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Evaluation of Bending Fatigue Testing of Austempered Ductile Iron Spur Gears
Jian Hua Lv(려건화),Rui Zhou(주서),Yang Xu(허양),Zhen Qin(진진),Qi Zhang(장기),Sungki Lyu(류성기) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
An experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears was performed using a Zwick fatigue tester. The gear material was manufactured using vertical continuous casting, resulting in the radius of the graphite grains being smaller. The stress-number of cycles curve (S-N curve) for the bending fatigue strength of the ADI spur gears thus manufactured, without any specific surface treatments, was obtained using post-processing software. It was observed that when the reliability was 50%, the allowable root stress was 610 MPa. was calculated using an analytical method as well as the finite element method, and the difference between the values calculated using the two methods is only 7%. This study provides a reliable basis to rate the reliability design of small gearboxes in automation in the future.
Fatigue Life Analysis and Experimental Study of the Input Shaft of 6-Speed Automatic Transmission
려건화(Jianhua Lv),종흥(Xing Zhong),주서(Rui Zhou),진진(Zhen Qin),장기(Qi Zhang),류성기(Sungki Lyu) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.8
The input shaft of gearbox usually bears a cyclic variation of torque, which may lead to the risk of experiencing a fatigue fracture. To evaluate the fatigue life accurately and identify the weak parts, the ANSYS is used to simulate the torsional fatigue of the input shaft for the gearbox, and the fatigue life of the weak part is obtained, which is then tested and verified by the torsional fatigue testing in the MTS torsional fatigue test rig. The test results show that the maximum difference is 14% between the calculated life and the testing results, indicating that the simulation value can reflect the actual fatigue life accurately. Notably, the cracks appear in the large oil holes, and its life is mainly concentrated in the crack initiation stage, accounting for 99.2% of the total life. The analysis results show that the fatigue life of the software simulation has the guiding significance for the life evaluation. The fatigue life of the shaft can be quickly calculated by the simulation to reduce the number of fatigue tests and achieve cost-effectiveness.