multi-scale characterisation and modelling of tufted
TRANSCRIPT
Multi-Scale Characterisation and Modelling of Tufted Composite
StructuresCamilla Osmiani
www.bris.ac.uk/composites
I. K. Partridge, G. Mohamed, G. Allegria, R. Backhouseb
aImperial College LondonbRolls Royce plc.
2/10Outline
Multi-Scale Characterisation and Modelling of Tufted Composites
1. Scope and Objectives
2. Micro-Scale Modelling
3. Meso-Scale Modelling
4. Future Work
5. Acknowledgments
Tufting technique
3/10Scope and Objectives
1. I. K. Partridge, S. R. Hallett, Phil. Trans. R. Soc. A., 2016.2. C. Osmiani, G. Mohamed, J. W. G. Treiber, G. Allegri, I. K. Patridge, Composites Part A, submitted
2016.
Application of a developed modelling strategy1,2 to tufted composites
Single Microfastener Testing
Coupon Tests for Arrays
Complex Test Cases
Micro-Scale FE Models
Meso-Scale FE Models
Modelling of Complex Cases
Analytical Modelling
Cohesive zone m
odelling
Multi-Scale Characterisation and Modelling of Tufted Composites
4/10Scope and Objectives
1. I. K. Partridge, S. R. Hallett, Phil. Trans. R. Soc. A., 2016.2. C. Osmiani, G. Mohamed, J. W. G. Treiber, G. Allegri, I. K. Patridge, Composites Part A, submitted
2016.
Application of a developed modelling strategy1,2 to tufted composites
Single Microfastener Testing
Coupon Tests for Arrays
Complex Test Cases
Micro-Scale FE Models
Meso-Scale FE Models
Modelling of Complex Cases
Analytical Modelling
Cohesive zone m
odelling
Multi-Scale Characterisation and Modelling of Tufted Composites
5/10
Elastic deformation of tuft and composite
Debonding and frictional sliding
Micro-Scale Modelling
Single Tuft Testing Micro-Scale FE Models
Analytical Modelling
Release film
Debonding
Tuftfracture
• 0°/90° carbon fibre NCF, 410 gsm• Carbon fibre thread (Tenax-J HTA40)• Epoxy Momentive 935/936
Pristine
Failed
Multi-Scale Characterisation and Modelling of Tufted Composites
Failureevents
6/10Micro-Scale Modelling
Single Tuft Testing Micro-Scale FE Models
Analytical Modelling
Bonded Regime Debonding RegimeThe analytical model is calibrated
against experimental bridging laws
2w Simulation of tuft bridging mechanisms
Multi-Scale Characterisation and Modelling of Tufted Composites
7/10Micro-Scale Modelling
Single Tuft Testing Micro-Scale FE Models
Analytical Modelling
1 mm Resin pockets
Impregnated tufting thread
segments
Top half
Bottom half
• Abaqus 6.14, Explicit• Tuft-composite and yarn-yarn
interfaces modelled with cohesive contact
• Post-cure cool down thermal step• Implemented failure criterion for
yarns in each thread segment
Multi-Scale Characterisation and Modelling of Tufted Composites
8/10Meso-Scale Modelling
Single Tuft Testing
Coupon Tests for Arrays
Complex Test Cases
Micro-Scale FE Models
Meso-Scale FE Models
Modelling of Complex Cases
Analytical Modelling
Cohesive zone m
odelling
Multi-Scale Characterisation and Modelling of Tufted Composites
• Two sets of cohesive elements: ply-ply interface and tufted interface.
• User defined material (VUMAT) to incorporate tuft constitutive bridging law in the models.
9/10Future Work
Single Tuft Testing
Coupon Tests for Arrays
Complex Test Cases
Micro-Scale FE Models
Meso-Scale FE Models
Modelling of Complex Cases
Analytical Modelling
Cohesive zone m
odelling
Multi-Scale Characterisation and Modelling of Tufted Composites
• Is it possible to define bridging maps for tufts?• Application of the models for failure prediction of structural
parts (tufted T-joints3).3. J. Kratz et al., Improving the damage tolerance of composite joints with
tufting, ICCM20, 2015
10/10
Multi-Scale Characterisation and Modelling of Tufted Composites
Acknowledgments
Thank you!
Any questions?