Point-Surface-Origin Macropitting Caused by Geometric Stress Concentration - January/February 2011
The article "Point-Surface-Origin Macropitting Caused by Geometric Stress Concentration" appeared in the January/February 2011 issue of Gear Technology.
Point-surface-origin (PSO) macropitting occurs at sites of geometric stress concentration (GSC) such as discontinuities in the gear tooth profile caused by micropitting, cusps at the intersection of the involute profile and the trochoidal root fillet, and at edges of prior tooth damage, such as tip-to-root interference. When the profile modifications in the form of tip relief, root relief, or both, are inadequate to compensate for deflection of the gear mesh, tip-to-root interference occurs. The interference can occur at either end of the path of contact, but the damage is usually more severe near the start-of-active-profile (SAP) of the driving gear.
The article "Point-Surface-Origin Macropitting Caused by Geometric Stress Concentration" should appear in the box below, but if you do not see it, you can download it here.