Username   Password       Forgot your password?  Forgot your username? 


Comparison of Fatigue Reliability Life of Telescopic Rod of an Eccentric Telescopic Rod Conveyor with and without Strength Degradation

Volume 15, Number 7, July 2019, pp. 1868-1877
DOI: 10.23940/ijpe.19.07.p13.18681877

Yingsheng Mou, Zhiping Zhai, Xiaoyun Kang, Zhuwei Li, and Yuezheng Lan

College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China


(Submitted on March 13, 2019; Revised on May 25, 2019; Accepted on June 25, 2019)


Eccentric telescopic rod conveyors are used to convey straw from chain conveyors to the feeding and compression mechanism of the 4FZ-2000A type self-propelled straw harvesting baler. As the main working component, the telescopic rod endures higher dynamic loads while conveying the straw. This will make the telescopic rod prone to fatigue fracture. Therefore, it is necessary to find a feasible model that can accurately estimate the fatigue reliability life of the telescopic rod. In order to ensure the safe working of the eccentric telescopic rod conveyer, a mechanical model of the main bearing parts of the telescopic rod is established, and virtual prototype technology is used to obtain the work load spectrum borne by the telescopic rod. Static analysis of the telescopic rod using the finite element method shows that the telescopic rod experiences multi-axial stress fatigue, and the critical section is determined. The S-N curve equation of the structure modified by the surface mass and stress gradient, critical plane approach, Miner's cumulative fatigue linear damage model, and Gaussian normal distribution model of fatigue life are used to estimate the fatigue life of the telescopic rod. In order to predict the fatigue life of the telescopic rod accurately, fatigue reliability lives are calculated with and without consideration of the strength degradation. The results show that: (1) the fatigue life prediction without considering the strength degradation is far different from practical experience; the results obtained after considering the strength degradation are more conservative and more consistent with the actual fatigue lives. The prediction results are more accurate. (2) When the strength degradation is considered, the modified Gerber correction method is more accurate than the Goodman correction method. The results of this study can provide a reference for the fatigue reliability analysis and optimization of eccentric telescopic rod conveyors.


References: 17

  1. J. F. An, Y. Wang, T. Zhang, T. G. Wang, and F. W. Zhang, “The Improvement Design on Telescopic Rod Type Collecting Roller of Residual Film Recycling Machine,” Agricultral Equipment & Vehicle Engineering, Vol. 52, No. 3, pp. 7-9, 2014
  2. G. H. Li, Z. Zheng, Y. Zhao, and Q. Niu, “The Design and Improvement of Eccentric Roller Type Residual Film Pickup Device,” Xinjiang Farm Research of Science and Technology, Vol. 38, No. 11, pp. 31-32, 2015
  3. Z. Q. Tian, “Research on the Design of Caragana Picking and Shredder,” Master Dissertation, Shanxi Agricultural University, 2014
  4. A. D'Amore and L. Grassia, “Constitutive Law Describing the Strength Degradation Kinetics of Fibre-Reinforced Composites Subjected to Constant Amplitude Cyclic Loading,” Mechanics of Time-Dependent Materials, Vol. 20, No. 1, pp. 1-12, 2016
  5. X. Zhao, X. Wang, Z. S. Wu, and Z. G. Zhu, “Fatigue Behavior and Failure Mechanism of Basalt FRP Composites under Long-Term Cyclic Loads,” International Journal of Fatigue, Vol. 88, pp. 58-67, 2016
  6. A. Ince, “A Generalized Mean Stress Correction Model based on Distortional Strain Energy,” International Journal of Fatigue, Vol. 104, pp. 273-282, 2017
  7. D. H. Hwang and S. S. Cho, “Mean Stress Effects in Fretting Fatigue Life Estimation Method using Fatigue Damage Gradient Correction Factor,” Journal of Mechanical Science & Technology, Vol. 31, No. 9, pp. 4195-4202, 2017
  8. D. J. Bang, A. Ince, and L. Q. Tang, “A Modification of UniGrow 2‐Parameter Driving Force Model for Short Fatigue Crack Growth,” Fatigue & Fracture of Engineering Materials & Structures, Vol. 42, pp. 45-60, 2019
  9. C. B. Su, Y. Shui, Z. L. Wang, and T. Zafar, “A Time-Dependent Probabilistic Fatigue Analysis Method Considering Stochastic Loadings and Strength Degradation,” Advances in Mechanical Engineering, Vol. 10, No. 7, pp. 1-9, 2018
  10. Z. Q. Fu, Y. X. Wang, B. H. Ji, and T. J. Liu, “Assessment Approach for Multiaxial Fatigue Damage of Deck and U-Rib Weld in Steel Bridge Decks,” Construction and Building Materials, Vol. 189, pp. 276-285, 2018
  11. J. X. Gao and Z. W. An, “A New Probability Model of Residual Strength of Material based on Interference Theory,” International Journal of Fatigue, Vol. 118, pp. 202-208, 2019
  12. Z. H. Yu, W. M. Wang, H. M. Cui, and S. H. Wu, “Static Analysis of the Elastic Teeth of the Spring-Toothed Pickup Device,” Journal of Agricultural Mechanization Research, Vol. 39, No. 4, pp. 27-31, 2017
  13. X. Y. Kang, “Research on Parameter Analysis and Optimization Design of Eccentric Telescopic Rod Conveying Device,” Master Dissertation, Inner Mongolia University of Technology, 2018
  14. H. Liu, “Numerical Simulation of the Influence of Surface Integrity on Fatigue Properties,” Master Dissertation, Huazhong University of Science and Technology, 2014
  15. H. B. Lv and W. X. Yao, “Residual Strength Model for Component Fatigue Reliability Estimation,” Acta Aeronautica Sinica, Vol. 21, No. 1, pp. 74-77, 2000
  16. F. J. Zuo, “Research on Fatigue Life Prediction and Reliability Method of Mechanical Structures,” Master Dissertation, University of Electronic Science and Technology of China, 2016
  17. J. R. Schaff and B. D. Davidson, “Life Prediction Methodology for Composite Structures. Part I- Constant Amplitude and Two-Stress Level Fatigue,” Journal of Composite Materials, Vol. 31, No. 2, pp. 128-157, 1997


Please note : You will need Adobe Acrobat viewer to view the full articles.Get Free Adobe Reader

This site uses encryption for transmitting your passwords.