A SIMPLE EVALUATION METHOD FOR THE INTERFACIAL PROPERTY UNDER COMPRESSION LOAD WAS PROPOSED AND DEMONSTRATED FOR E-GLASS FIBER-REINFORCED EPIKOTE 828 TREATED WITH VARIOUS AMOUNTS OF AMINOPROPYLTRIETHOXYSILANE (IOTA) COUPLING AGENT. THREE MODES OF FAILURE WERE OBSERVED, AND THE RELATION BETWEEN THE NUMBER OF EACH TYPE OF FRACTURE AND THE IOTA SURFACE TREATMENT WAS STUDIED. IT WAS DEDUCED THAT FIBER-MATRIX SLIP TENDED TO OCCUR IN THE CASE OF NON-IOTA AND 1.0 WT.% ...
GFRP laminates were creep tested in two different environments; one was air and the other was 5% Nitric acid. Acoustic emision (AE) was dependent on the creep stress and the type environment used. In general AE count rate increased with increasing creep stress. Laminates tested in acid produced higher number of AE counts than the laminates tested in air. This attributed to the stress corrosion cracking of specimens tested in ...
Axial compressive tests have been carried out on carbon fibre/epoxy and carbon fibre/PEEK tubes made from unidirectional prepreg materials. Three fibre architectures were investigated: unidirectional fibres parallel (0 degrees) to the axis of the tube, +/- 30 degrees and +/- 45 degrees. One set of tubes was machined with a 45 degrees chamfer at one end in an attempt to trigger progressive crushing and the other set had square ends ...
An embedded single-filament shear-strength test was employed to explore the effect of the reinforced interface on the fracture of single filaments in glass fibre-epoxy resin composites. The interfacial effect was evaluated not only by critical fibre length but also by the fracture process of an embedded single filament observed by applying tensile load to the composites. The mean fragment length, measured at different tensile stresses, decreased with an increase in ...
Unskillful design of joints often causes reduction of the bearing capacity of composite structure. Therefore, special attention must be given to the design of the fasteners. A method is presented here which predicts the failure strength and failure mode of mechanically fastened joints in FRP. The stress distribution considering of the effect of the pin is calculated by the use of FEM. The failure load and failure mode are predicted ...
Reports by Author
