The Comparative Analysis of Crack Propagation in the Gear Tooth

1984 ◽  
pp. 971-982 ◽  
Author(s):  
J. Flasker ◽  
A. Jezernik
Keyword(s):  
Comparative Analysis ◽  
Crack Propagation ◽  
Gear Tooth

Fatigue Crack Propagation in a Gear Tooth in the Presence of an Inclusion

2014 ◽  
Vol 15 (3) ◽  
pp. 247-252 ◽  
Author(s):  
Vineet Agarwal ◽  
Pramod R. Zagade ◽  
Danish Khan ◽  
B. P. Gautham
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Gear Tooth

Dynamic characteristics of cracked gear and three-dimensional crack propagation analysis

2012 ◽  
Vol 227 (6) ◽  
pp. 1341-1361 ◽  
Author(s):  
Renping Shao ◽  
Purong Jia ◽  
Feifei Dong
Keyword(s):  
Crack Propagation ◽  
Dynamic Characteristics ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Beam Theory ◽  
Circular Crack ◽  
Propagation Path ◽  
Tooth Root ◽  
3D Crack Propagation ◽  
Three Dimensional Finite Element

The dynamic model and three-dimensional finite element analytical model of cracked gear structure are established respectively according to the cracked beam theory, and the dynamic characteristics (natural frequency, vibration shape) of cracked gear body are investigated. Further the influences of crack position and crack length on the dynamic characteristics of gear structure are simulated and discussed. On this basis, the fracture and damage of gear structure are investigated according to the theory of fracture mechanics. Using FRANC3D software, the three-dimensional (3D) propagation of crack at tooth root for involute gear is simulated, and stress intensity factor (SIF)s of semi-circular crack at tooth root including three types are analyzed, their variation laws are gained, then the expressions of SIFs are obtained by numerical fitting FEM results. Based on this, the 3D crack propagation path at tooth root is simulated and discussed, then, it is verified by comparing to experimental results, according to the mutation of the maximum SIF at crack tip, the fracture and damage of gear tooth are judged, and its work life also is predicted. These have very important value for damage monitoring and diagnosis of gear.

scholarly journals Consideration of Moving Tooth Load in Gear Crack Propagation Predictions

2000 ◽  
Author(s):  
David G. Lewicki ◽  
Lisa E. Spievak ◽  
Paul A. Wawrzynek ◽  
Anthony R. Ingraffea ◽  
Robert F. Handschuh
Keyword(s):  
Crack Propagation ◽  
Dimensional Analysis ◽  
Gear Tooth ◽  
Contact Region ◽  
Three Dimensional ◽  
Spur Gear ◽  
Calculated Stress ◽  
Prediction Techniques ◽  
Gear Crack ◽  
Element Method

Abstract Robust gear designs consider not only crack initiation, but crack propagation trajectories for a fail-safe design. In actual gear operation, the magnitude as well as the position of the force changes as the gear rotates through the mesh. A study to determine the effect of moving gear tooth load on crack propagation predictions was performed. Two-dimensional analysis of an involute spur gear and three-dimensional analysis of a spiral-bevel pinion gear using the finite element method and boundary element method were studied and compared to experiments. A modified theory for predicting gear crack propagation paths based on the criteria of Erdogan and Sih was investigated. Crack simulation based on calculated stress intensity factors and mixed mode crack angle prediction techniques using a simple static analysis in which the tooth load was located at the highest point of single tooth contact was validated. For three-dimensional analysis, however, the analysis was valid only as long as the crack did not approach the contact region on the tooth.

Crack Propagation in Gear Tooth Root

2008 ◽  
pp. 1237-1238
Author(s):  
S. Pehan ◽  
B. Zafosnik ◽  
J. Kramberger
Keyword(s):  
Crack Propagation ◽  
Gear Tooth ◽  
Tooth Root

Fatigue Crack Propagation Analysis of Gear Tooth Under Various Load Conditions and Repaired With Boron/Epoxy Patch

2013 ◽  
Author(s):  
Mir Ali Ghaffari ◽  
Shaoping Xiao
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Gear Tooth ◽  
Intensity Factors ◽  
Crack Trajectory ◽  
Propagation Analysis ◽  
Fatigue Crack Propagation Life ◽  
Load Conditions ◽  
Half Thickness

In this paper, 3D finite element analyses are conducted to study both crack trajectory and crack growth rate in a gear tooth. Fracture mechanics approach is employed here to model mixed-mode fatigue crack propagation in a gear tooth containing an initial fatigue crack. Two various load conditions are considered: the contact load acting along the whole thickness or the half thickness of gear tooth. Those two load conditions result in different crack trajectories, stress intensity factors and fatigue crack propagation lives of gear tooth. Furthermore, a cracked gear tooth can be repaired by composite patches. It is shown that Boron/Epoxy patches would enhance the fatigue crack propagation life of the gear-tooth.

Sign in / Sign up

Export Citation Format

Share Document