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Department of Materials Engineering
PhD defence
04 May 2015
Prof. dr. ir. Stepan Lomov
Prof. dr. ir. Ignaas Verpoest
Prof. dr. ir. Wim Van Paepegem
IWT Baekaland
[email protected]
Hybrid Multi-Scale Modelling Of Damage And Fatigue In Short Fiber
Reinforced Composites
Introduction / Objective
The main goal of this project is to develop, implement, and validate methodologies for the fatigue evaluation of short fiber
reinforced composites (RFRC) that are based not only on material tests but on a combination of manufacturing
simulation, micromechanical modeling and macroscopic fatigue behavior (Hybrid Multiscale Model).
Research Methodology
A four step research strategy was used for the thesis:
Step 1: Choose the correct mean field homogenization scheme
Step 2: Micromechanics based damage model for SFRC
Step 3: Damage at the constituent level is linked to the macroscopic fatigue properties
Step 4: Process integration and validations
Each of the 4 steps are validated either by experimental tests and/or full FE calculations
Results & Conclusions
• Mori-Tanaka formulation is found to be the most appropriate
mean field homogenization scheme (Fig 1)
• EqBI concept for treating fiber matrix debonding was developed
and validated by full FE calculations (Fig 2)
• Master SN curve approach developed to predict the local SN
curves ~ only 1 SN curve is needed as input
Fig 1: Mori-Tanaka formulation
predicts the stresses in individual
inclusions correctly while PGMT fails
Framework for fatigue simulation is developed and validated for
component “Pinocchio” (Fig 3)
Fig 2: FE validation of the EqBI concept is
performed by using contact surfaces of
varying area
Fig 3: Stress contour and critical areas in Pinocchio
Major publication
Jain, A., Lomov, S.V., Abdin, Y., Verpoest, I., Van Paepegem, W., "Pseudo-grain discretization and full Mori-Tanaka
formulation for random heterogenous media: Predictive abilities for stresses in individual inclusion and
matrix" Composites Science and Technology. 87(0): p. 86-93.

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