The investigation of inner structural damage of UV and heat degraded polymer composites using X-ray micro CT

• Published in: Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2011-04, Vol.42 (4), p.408-418
• Main Authors: Awaja, Firas, Nguyen, Minh-Tam, Zhang, Shengnan, Arhatari, Benedicta
• Format: Article
• Language: English
• Subjects: A. Polymer-matrix composites (PMCs); Applied sciences; B. Damage tolerance; carbon fibers; computed tomography; Cracks; D. Non-destructive testing; Damage; Degradation; delamination; digital images; E glass; epoxides; Exact sciences and technology; Forms of application and semi-finished materials; glass; Glass fiber reinforced plastics; heat; Laminates; Polymer industry, paints, wood; Polymer matrix composites; polymers; Structural damage; Technology of polymers; Three dimensional; X-radiation
• ISSN: 1359-835X; 1878-5840
• DOI: 10.1016/j.compositesa.2010.12.015

Accelerated UV degradation conditions were imposed on different epoxy resin composites reinforced with carbon fibre, 3D parabeam glass, and E-glass. X-ray micro computed tomography (XμCT) was used to evaluate the changes in the composites’ inner structure as a result of the treatment. Structural damage factors such as density changes, reinforcement filler damage, homogeneity, cracks and microcracks were examined. XμCT 3D images, 2D reconstructed slices and void calculations showed cracks in all composites with different shapes and volume in response to the UV degradation conditions. 3D-glass reinforced epoxy composites showed the least amount of damage in comparison with other composites. E-glass suffered the most damage upon UV degradation. Most of the structural damage in both 3D-glass and E-glass composites occurred in the resin matrix in the near-surface region, while internal damage was present in the form of delamination in the carbon fibre composite.