Until recently, most finite element analysis (FEA) applications undertaken by design engineers were limited to linear analysis which provides an acceptable approximation of real-life characteristics for most problems. However, occasionally more challenging problems arise that call for a nonlinear approach.
In this webinar, you will hear about real-world nonlinear applications and case studies associated with Comsol’s and MSC Software’s customers.
Viewers of this webinar will learn:
– How nonlinearities in engineering systems arise from several sources including:
– Material properties including multi-physics behavior
– Geometry variations that involve large deformations and strains
– Boundary conditions that could be continuously changing affecting the response
2. Before We Start
This webinar will be available afterwards at
designworldonline.com & email
Q&A at the end of the presentation
Hashtag for this webinar: #DWwebinar
5. Product Development Challenges
Can I build it?
Can I test it?
Is it durable?
Will it perform to spec?
Is it crashworthy?
Will it fail?
Is it safe?
Why did it fail?
6. CAE to Improve Product Performance
Sports equipment
Brake disk
Shearing/Tearing
Seal analysis
Bolt Loading
Pipe impact
9. Sources of Nonlinearities
• Materials
o Metals, plastics, elastomers, powder metals,
shape memory
• Deformation
o Buckling, folding
• Boundary conditions and loads
o Contact, loads changing with deformation
• Multi-physics
o Temperature effects, electromagnetics
10. Challenges of Nonlinear Analysis
• Material modeling
• Large deformation,
distortions and rotations
• Contact
• Performance
• Robustness
12. Material Failure
• Metals
o Ductile damage
• Elastomers
o Material weakening
• Composites
Crack Propagation
Fatigue crack growth
o Delamination
• Crack propagation
• Concrete
o Brittle failure, crushing
Gear failure
Delamination
13. Extreme Deformations
• Element formulations
• Appropriate stress/strain
measures
• Automatic local remeshing
o Mesh refining in high stress/strain
regions
• Automatic global remeshing
o Recreate a new mesh for the
entire part
14. Contact
• General large sliding
contact with friction
• Intuitive and easy set up
• Automatic contact
detection
• Remeshing
• Multi-physics
15. Performance
• Efficient solvers
• Parallel processing
o Excellent scaling
o Shared and distributed memory
~75k Degrees of Freedom
• Domain decomposition method
o Linear scaling
o Benefit from networked desktop systems
o Solver large models
• Better use of hardware
o GPU
MPI
MPI
MPI
16. Case Study: Column Shifter Boot
•
•
•
•
Business:
Automotive supplier
Challenge:
Accelerate the boot development to
satisfy the requirements of OEMs by
evaluating more design variants in less
time
Solution:
Design variants are studied with Marc to
predict the tear areas. For some design
variants the analysis results are verified
with tests
Value:
A boot design that meets the OEMs
requirement was found in less time at
less cost
17
17. Case Study
• Business:
Leading producer of aluminum for
engineered products
•
Challenge:
Avoiding tensile & compressive instability
in formed parts
•
Solution:
Iterative Blank Design using Inverse
Method with Marc
•
Value:
Accurate & efficient prediction of proper
designs for forming operation in less
time
18
18. Summary
• Nonlinear analysis challenges
o
o
o
o
Materials,
Large deformations and distortions
Contact and boundary conditions
Coupling
• Technologies
o
o
o
o
o
Materials models,
Contact modeling ease
Physics simulation
Automatic remeshing
Performance
19. Nonlinear Mechanics in COMSOL
A Multiphysics Perspective
David Kan
COMSOL, Inc.
February 29, 2012
26. Elasto-plastic Materials
Elasto-plastic materials are defined by two mechanical
behaviors: elastic and plastic
Nonlinear constitutive laws are defined above the yield
stress
In the plastic regime, there are irreversible strains
s
sy
el
e
29. Multiphysics and Mechanics
• Creep
• Predefined couplings
o
o
o
o
o
Piezoelectric effects
Acoustic-Structure Interaction
Thermal-Electric-Structural Interaction
Fluid-Structure Interaction
Thermal-Structural Interaction
• General couplings
32. Thank You
This webinar will be available at designworldonline.com & email
Tweet with hashtag #DWwebinar
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LinkedIn: Design World Group
YouTube: youtube.com/designworldvideo
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