Session: PTG-02-02: Gear Analysis, Materials, and Fatigue 2

Paper Number: 116926

116926 - An Experimental Study on the Accuracy of Cumulative Damage Models in Gear Tooth Bending Fatigue 

Tooth bending fatigue failure is a primary design concern for gear designers in power transmission applications. Fracture of a gear tooth in operation results in overload conditions to adjacent teeth and cascades the failure.  Total loss of power transmission usually occurs within seconds of the primary failure.  While standard constant amplitude fatigue evaluations are common to experimentally determine probabilistic stress life (PSN) relationships, they do not directly measure the fatigue lives under complex, non-constant amplitude loading scenarios applied to gears in most applications. Various cumulative damage models exist to address the task of estimating fatigue life under duty cycle loading but their accuracy is both material and stress state dependent.  Most models are validated under only uniaxial stress states and for limited materials.  There is a void of experimental data that would enable the evaluation of the accuracy of cumulative damage models for gear tooth bending fatigue in typical case carburized gear steels.  This research study conducts a standard fatigue evaluation along with a set of dual-load level single tooth bending fatigue tests to empirically determine the effects of multi-stage loading.  Various cumulative damage fatigue models are then employed to estimate the fatigue lives of the dual-load level tests and the accuracy of each model is accessed.

Presenting Author: Isaac Hong OSU

Presenting Author Biography: Dr. Isaac Hong is a Research Assistant Professor in the Department of Mechanical and Aerospace Engineering at The Ohio State University. He received his Ph.D. degree in Mechanical Engineering from Ohio State in 2019. Dr. Hong also serves as a faculty advisor within the Gear and Power Transmission Research Laboratory (GearLab) at OSU. His research focuses on novel methods to monitor and characterize structural integrity of power transmission machine elements. This includes developing theoretical models and experimental methods to define fatigue, dynamic response, and tribological characteristics of gears and bearings.

Authors:

Gabriel Anichowski The Ohio State University
Riley Damm The Ohio State University
Ahmet Kahraman The Ohio State Univeristy
Isaac Hong OSU