2- A pin-on-disk friction testing apparatus involves the unlubricated rounded end of a copper pin of...
2- A pin-on-disk friction testing apparatus involves the unlubricated rounded end of a copper pin of 80 Vickers hardness being pressed with a force of 20 N against the surface of a rotating disk made of wrought-aluminum alloy 2014- T6 having a 135 Brinell hardness. The rubbing contact is at a radius of 16 mm; the disk rotates 80 rpm. After 2 hours the pin and disk are weighed. It is determined that adhesive wear has caused weight losses equivalent to wear volumes of 2.7 and 0.65 mm3 for the copper and Aluminum, respectively. Compute the wear coefficients. (40 points) F = 20 N Copper pin 80 Vickers IF Disk (AI 2014-T6) 135 Bhn r = 16 mm 80 rpm Pin Pin volume kost-2.7 mm -Disk volume lost = 0.65 mm 12h Disk Initial profiles Final profiles