Composites Research Group
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Damage Modelling of Composites

Textile reinforcements are widely used in composite manufacturing in automotive sector. Predictive models which support a modern product development usually impose idealised meso-scale geometry on the textile reinforcements. However, composite manufacturing introduces defects into the structure of textile reinforcement making it irregular. This study aimed to implement a more realistic meso-scale model which included structural variability of the geometry (defects) in order to create better predictive models for mechanical properties of the composites. Case studies included analysis of 2D and 3D textile composites. Understanding of effect of the defects on mechanical properties will result in higher confidence of predictive modelling of composites.

Investigators:

Researcher: Mikhail Matveev

 

Case study 1 

  • Twill weave laminate, carbon fibre/epoxy, volume fraction 55%
  • Abaqus + periodic boundary conditions + UMAT subroutine
  • Results predicted within 10% of experimental values

Experimental and predicted stress-strain curves

Experimental and predicted stress-strain curves - case study 1

 

Damage progression in yarns transverse to loading direction (at strains 0.9%, 1% and 1.2%)

Damage progression in yarns transverse to loading direction - at strains 0.9%

Damage progression in yarns transverse to loading direction - at strains 1%

Damage progression in yarns transverse to loading direction  - at strains 1.2%

 

Meso-scale model

Meso-scale model - Case study 1

 

 

 

Case study 2

  • 3D woven textile, carbon fibre/epoxy, volume fraction ~55%
  • Abaqus + periodic boundary conditions + UMAT subroutine
  • Results predicted within 10% of experimental values

Experimental and predicted stress-strain curves

Experimental and predicted stress-strain curves - case study 2

 

Meso-scale model

Meso-scale model - Textile Composites

Correct prediction of the fracture surface

SEM image

SEM image - Textile Composties

Correct prediction of the fracture surface - Textile Composites

 

Case study 3

  • Idealised meso-model VS realistic model
  • 3D woven textile, carbon fibre/epoxy
  • Yarn misalignments have a significant effect on properties of the 3D woven composite
case study 3 - graph
 

Idealised model

Idealised model - Textile Comps

Micro-CT scan

Micro-CT scan - Textile Comps

 

Realistic model

Realistic model - Textile Comps

 

 

Composites Research Group

Faculty of Engineering
The University of Nottingham
University Park
Nottingham, NG9 5HR


contact: Prof Nick Warrior
email: composites@nottingham.ac.uk