Residual mechanical properties of carbon/polyphenylenesulphide composites after solid particle erosion: Fid-Bau Portal

Residual mechanical properties of carbon/polyphenylenesulphide composites after solid particle erosion

Sinmazçelik, Tamer / Fidan, Sinan / Günay, Volkan

AbstractThe 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 150–200μm are driven by a static pressure of 1.5, 3 and 4.5bar and are accelerated along a 50mm long ceramic nozzle of 5mm diameter at room temperature. The average velocity of the silica sand at these pressures at the nozzle tip was measured as 20, 40 and 60m/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° and 90°. Erodent mass flow was measured as 4.25, 6.25 and 9g/s for average velocities of 20, 40 and 60m/s, respectively. Wear rates were measured by means of weight loss with an electronic balance with an accuracy of 0.1mg after 2–30s 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°. 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°. Also the samples are found having lower residual flexural properties at higher impingement angles.