Influence of axial compressive strength on impact damage of glass fibre-epoxy resin thick walled composites
Henryk Leda, Szymon Kropaczewski Politechnika Poznańska, Instytut Inżynierii Materiałowej, pl. Skłodowskiej-Curie 5, 60-965 Poznań
Annals 4 No. 9, 2004 pages 74-78
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abstract Thick-walled glass fibre epoxy composites with thickness of 22 mm were manufactured and tested to determine the effect of compressive axial strength on their impact damage. The diameter of reinforcing E-glass fibre was 16 μm in all samples. Epoxy resins used as a matrix have vareid modulus and strength. Two sets of composites: ones with unidirectional in 0 and ones quasiisotropic in 0,±45.90 directions were manufactured. The volume fraction of glass fibers were 70%. The highest values of compressive strength, 700 MPa, were found for composites with high modulus matrix denoted AN. The lowest values in these compression tests were determined for samples with low modulus epoxy matrix denoted B. On the other hand, the tests of low energy impact resistance indicated best results of 4 J/cm3, for samples with medium modulus matrix denoted Abp (without accellerator). Samples with matrix B and AN accumulate less energy and were damaged at lower values of specific energy expressed as J/cm3 than samples with medium modulus Abp. The reason for unexpected low resistance to damage of AN samples is probably the degradation of their matrix caused by interaction with glass fibers at hardening temperature of 200°C. Key words: composites reinforced with glass fibres, axial compressive strength, impact damage resistance