real world nonlinear mechanical applications
DESCRIPTION
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 responseTRANSCRIPT
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Real World
Nonlinear Mechanical Applications
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This webinar will be available afterwards at
designworldonline.com & email
Q&A at the end of the presentation
Hashtag for this webinar: #DWwebinar
Before We Start
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Moderator
Laura Carrabine Design World
David Kan COMSOL
Presenters
Srinivas Reddy MSC Software
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Real World Nonlinear Mechanical
Applications
Srinivas Reddy
February 29, 2012
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Product Development Challenges
Can I build it? Is it durable? Is it crashworthy? Is it safe?
Can I test it? Will it perform to spec? Will it fail? Why did it fail?
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CAE to Improve Product Performance
Pipe impact
Sports equipment
Bolt Loading
Shearing/Tearing
Seal analysis
Brake disk
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CAE to Optimize Manufacturing Processes
Superplastic Forming Glass Forming
Forming Riveting
Cutting
Extrusion
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Nature is Nonlinear
F
u Displacement
Load
Nonlinear Behavior
Linear Behavior
u
F
s
e Strain
Nonlinear Behavior
Linear Behavior Stress
Yield Pt. F F
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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
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Challenges of Nonlinear Analysis
• Material modeling
• Large deformation,
distortions and rotations
• Contact
• Performance
• Robustness
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Material Modeling
• Metals
• Plastics
• Rubbers
• Shape memory alloys
• Composites
• Glass
• Concrete
• Powder materials
• Other non-metallic materials
• Customizable behavior
Aluminum Can Pull Tab
Plastic Bottle
Rubber Tire with Metal Rims
Composite Materials
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Material Failure
• Metals o Ductile damage
• Elastomers o Material weakening
• Composites o Delamination
• Crack propagation
• Concrete o Brittle failure, crushing
Delamination
Crack Propagation Fatigue crack growth
Gear failure
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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
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Contact
• General large sliding
contact with friction
• Intuitive and easy set up
• Automatic contact
detection
• Remeshing
• Multi-physics
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Performance
• Efficient solvers
• Parallel processing
o Excellent scaling
o Shared and distributed memory
• Domain decomposition method
o Linear scaling
o Benefit from networked desktop systems
o Solver large models
• Better use of hardware
o GPU
~75k Degrees of Freedom
MPI MPI MPI
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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
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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
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Summary
• Nonlinear analysis challenges o Materials,
o Large deformations and distortions
o Contact and boundary conditions
o Coupling
• Technologies o Materials models,
o Contact modeling ease
o Physics simulation
o Automatic remeshing
o Performance
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Nonlinear Mechanics in COMSOL A Multiphysics Perspective
David Kan
COMSOL, Inc.
February 29, 2012
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The Multiphysics Approach
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Structural Mechanics Branch
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Geometry
Materials
Contact
Sources of Mechanical Nonlinearity
st
s
e
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Geometric Nonlinearity
Small displacement
theory Green-Lagrange strains
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Nonlinear Constitutive Laws
Hyperelastic constitutive law • Rubber
• Biological tissues
s
e
Elasto-plastic constitutive law • Metals
• Plastics
• Soils and concrete in compression
s
e
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Hyperelastic Materials
Hyperelastic constitutive laws are defined
by the strain energy density, Ws • Neo-Hookean
• Mooney-Rivlin
• Murnaghan
s
e
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Elasto-plastic Materials
s
e el
sy
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
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Contact
Source
Destination
How about
Multiphysics?
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The Metelli Experience
Hyperelastic material law
Nonlinear geometry
Contact everywhere
Multiphysics
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Multiphysics and Mechanics
• Creep
• Predefined couplings o Piezoelectric effects
o Acoustic-Structure Interaction
o Thermal-Electric-Structural Interaction
o Fluid-Structure Interaction
o Thermal-Structural Interaction
• General couplings
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Thank You!
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Questions?
Design World Laura Carrabine [email protected] Phone: 440.234.4531 Twitter: @wtwh_laurac
COMSOL David Kan [email protected] Phone: 310.441.4800 Twitter: @COMSOL_Inc
MSC Software Srinivas Reddy [email protected] Phone: 847.776.6740
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Thank You
This webinar will be available at designworldonline.com & email
Tweet with hashtag #DWwebinar
Connect with
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LinkedIn: Design World Group
YouTube: youtube.com/designworldvideo
Discuss this on EngineeringExchange.com
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