Rotation creep testing of glass-epoxy composite
Bazyli Krupicz*, Aleksy Patejuk*, Wiktor W. Barsukow** *Politechnika Białostocka, Wydział Mechaniczny, ul. Wiejska 45C, 15-950 Białystok **Grodzieński Państwowy Uniwersytet im. J. Kupały, ul. Orzeszkowej, Grodno, Białoruś
Quarterly No. 1, 2005 pages 85-89
DOI:
keywords:
abstract In the paper, results of creep testing on epoxide resin composite with constant M(t) = const and variable torque M(t) = = Mm (1+Aσsin 2πνt) have been presented (Fig. 2). Samples in the form of tubes with internal diameter of dw = 30 mm, wall thickness of 2 mm and testing length of lo = 100 mm were used to the testing (Fig. 1). Epoxy resin Epidian 5 cured by triethylenetetraamine constituted the composite’s matrix. Roving stripes in the amount of 32% of total weight placed at an angle of ±30÷45º reinforced the composite. Torsional strength Rs and Kirchoff module G were determined for the tested composite samples (Fig. 3). Investigation from results at the static load (Fig. 4) were the ground for the assumption that the tested composite is linear-viscoelastic, for which creeping core K(t) was determined. During dynamic creep, histeresis loops were recorded. Based on them, complex modulus G, its storage modulus part G', loss modulus part G'' and loss tangent tgφ were calculated (Fig. 5). Presented values were compared with the values calculated from experimentally determined creeping core. Identified differencies among G, G', G'' and tgφ values (Fig. 5) were the results of material properties of composite components, i.e. viscoelastic matrix (epoxy resin) and elastic reinforcement (fibreglass). Key words: glass-epoxy composite, creep, dynamic creep (vibro-creep), modulus