Dynamic State or Whole Field Analysis of Helical Gear

Abstract

To determine the true bending stresses at the root of the tooth is an important and crucial step in accurate design of the gears. The present work has been intended for bending stress analysis at critical section of helical gear tooth under dynamic state by different methods. The photo stress coating method along with reflection polariscope was used as experimental method. Velocity factor method and Spott’s equation method have been used to estimate dynamic load and bending stress at critical section of tooth. LS DYNA software has been used for finite element analysis under dynamic state. The results show that the experiment photo stress method gives bending stress closer to the true value in dynamic conditions amongst all method under consideration. Finally, the study proposes the correction factor for velocity factor method and Spott’s equation method to estimate true bending stress at tooth root with respect to experimental method.