Stress relaxation behaviour of glass fibre reinforced thermoplastic composites and its application to the design of interrupted in situ tensile tests for investigations by X-ray computed tomography

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

Research output: Contribution to journalArticlepeer-review

Abstract

In situ investigations by X-ray computed tomography are widespread and have become very important for studying damage mechanisms in materials. Interrupted in situ tensile tests by X-ray computed tomography with laboratory devices have to be performed in displacement-controlled mode. In this regard, it is crucial to know at which point almost a steady state of the loaded specimen can be expected and thus an X-ray computed tomography scan at good data quality can be achieved. This study investigates the relaxation behaviour of injection moulded glass fibre reinforced polypropylene. Relaxation tests, according to a single loading and an interrupted in situ testing manner, are performed on different specimen geometries with varying fibre orientation distributions. An extension of the Kohlrausch-Williams-Watts function is used for modelling the relaxation behaviour. Two different approaches are presented in context of the proposed methodology. One approach is based on a look-up diagram and the other is the on-the-fly check during testing. The suggested methodology allows a coarse design and enables time saving optimizations of such in situ investigations.

Original languageEnglish
Article number107551
Pages (from-to)107551
JournalPolymer Testing
Volume109
DOIs
Publication statusPublished - May 2022

Keywords

  • Analytical model
  • Glass fibre reinforced polymers
  • Mechanical testing
  • Non-destructive testing
  • Stress relaxation

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