Akademik Veri Yönetim Sistemi
MATERIALS & DESIGN, cilt.29, sa.7, ss.1419-1426, 2008 (SCI-Expanded)
The objective of the study is to investigate the residual mechanical properties of cross-ply carbon fibre reinforced polyphenylenesulphide (C-PPS) composites after particle erosion. Angular silica sand particles with the size of 150-200 mu m are driven by a static pressure of 1.5, 3 and 4.5 bar and are accelerated along a 50 mm long ceramic nozzle of 5 mm diameter at room temperature. The average velocity of the silica sand at these pressures at the nozzle tip was measured as 20, 40 and 60 m/s with respect to the air pressure. Composite samples clamped on to the specimen holder. The samples on specimen holder were subjected to particle flow at impingement angles between 15 degrees and 90 degrees. Erodent mass flow was measured as 4.25, 6.25 and 9 g/s for average velocities of 20, 40 and 60 m/s, respectively. Wear rates were measured by means of weight loss with an electronic balance with an accuracy of 0.1 mg after 2-30 s of particle erosion. The impingement angle was found to have a significant influence on erosion rate. Composite material showed semi-ductile erosion behaviour, with a maximum erosion rate at impingement angle of 45 degrees. The morphology of eroded surfaces was examined by using scanning electron microscope (SEM). Possible erosion mechanisms were discussed. The erosion behaviour was not only considered as a material loss but also as exposuring of repeated impacts by means of particles. Great differences were observed between the initial and post-erosion flexural strength of the material. It was concluded that the minimum residual strength values were determined for the samples eroded at impingement angle of 45 degrees. Also the samples are found having lower residual flexural properties at higher impingement angles. (C) 2007 Elsevier Ltd. All rights reserved.