Fracture behaviour of hybrid glass matrix composites: thermal ageing effects

0178106 - UFM-A 20033125 RIV GB eng J - Journal Article
Dlouhý, Ivo - Chlup, Zdeněk - Boccaccini, D. N. - Atiq, S. - Boccaccini, A. R.
Fracture behaviour of hybrid glass matrix composites: thermal ageing effects.
Composites Part A-Applied Science and Manufacturing. Roč. 34, č. 12 (2003), s. 177-1185. ISSN 1359-835X. E-ISSN 1878-5840
R&D Projects: GA AV ČR IAA2041003; GA MŠMT ME 491
Institutional research plan: CEZ:AV0Z2041904
Keywords : glass matrix * hybrid composites * fracture toughness
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 1.131, year: 2003
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The thermal aging of a glass matrix composite reinforced by short carbon fibres as well as by ZrO2 particles (hybrid composite) was investigated at temperatures in the range 500-700 C for exposure durations of 24 h in air. The mechanical properties of as-received and aged samples were evaluated at room temperature by using the three-point flexure chevron notch technique. The fracture toughness values of as-received specimens were in the range 2.6-6.4 MPam1/2. Fracture toughness was affected by the thermal aging conditions. For thermal aging at temperatures < 700 C, degradation of fibre-matrix interfaces occurred and therefore the apparent fracture toughness and flaw tolerant resistance decreased. For the most severe ageing conditions tested (700 C / 24 h), fracture toughness values dropped to 0.4 MPam1/2. Significant degradation of the material was detected for this aging condition, mainly characterised by porosity formation in the matrix as a result of softening of the glass and oxidation of the carbon fibres.
Permanent Link: http://hdl.handle.net/11104/0074999