Quantitative investigation of local strain and defect formation in short glass fibre reinforced polymers using X-ray computed tomography

Julia Maurer, Dietmar Salaberger, Michael Jerabek, Johann Kastner, Zoltán Major

Research output: Contribution to journalArticlepeer-review

Abstract

Knowledge of the mechanical behaviour, especially at the microscale level, is of great importance for a better understanding of the failure mechanisms of injection-moulded glass fibre reinforced polymers. Furthermore, knowledge about deformation and damage processes helps to improve the quality of structural simulations. Interrupted in situ tensile testing by X-ray computed tomography allows a stepwise, time-dependent investigation of the local strain and defect formation. The objective of this work is the determination of strains by Digital Volume Correlation and the segmentation and characterisation of defects. The correlation between different defect types (matrix fracture, fibre-matrix debonding, fibre fracture and fibre pull-out) and fibre orientation is shown. Defect localisation and volume and their relation to local strain are illustrated. The investigation of strain hot spots at low load levels allow for the prediction of the position of fracture onset. Moreover, the strain distribution at higher load levels can be used to comprehend the fracture surface. Various evaluation and visualisation approaches that enable simultaneous analysis of defects and strains are demonstrated.

Original languageEnglish
Pages (from-to)1-19
JournalNondestructive Testing and Evaluation
Early online date30 May 2022
DOIs
Publication statusE-pub ahead of print - 30 May 2022

Keywords

  • Glass fibre reinforced polymers
  • X-Ray computed tomography
  • defect characterisation
  • digital volume correlation
  • in situ tensile testing

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