes at the weld leg section locations
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Seam Sim project
Seam Sim weld shell element model
In complex structure, the load path
depends on the assembly rigidity
The weld shell element will have the same section area than
the real weld seam.
Correct stiffness for both longitudinal direction and
transverse direction
a
LOHR 2010 www.lohr.fr 10
Weld element thickness = Throat effective thickness (a)
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Seam Sim project
Seam Sim weld shell element model
The idea is to connect the weld element to
the metal sheets using NX 1D edge to
face connector
LOHR 2010 www.lohr.fr 11
RBE rigid body element for node projection(rigid kinematic connection, NX NASTRAN RBE2 element)
MPC multi-point constraint, the projected node is linked withno additional rigidity to the metal sheet element.(NX NASTRAN RBE3 element)
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Seam Sim project
Seam Sim weld shell element model
Same technique for other weld joints
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Seam Sim project
Seam Sim weld shell element model
Verification
Hexa20 541739 dof Quad8 1025 dof
Deflexion discrepancy
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Seam Sim project
Seam Sim weld shell element model
LOHR 2010 www.lohr.fr 14
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Seam Sim project
Seam Sim weld shell element model
LOHR 2010 www.lohr.fr 15
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Seam Sim project
Seam Sim weld shell element model
LOHR 2010 www.lohr.fr 16
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1. Seam Sim Project Presentation
2. Seam weld LOHR shell element model
3. CAD-CAE process and automation
LOHR Industrie Seam Sim project
Contents
LOHR 2010 www.lohr.fr 17
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FEM meshing
FEM connectors
SIM Boundary Conditions SIM Load Solving Post
Seam Sim project
Seam Sim automation
NX CAD
NX CAE
IdealizeSynchronisationAttribute mapping
Face to face
Connector
Weld section
Parameters
Geometryimport
CADModeling
Weld Assistant
Weld as solid
Fillet, butt, spot welds
Sealing , gluing
LOHR 2010 www.lohr.fr
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FEM meshing
FEM connectors
Seam Sim project
Seam Sim automation
Idealize
LOHR Toolboxes
C++ programs
NXOpen API
Block stylerCAD
Modeling
Weld Assistant
- Imprint
- Attribute
Idealize Update
CAD Connector
FEM connectors
SIM Boundary Conditions SIM Load Solving Post
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Seam Sim project
Seam Sim automation
1. first face set(multiple selection)
NX Weld Assistant
Weld as solid body
3. seam cross sectionparameters, ANSI, DIN,ISO, J IS weld standarts
2. second face set
(multiple selection)
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Seam Sim project
Seam Sim automation
The C++ program
1. CAD connection recipe object(face selection from weld feature)
2.makes the imprints of weld legs
3.attributes are assigned to the imprinted faces
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Seam Sim project
Seam Sim automation
The C++ program
1.makes the imprints of the mid surfaces
2.connection attributes are transferred tothe mid-surfaces
NX Idealization: metal sheetsand weld solids are idealizedto mid-surfaces
LOHR 2010 www.lohr.fr 22
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Seam Sim project
Seam Sim automation
The C++ program
makes 1D edge to face connections
NX Advanced simulation fem
- geometry synchronization ,attribute mapping
- manual 2D meshing
LOHR 2010 www.lohr.fr 23
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Seam Sim project
Seam Sim automation
CAD modification (weld update)
1 - Plate parameters
2 - Weld size
3 - Move object
4 - Move face
CAE Advanced simulation
Fem update
no manual operation
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Seam Sim project
Seam Sim automation
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Seam Sim project
Coming events
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Thank you for your attention
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