Effect of loads, sliding speeds and times on the wear rate for different materials

A study has been made on the wear rate for different materials (Steel, Aluminum and brass) under the effect of sliding speed, time and different loads, where the apparatus pin on disc has been used to study the specification of the adhesion wear. The experiments has been performed on a group of specimens under different cases of times (5 to 30) minutes, and under different loads (0.5 to 2) Kg, and different speeds (2.5 to 9) m/sec. A mathematical model has been made for all cases that were studied depending on the method of least squares which helps in foretelling about the wear rate through the knowledge of time limits as a variable with fixing the other variables; also building a model with the same method by which foretelling the rate of adhesive wear through knowing the sliding speed as a variable after fixing the other variables, also making another model foretelling the rate of adhesive wear through knowing the variable loads. A study was made for the damaged surface from wearing for the aluminum alloy as a sample to illustrate the wear lines to the direction of the formation of wear; and from the results, it was clear that the cracks which are vertical on the direction of sliding and will meet together with the lines of weariness, and the results will show that the rate of adhesion wear will be direct proportional with (time, sliding speed and load) , and the low carbon steel has less wear rate than the other materials.