Analytical Modeling of Liquid and Solid Particle Erosion.

摘要

The analytical model for the erosion of a brittle material by multiple particle impacts is revised in accordance with microscopic observations of the erosion damage due to the direct impact of glass beads. Procedures are described for obtaining the quantitative data required to make the model a predictive tool. Erosion tests were conducted in the AFML-Bell erosion facility using 70and 290micron diameter glass beads and uniformly-graded quartz sand impacting flat-faced specimens or borosilicate glass directly and at an oblique angle. Excellent agreement was found between the average ring fracture diameter and the diameter of the contact area predicted by the Hertzian theory of impact for the glass bead impacts. The damage mechanisms for glass plates impacted by sand particles and liquid drops were investigated through microscopic examination of the progressively-eroded surfaces. Weight-loss data are available for ultra-high molecular weight polyethylene,nickel-coated glass-fiber reinforced epoxy,and graphite-fiber reinforced epoxy specimens exposed to rain and sand erosion environments. (Modified author abstract)