Volume 9, Issue 6 (November 1981)
Erosion Behavior of Polystyrene
Erosion tests of polystyrene were made by impingement of glass beads at various attack angles and impact velocities. Two erosion damage peaks near the angles of 20 and 50°, which have never been observed on other materials, were found. In the erosion process near the peak of 50°, a characteristic ring-like damage pattern on the surface was recognized. To explain the experimental results, a new erosion mechanism based on the initiation and propagation of transverse cracks beneath the surface at the tip of longitudinal cracks was introduced. And by this mechanism, the erosion rate could be given by R = ρhS*/Mo where h, S*, and Mo are the factors describing the characteristics of the ring-like damage pattern and ρ is the density of material. The theoretical values agreed quite well with the experimental ones.