Abstract
Bending fatigue tests of carburized gear in high cycle fatigue life regime were performed under stress ratio of 0.04. All the crack sources of the broken teeth are originated from the stress concentration on the surface of teeth root. By considering the effects of surface residual stress, notch effect, stress gradient and crack size, the predicted initiation life model of carburized gear is established by dislocation energy method. Meanwhile, based on the Paris Equation, the crack length a corresponding to fracture toughness and real crack propagation path, the predicted growth life model of carburized gear can be established. Finally, based on the behaviors of crack initiation and propagation, the whole life prediction model of carburized gear can be constructed, and the prediction accuracy of the model is within three times of the test life, which can be used to predict the bending fatigue life of carburized gear.
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Abbreviations
- σ r :
-
Residual stress
- \(\to _{A}\) :
-
Regression coefficient vector of \(\sigma_{{\text{r}}} = \to _{A} \cdot \to _{x}\)
- \(\to _{x}\) :
-
Depth vector
- \(\to _{B}\) :
-
Regression coefficient vector of \(C_{x} = \to _{B} \cdot \to _{x}\)
- \(\to _{C}\) :
-
Regression coefficient vector of \(x = \to _{C} \cdot \to _{{C_{x} }}\)
- \(\to _{{C_{x} }}\) :
-
The vector of carbon content at the depth of x
- C x :
-
Carbon content at depth x from the surface
- F t :
-
Nominal tangential force
- Y F :
-
Tooth shape coefficient
- Y s :
-
Stress correction coefficient
- b :
-
Tooth width
- m n :
-
Normal module of the gear
- Y ST :
-
Stress correction coefficient of the gear
- Y δ relT :
-
Sensitivity coefficient of the relative root fillet
- Y Rrelt :
-
Relative tooth root surface condition factor
- Y X :
-
Factor for calculating bending strength
- ΔK :
-
Stress intensity factor range
- ΔK inc -S :
-
Stress intensity factor range for surface inclusion
- U 1 :
-
Single slip band dislocation energy
- μ :
-
Shear modulus of matrix
- k :
-
Frictional stress of dislocations
- l :
-
Half the size of grain
- ΔU :
-
Incremental in dislocation energy
- Δτ :
-
Local shear stress range
- τ 1 :
-
Maximum shear stress
- τ 2 :
-
Minimum shear stress
- U i :
-
Increase of the dislocation energy of a single slip band under the action of the ith cyclic stress
- N i :
-
Predicted initiation life of gear bending fatigue
- N p :
-
Predicted growth life of gear bending fatigue
- W s :
-
Fracture energy for a unit area along the slip band
- d :
-
Grain size of martensite
- τ f :
-
Critical shear stress
- h :
-
Width of the slip band zone
- c :
-
Crack length in crack initiation region
- σ a :
-
Stress amplitude
- σ w :
-
Fatigue limit
- \(l^{*}\) :
-
Maximum crack length
- σ rs :
-
Surface residual stress
- N f :
-
Whole predicted bending fatigue life of carburized gear
- L :
-
Length of the finite element on the crack surface
- u b :
-
Displacements of nodes b in the x-axis
- u c :
-
Displacements of nodes c in the x-axis
- u d :
-
Displacements of nodes d in the x-axis
- u e :
-
Displacements of nodes e in the x-axis
- v b :
-
Displacements of nodes b in the y-axis
- v c :
-
Displacements of nodes c in the y-axis
- v d :
-
Displacements of nodes d in the y-axis
- v e :
-
Displacements of nodes e in the y-axis
- K th :
-
Crack stress intensity factor
- K IC :
-
Fracture toughness
- a :
-
Crack length in crack growth region
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Acknowledgments
The authors gratefully appreciate the financial support granted by Natural Science Foundation of Inner Mongolia (Nos. 2018BS05005, 2018NMKJ11 and 2021LHMS05009), Inner Mongolia Higher Education Research Project (No. NJZY21306), and Foundation Sciences Research Project of Inner Mongolia University of Technology (Nos. ZZ201801 and ZY202005).
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Deng, H., Guo, Y., Liu, H. et al. Bending Fatigue Life Prediction Model of Carburized Gear Based on Microcosmic Fatigue Failure Mechanism. J. of Materi Eng and Perform 31, 882–894 (2022). https://doi.org/10.1007/s11665-021-06236-8
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DOI: https://doi.org/10.1007/s11665-021-06236-8