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Modeling of deformation of different layers during the AFP process. Presented By: Hossein Ghayoor Supervised By: Dr. Suong V. Hoa. Introduction. Viscoelastic properties Different properties of each layer Effect of time and temperature

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modeling of deformation of different layers during the afp process

Modeling of deformation of different layers during the AFP process.

Presented By: HosseinGhayoor

Supervised By: Dr. Suong V. Hoa

introduction
Introduction
  • Viscoelastic properties
  • Different properties of each layer
  • Effect of time and temperature
  • Understanding of residual stress and final state of material after manufacturing
introduction1
Introduction

Different Temperature

Different Properties

Viscoelastic Problem

Last Layer

Layer 3

Layer 2

Layer 1

Mold

Figure From: Analysis of Process-Induced Residual Stresses in Tape Placement, F. Sonmez, H. T. Hahn, M. Akbulut, J. of Thermoplastic Composite Materials, 2002

viscoelastic properties of carbon peek
Viscoelastic Properties of Carbon-PEEK
  • Creep Properties of PEEK
  • Carbon fiber remains elastic

Figure From: Characterization and modeling of nonlinear viscoelastic response of PEEK resin and PEEK composites, X.R. Xiao, C.C. Hiel, A.H. Cardon, Composite Engineering, 1994

viscoelastic properties of carbon peek2
Viscoelastic Properties of Carbon-PEEK

The increase in number of unit cell columns (horizontal)

Five by five block of unit cell minimizes the effect of boundary conditions

The increase in number of unit cell rows (vertical)

viscoelastic properties of carbon peek3
Viscoelastic Properties of Carbon-PEEK

Creep/ Relaxation Properties of Carbon-PEEK composite

homogenized properties of carbon peek
Homogenized Properties of Carbon-PEEK

C22

Figure From: A thermoviscoelastic analysis of process-induced internal stresses in thermoplastic matrix composites, SunderlandP., Yu W., Manson J., Polymer Composites, 2001

new boundary conditions
New Boundary Conditions

Attaching the nodes in the stiffness matrix

multi layer
Multi-Layer
  • Each 8-noded viscoelastic element can represent a unit cell (computational time is manytimes less)
  • Different Scenarios can be analyzed
  • Timing, thickness, temperature can be changed in the analysis
typical analysis result
Typical Analysis Result

two-step constant stress (one layer)

One-step constant stress (one layer)

typical analysis result1
Typical Analysis Result

One-step ramp stress (one layer)

Maximum Strain

Time(s)

typical analysis result2
Typical Analysis Result

Strain in the first layer (ramp stress)

Maximum Strain

Depositing second layer

Time(s)

typical analysis result3
Typical Analysis Result

Strain in first layer (ramp stress)

Maximum Strain

fifth layer deposited

fourth layer deposited

third layer deposited

Second layer deposited

Time(s)

conclusion
Conclusion
  • Residual Strain/Stress can be predicted and can be used in manufacturing design to optimize the design.
  • With developed modeling method different Scenarios of Manufacturing in terms of Timing, Thickness can be modeled and analyzed.