Download - Nafems CompoMethods and Technology for the Analysis of Composite Materialssiteswebinar 2007 All Inc
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Methods and Technology for theMethods and Technology for the Analysis of Composite Materials
September 24, 2007
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AgendaAgendaNAFEMS Methods and Technology for the NAFEMS Methods and Technology for the gygyAnalysis of Composite Materials WebinarAnalysis of Composite Materials Webinar
September 24, 2007September 24, 200711:00am ET (GMT 11:00am ET (GMT --04:00, New York)04:00, New York)
Welcome & Introduction (Overview of NAFEMS Activities)Welcome & Introduction (Overview of NAFEMS Activities)Matthew Ladzinski, NAFEMS North American Representative
Methods and Technology for the Analysis of CompositeMethods and Technology for the Analysis of Composite Materials
Dale Berry, SIMULIA
Failure Simulation of Z-pinned CompositesKyle Indermuehle, ATA Engineering
Q&A Session Panel
Cl i
www.nafems.orgwww.nafems.org
ClosingBerry Indermuehle
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THE INTERNATIONAL ASSOCIATIONTHE INTERNATIONAL ASSOCIATIONTHE INTERNATIONAL ASSOCIATIONTHE INTERNATIONAL ASSOCIATIONFOR THE ENGINEERING ANALYSIS FOR THE ENGINEERING ANALYSIS
COMMUNITYCOMMUNITY
An Overview of NAFEMS Activities
Matthew LadzinskiMatthew LadzinskiNAFEMSNAFEMSNorth American RepresentativeNorth American Representative
www.nafems.orgwww.nafems.org
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Planned Activities in North America
Work Session on the Management of Simulation Work Session on the Management of Simulation Data Data
Take Control of Your Analysis and Simulation DataTake Control of Your Analysis and Simulation Data September 27, 2007September 27, 2007 www.nafems.org/92707www.nafems.org/92707
W biW bi WebinarsWebinars New topic each month!New topic each month! MultiMulti--physics Simulation using Directly Coupledphysics Simulation using Directly Coupled--Field Element Field Element
T h lT h l O t b 18O t b 18thth t 2 ETt 2 ETTechnology Technology October 18October 18thth at 2pm ET.at 2pm ET. Recent webinars:Recent webinars: Simulation Process ManagementSimulation Process Management NWC07 PreviewNWC07 Preview NWC07 PreviewNWC07 Preview SimulationSimulation--supported Decision Makingsupported Decision Making Simulation Driven Design (SDD) FindingsSimulation Driven Design (SDD) Findings
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For the latest information, please refer to the NAFEMS website: For the latest information, please refer to the NAFEMS website: http://www.nafems.org/regional/north_americahttp://www.nafems.org/regional/north_america
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Methods and Technology for the Analysis of Composite Materials
Dale BerrySIMULIA
Copyright 2007 Dassault Systmes
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6Agenda
Industry trends
Recent development in Abaqus driven by the composites communityp q y p y
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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7Composites Usage is Increasing in All Industries
Aerospace Boeing 787 1st large jet with a majority of composites by weight
Airbus 350WX - Over 60% of airframe made of new materials
UAVs primarily composite construction
Automotive Automotive F1 racing composite shells
Pickup truck composite box
Civil Composite-wrapped
bridge structures
Dentistry Fiber-reinforced composite dental bridges
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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8Increased Usage of Composites Means More Users Which Results in More Software Development EffortsWhich Results in More Software Development Efforts
More customers using software results in more requests for features and enhancements related to compositesp
Using composites in new applications requires new methods and technology developed to simulate those applicationstechnology developed to simulate those applications
Majority of development efforts are in response to and with guidance from customersfrom customers
Industry requirements
Bug reports
Enhancement requests
User groups
Benchmarks / round robins
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
Benchmarks / round robins
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9Increase in Usage of Composites Corresponds to Expanded User BaseExpanded User Base
Composite analysis moving from the researcher level to the designer level requires:q
Enhanced usability features
Increased robustness
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Researchers
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Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials User sophistication
Analyst/Expert
EngineerDesigner
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Increase in Usage of Composites Requires Development of New Software TechnologyDevelopment of New Software Technology
Composites are increasingly being used for load-bearing, critical parts Requires more reliability and capability in the software for simulating Requires more reliability and capability in the software for simulating
failure modes of composites
Fracture and failure
D l i ti
from McCarthy, M.A., Harte, CG, Wiggenraad, J.F.M., Michielsen, A.L.P.J., Kohlgruber, D., and Kamoulakos, A., Finite Element
Modeling of Crash Response of Composite Aerospace Sub-floor Delamination
Crashworthiness
Fatigue
g p p pStructures, Computational Mechanics, 26(3), Sept. 2000
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Growth of Industry Drives Software DevelopmentIn Turn, Software Enables Industry GrowthIn Turn, Software Enables Industry Growth
Composites industry helps drive software developments More customers results in more requirements
L b i i i d bili Larger user base requires in increased usability
Increased usage requires greater reliability
New software developments enable growth of composites industryE f f t ll t t th t h l Ease of use features allow greater access to the technology
Increased capabilities provides greater confidence in simulation
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Software Usability Enables Greater Number of Users
Expanded access to composites simulation through CAD interface / environment for composites definition
Direct interfaces between CAD lay-up and FEA lay-ups for simulation
Easier definition of composite layups
Enhanced post processing of composites for easier understanding of Enhanced post-processing of composites for easier understanding of results
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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13Greater Confidence in Simulation Enables Increased use of Composites for Critical Componentsp p
New, advanced technology provides for greater confidence in results Ability to simulate the many failure mechanisms of composites allows
composites to be used for critical parts Testing still necessary for validation, but simulation critical for
designing components
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
Example of high speed impact damage
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Growth of Composites Industry and Increased Software Capabilities are CoupledIncreased Software Capabilities are Coupled
Broader use of composites requires advanced features
More users results in more requirements
Industry
SoftwareEnhanced usability results in more users
Advanced capabilities enables broader use of composites
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Trend Charts
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/CAE Composites
Reducing Costs in Aircraft, Martin and Evans, Journal JOM, 52 (3) (2000), pp. 24-28.
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eManager Ply-based post-
processing Thru-thickness
plots Cohesive
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plots Draping analysis Ply stack plots
elements Delamination
failure analysis Import of damage
t t (Std E )
VCCT analysis Continuum shells /CAE supports
lamina mat. props.
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
Abaqus versionv6.4 v6.5 v6.6 v6.7
state (Std. Exp.)p p
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Good Software Capabilities Have Been Created, But There is Still A Lot of Work to Be DoneThere is Still A Lot of Work to Be Done
Current simulation methodology is not up to the task Verification of composites relies on testing p g
Expensive, time consuming
Current methodology has not evolved since the 1980s
T i l i l ti li th d t ti t fi t f il Typical simulation uses linear methods to estimate first failure
Current composites interfaces are not up to the task It is very time consuming to define composites and post-process
composites in today's CAE tools
Some CAD/CAE/PLM packages do not support progressive failure, delamination, or material damage
With linear methods, design margins for composite parts today are often too high the part is too expensive and heavy as a result
This reduces the value of the use of composites and blunts the cost
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
padvantages that composites can provide to a product
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Agenda
Industry trends
Recent development in Abaqus driven by the composites communityp q y p y
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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End Result of Increased Composites Usage in Industry is a Composites Focus at SIMULIAIndustry is a Composites Focus at SIMULIA
SIMULIA Composites Mission StatementOur solution allows customers to:Our solution allows customers to:
Perform advanced composites simulations including static and dynamic analysis that includes linear, nonlinear, and damage / fracture /failure within a single environment
Predict the stiffness, first-failure, strength, and post-failure behavior at the component and full-vehicle structural scale of complex composite productsproducts
Simulate low- (from tool drop or hail), medium- (from runway debris), or high-velocity (ballistic penetration) events including Barely Visible Impact Damage (BVID) and Bird StrikeDamage (BVID) and Bird Strike
Have the very best in composite modeling, visualization, and post-processing through /CAE's new ply-based interfaces
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
p g g p y
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A Look at Abaqus Developments that Enable Composite Usage in IndustryComposite Usage in Industry
SIMULIA technology needs to:gy Provide a platform for evolving your composites simulation
methodology to deliver more accurate results to meet regulatory and competitive demands
Be built in cooperation with and with guidance from customers and composite industry groups
Builds upon the traditional deep FEA simulation foundation of ABAQUSBuilds upon the traditional deep FEA simulation foundation of ABAQUS
Increase your composite simulation efficiency by reducing the time needed to generate composites models
Be backed by a solid experienced team of application engineers that will Be backed by a solid experienced team of application engineers that will help speed deployment to maximize the value of your investment in ABAQUS simulation
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Abaqus Provides the Capability to Design Better Performing Composite ProductsBetter Performing Composite Products Technology Need:
Provide a platform for evolving composites simulation methodology to deliver more accurate results to meet regulatory and competitive demandsmore accurate results to meet regulatory and competitive demands
Meaning: To design better performing composite components, you need to change your
methodology Abaqus enables new analysis methodologymethodology. Abaqus enables new analysis methodology
New methodologies used by industry: VCCT for composite crack growth
B i H k d H il d Boeing, Hawker deHaviland Progressive failure analysis
NASA Glenn Research CenterM d lli Fib M t l L i t Modelling Fibre Metal Laminates
Airbus Deutschland, Advanced Lightweight Engineering
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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New Abaqus Developments are Focused-on and Driven-by Real Life Needsand Driven-by Real Life Needs
Technology Need : Be built in cooperation with and with guidance from customers and
composite industry groups
Meaning: Our new technologies are exactly what is needed to solve real problems, g y p ,
because it has been developed with cooperation with industry
Developments drive-by: Boeing VCCT collaborationBoeing VCCT collaboration
FAA Center of Excellence for Composite Materials
ASTM/D30, Composites Workshops and CMH-17
Fracture CRTFracture Customer Review Team
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Along with Composites, Abaqus is a Leader in General Purpose FEA SimulationGeneral Purpose FEA Simulation
Technology Need : Builds upon the traditional deep FEA simulation foundation of Abaqus
Meaning: We are not offering solely a composites solution. Abaqus is a complete,
market leading FEA toolkit.g
Abaqus is used throughout the following industries: Aerospace & defense
A hit t & t ti Architecture & construction
Automotive
Consumer goods
Industrial equipment
Life sciences
Process power & petroleum
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
Process, power, & petroleum
Shipbuilding
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New Composites Interface Reduces Time Spent Building Models Spent Building Models
Technology Need : Increases your composite simulation efficiency by reducing the time
needed to generate composites models
Meaning: The new ply-based modeling in /CAE saves a significant amount of time p y g g
in creating and understanding results for composite simulations
Time Savings: New interface reduces time spent creating composite models fromNew interface reduces time spent creating composite models from
multiple hours to less than one hour
New post-processing functionality dramatically reduces the amount of time yneed to interpret and understand results
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Realize Abaqus Benefits Quickly Through Support by Abaqus Application EngineersSupport by Abaqus Application Engineers
Technology Need : Be backed by a solid experienced team of application engineers that will
help speed deployment to maximize the value of your investment in Abaqus simulation
Meaning: Methods evolution can be scary, we can help you with the process
Abaqus provides a range of services to support deployment: Assessment of needsAssessment of needs
Delivery of introductory and advanced training
Development, documentation and deployment ofmethods and proceduresmethods and procedures
On-site mentoring
Development of process automation solutions
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
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Status Summary
Large-scale high-volume applications of composites is increasing Software developments to enable Realistic Simulation of composites
are appearing in COTS products This feeds even more industry applications...
Current demands driving the software community are: Increased efficiency in crack-propagation/damage simulation
C it f hi h l E M t li ti Composites for high-volume Energy Management applications
Fatigue lifecycle simulation
Repair modeling and residual life simulation
Accounting for the effects of aging
We will respond positively to these trends stay tuned!
Copyright 2007 Dassault SystmesMethods and Technology for the Analysis of Composite Materials
We will respond positively to these trends...stay tuned!
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F il Si l ti f Z i dFailure Simulation of Z-pinned Composites
Kyle C. IndermuehleATA Engineering
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Simulation of Z-Pinned Composites
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One weakness of composites is low resistance to delamination Only matrix provides strength in thru-thickness
Z-Pinning addresses this by adding Trans-Laminar Reinforcements (TLR) Z-pins are a discontinuous fibres that are added
in the thru-thickness direction Z-pinning results in dramatically improved
delamination capabilities
Challenge is to accurately represent z-pins in analytical simulations Currently, testing is relied upon
www.ata-e.com
(Image courtesy of Chang, et. al. [2])
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Agenda. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem statement Abaqus technology utilized Simulation results and conclusions
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Problem Statement: Predict the Load Carrying
Capability of DCB Coupon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Can the z-pins resist the growth of the initial crack? Speciman 9 long by 1 wide by 0.12 thick 24 zero degree (0) plys 1 initial crack 1 unreinforced composite 1 z-pinsp p
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Freels, Jason K., Modelling Fracture in Z-pinned Composite Co-Cured Laminates Using Smeared Properties and Cohesive Elements in DYNA3D, Air Force Institute of Technology, AFIT/GMS/ENY/06-S01, 2006.
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Agenda. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem statement Abaqus technology utilized Simulation results and conclusions
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .New Abaqus Technology Enables Advanced Simulation of Composites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ABAQUS recently released a VCCT capability for analyzing compositesfor analyzing composites Partnership with Boeing Commercial Aircraft
Group to implement VCCT into Abaqus products
B d Li El ti F t Based on Linear Elastic Fracture Mechanics (LEFM) concepts
Based on computing the energy release rates for normal and shear crack-tip deformation modes
Compare energy release rates to interlaminar fracture toughness
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VCCT-for-Abaqus Usage and Keywords. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abaqus approach is surface based Extension of DEBOND Automatic modeling of post failure contact
Delamination plane paved
*CONTACT PAIR, INTERACTION=FRACTURE, ADJUST=NsetbondSlave--Slave surface name
with surface based contact pair
Slave Slave surface name Master--Master surface name
*SURFACE INTERACTION, NAME=FRACTURE, UCRACK, DEPVAR=12, PROPERTIES=16,
www.ata-e.com
,G_IC,G_IIC,G_IIIC,mixType,m,n,ow,
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Surface Interaction Properties Define Fracture Mechanics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Properties (given on data line)
G_ICG_IIC = Fracture toughness, modes I, II, and IIIG_IIIC
= 1 for B-K (2D shown):mixType ( )
m
III
IICICIICIC GG
GGGG
++
= 2 for Power law:o
IIIC
III
n
IIC
II
m
IC
I
GG
GG
GG
+
+
eta = Coefficient for B-K law
m, n, o = Exponents for mode mixity formula
IIICIICIC
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w = Out-of-plane width for 2D analysis
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Advantages of Abaqus VCCT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Runs during an ABAQUS analysis Utilizes the existing debond contact
architecture in ABAQUS/Standard,suitably extended
Does not utilize overlapped userelements as the basis for theimplementation
Does not require matched meshesacross bonded surfaces
Includes post-failure ramp-down ofcrack tip force
Includes post-failure penetration prevention Includes post-processing capabilities within Abaqus/Viewer Includes analysis stabilization algorithms to help stabilize running cracks in
Abaqus/Standard Is compatible with existing Abaqus elements and material, incrementation and
convergence controls, and stress-based procedures
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Along with VCCT, Abaqus Also Recently Released Cohesive Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cohesive elements model progressive failure atCohesive elements model progressive failure at interfaces Adhesive joints with finite thickness
Constitutive modeling based on any ABAQUS g y Qmaterial
Enables failure modeling in ABAQUS/Explicit consistent with general framework
Delamination (adhesive layer of zero thickness) Delamination (adhesive layer of zero thickness) Based on a traction separation description for
delamination Enables failure modeling consistent with g
general framework
Damage initiation criteria Damage evolution criteria
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Delamination with Cohesive Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delamination applications Traction separation law
T i ll h t i d b k
TN
Typically characterized by peak strength (N) and fracture energy (GTC)
Mode dependent
TCG
Mode dependent Linear elasticity with damage
Available in both ABAQUS/Standard and ABAQUS/Explicit 7
Typical traction-separation response
Q / p Modeling of damage under the
general framework used for other material models in ABAQUS
Damage initiation 34
5
6
7
G
T
C
Normal mode
Shear mode
Damage initiation Traction or separation-
based criterion Damage evolution Removal of elements
0
1
2
0 0.2 0.4 0.6 0.8 1
M d Mi
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Removal of elements Mode MixDependence of fracture toughness on mode mix
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cohesive Elements in Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*element, type=coh2d4, elset=coh999999, 2005, 2105, 2106, 2006
*cohesive section, elset=coh, material=mat1, response=traction separation, controls=cont
*material, name=mat1*elastic, type=traction1.5e4, 1.5e4, 1.5e4
*damage initiation, criterion=maxe0 06 0 060.06, 0.06
*damage evolution, type=displacement, SOFTENING=EXPONENTIAL0.06, 0.06
*section controls, name=cont, element deletion=yes, max degradation=1.0
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Agenda. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem statement Abaqus technology utilized Simulation results and conclusions
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Proposed Method for Simulating Z-Pinned Composites Using Abaqus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Methodology Methodology Coupled VCCT and cohesive element
modelingC it f t t d i VCCT Composite fracture represented using VCCT
Based on GI, GII, GIII property definitions
Effect of Z-pins represented using cohesive elementselements
Cohesive element properties tuned based on test data
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Double Cantilever Beam (DCB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCCT defined along entire beamC h i l t d fi d l i i d Cohesive elements defined only in z-pinned region
region of cohesive elements
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VCCT *DEBOND surface
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VCCT Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .*CONTACT PAIR, INTERACTION=FRACT,ADJUST=BNODESBOT, TOP
*SURFACE INTERACTION, NAME=FRACT,ucrack, properties=11, depvar=131.0, ,,, ,,, ,,
** Fracture toughness:GIc = 1.425GIIc = 6.0GIIIc = 6.0
** B-K parameter:modeMixLaw=1eta=1.75
** mixed mode parameteram =0.001an=0.0ao=1.0
. . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cohesive Elements Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .*element, type=coh2d4, elset=coh999999, 2005, 2105, 2106, 2006
*elgen, elset=coh999999, 10, 100, 1,
*cohesive section, elset=coh, material=mat1, response=traction separation, thickness=specified, controls=cont1.0, 1.0
*material, name=mat1*elastic, type=traction1.5e4, 1.5e4, 1.5e4
*d i i i i i i*damage initiation, criterion=maxe0.06, 0.06
*damage evolution, type=displacement, SOFTENING=EXPONENTIAL0.06, 0.06
* i l l d l i*section controls, name=cont, element deletion=yes, max degradation=1.0
. . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (Without Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analysis and test compare fairly well Test peak is between 70 and 145 lbf (depending on rate) Analysis peak is 78 lbf Shape compares well
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (With Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analytical model VCCT properties remain same as previous model Added zero-thickness cohesive elements for z-pins
active zactive z--pinspins
Failed zFailed z--pinspins
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Failed zFailed z pinspins
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (With Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (With Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (With Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
www.ata-e.com
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DCB Simulation (With Z-Pins). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analysis and test compare fairly well Stiffness slope through z-pin area matches Peak load of ~75 lbf in test compared to 80 lbf in simulation at COD of
0.7 inches in both test and analysis
ABAQUS Test
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simulation of composites is still very challengingE i ll th f il d Especially the many failure modes
Accurate analysis of composites requires new y p qmethodologies and new FEA technologies
Simulation of z pinned reinforced composites was Simulation of z-pinned reinforced composites was presented using a combined VCCT and Cohesive element approach in Abaqus
DCB i i d DCB specimen examined Initial results show good comparison between test and analysis
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THE INTERNATIONAL ASSOCIATIONTHE INTERNATIONAL ASSOCIATIONFOR THE ENGINEERING ANALYSIS COMMUNITYFOR THE ENGINEERING ANALYSIS COMMUNITY
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