evolving composites simulation requirements and solutions
DESCRIPTION
Evolving Composites Simulation Requirements and Solutions. John Klintworth MSC.Software Ltd. Industry Trends. Lower Carbon Fibre Costs Sheet Material Replacing Random Fibres Heavier Sheet Reinforcement Weights Fewer Plies for Required Performance New Markets, e.g. Automotive, Energy BUT: - PowerPoint PPT PresentationTRANSCRIPT
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John KlintworthMSC.Software Ltd.
Evolving Composites Simulation Requirements and Solutions
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Industry Trends
• Lower Carbon Fibre Costs• Sheet Material Replacing Random Fibres• Heavier Sheet Reinforcement Weights
– Fewer Plies for Required Performance• New Markets, e.g. Automotive, Energy
BUT: • Manufacturing Difficulties
– Need more manufacturing simulation• Less Redundant Material
– Need more structural simulation
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Development Process
Aero. Shape Zone Layup Ply Layup Ply Details Certification
Simulate Simulate Simulate Simulate
Manufacture
OK!
feedback loop ...
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Aerospace
• Wheel cover• >100 Plies modelled in
CAD• Transferred to CAE
automatically• Benefits:
– Correlation between CAD and CAE
– Verification and failure tools in CAE
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Motorsport
• Monocoque• > 1000 Plies, > 100K
elements• Quick turnaround• Benefits:
– Rapid modification– Manufacturing link– Failure analysis– Crash model
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Automotive
• Floorpan• Cheap, heavy fabrics• Manufacturing critical• Benefits:
– Predict producibility rapidly
– Account for stiffness and strength of sheared material
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Marine
• America’s Cup Yacht• High performance• Variable loading• Benefits:
– Ply based model– Automated generation– Failure analysis– Manufacturing link
Stress Contours under Upwind Loads
By courtesy of
Team NZ & Matrix Applied Computing Ltd.
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Energy
• Wind Turbine Blade• Up to 40 m long• Lowest cost• Local buckling, flutter• Benefits:
– Modify materials easily– Multiple analysis codes– Manufacturing data
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Leisure
• Helmet• Fabric reinforcement• Sandwich construction• Must reduce cost• Benefits:
– Simulate manufacture– Account for shear-induced
thickening
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Simulation Drivers
• Each industry has different structural requirements
• These affect the degree of modelling and simulation used
Aerospace Motorsport Automotive Energy Marine LeisureCost 1 1 1 1 2Performance 2Reliability 2Speed (of dev.) 1 2 2 2 1
Key Structural Requirements in Different Industries
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Modelling
Aerospace Motorsport Automotive Energy Marine LeisureZone y yPly y y y y y y
Use of Modelling Techniques in Different Industries
• Ply modelling used throughout industries– Rapid modification– Link to manufacture
• Zone modelling used for preliminary sizing
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Manufacturing Simulation
• Draping is now used universally• Forming only useful for extreme cases• Resin flow simulation in marine market• Curing limited to aerospace
Aerospace Motorsport Automotive Energy Marine LeisureDraping y y y y y yForming y yResin Flow y yCuring y
Use of Manufacturing Simulation in Different Industries
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Structural Simulation
• Linear and failure analyses routine• Crash analyses emerging for motorsport,
automotive• Durability needed but unresolved
Aerospace Motorsport Automotive Energy Marine LeisureStatics/Dynamics y y y y y yFailure Analysis y y y y y yCrash y yDurability y
Use of Structural Simulation in Different Industries
x
ab
Failure Surface in Stress Space
M.o.S = (a-b)/by
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Optimization
• Topology optimisation under research• Parametric techniques established for
multidisciplinary optimisation• System optimisation growing
Aerospace Motorsport Automotive Energy Marine LeisureTopologyParametric y ySystem y
Use of Optimization Techniques in Different Industries
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Evolving Requirements
• Larger Models• Better Verification• Automated Data Transfer• Mirroring/Rotation• Solid Analysis• Nonlinear Analysis• Crash & Crush Analysis• Quicker Sizing• Account for Material Shear
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Larger Models
• Requirements– 200000 elements– 2000 plies– 20000 PCOMPS– 200 loadcases
• Solutions– Remove bottlenecks– 2-1000 x faster
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Better Verification
• Requirements– Audit model
• Solutions– Show Layup
• Element• Cross Section
– Show Laminate
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Automated Data Transfer
• Requirements– Speed up ply import– Import and export
laminates– Export flow model
• Solution– CAD Ply import 1000x
faster– LAP interface– RTM-Worx interface
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LAP interface
• Import materials and laminates during zone definition
• Export materials, laminates and loads during certification
Aero. Shape Zone Layup Ply Layup Ply Details Certification Manufacture
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RTM-Worx interface
• Export materials, plies and layup
• Both warp and weft directions considered
• Simulate resin flow for RTM
• Curing analysis
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ESAComp interface
• Import materials and laminates during zone definition
• Export materials, laminates and loads during certification
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Mirroring/Rotation
• Requirement– Reduce
modelling time for symmetrical structures
• Solution:– Transform Layup
Mirror
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Account for Material Shear
• Requirements– Account for shear
• Solution– Reference sheared
material properties
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• Requirements– Solid model for
thermal analysis• Solution
– Extrude solids– Calculate equivalent
material– Create coordinate
frames
Solid Analysis
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Nonlinear Analysis
• Requirements– Support MSC.Marc
• Solution– Update preference
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Crash & Crush Analysis
• Requirements– Support MSC.Dytran, LS-DYNA, Pamcrash
• Solution– Update preferences
Element Failure Time
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Quicker Sizing
• Requirements– Smeared Laminate– Discrete variables
• Solution– In MSC.Nastran 2001
LAM option New 2001 Membrane Bending Coupling Ply results Comments[A] [B] [D]
BLANK Y Y Y Y Default.SYM Y Y YMEM Y Y Y Wing skins.BEND Y Y YSMEAR Y Y Y Smeared.SMCORE Y Y (core N) Y Smeared with core.
Design Variables
0.00E+00
2.00E-01
4.00E-01
6.00E-01
8.00E-01
1.00E+00
1.20E+00
0 5 10 15 20 25 30 35 40 45 50
Design Cycle
Thic
knes
s
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Conclusions
• Simulation drivers vary widely across industries
• Ply modeling and kinematic draping are now universally accepted
• Resin flow and curing simulation show potential
• Crash and durability analysis developing rapidly
• Formal optimisation methods promise improved sizing