Journal
COMPOSITE STRUCTURES
Volume 290, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2022.115472
Keywords
Polymer-matrix composites; porosity/voids; Strength; CT analysis
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Funding
- Rolls-Royce plc through Composites University Technology Centre (UTC) at University of Bristol
- Engineering and Physical Sciences Research Council (EPSRC) through Centre for Doctoral Training in Advanced Composites at University of Bristol [EP/L016028/1]
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This research focuses on predicting the short beam shear (SBS) strength of composite materials containing voids using X-ray CT scanning and mechanical testing, and considers the non-uniformity in shear stress distribution.
The presence of voids in composite materials reduces the material's strength, particularly matrix-dominated properties such as short beam shear (SBS) strength. Until now there has been no satisfactory way to reliably predict the effect of voids on SBS strength. Instead, there has been a reliance on using average void content combined with extensive testing to assess the linear reduction of strength with increasing void content to determine a 'knock-down' factor. Here, the reduced cross-sectional area is used to predict SBS strength of laminates containing voids. A detailed characterisation of the internal void location and morphology for numerous samples was obtained through X-ray CT scanning, prior to mechanical testing. The 'critical plane' in each sample, i.e. the length-width plane with the maximum cross-sectional area of voids was located and used to predict SBS strength. To additionally account for non-uniformity in the shear stress distribution, a stress scaling factor (SSF) is introduced.
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