This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Endurance Limit Modifying Factors for Hardened Machined Surfaces
Annotation ability available
Sector:
Language:
English
Abstract
The fatigue strength of materials subjected to dynamic loads is routinely determined by using an ASTM standard rotating beam test. The test specimen is prepared very carefully and tested under closely controlled laboratory conditions. The resulting endurance limit is multiplied by the modifying factors to approximate the endurance limit of mechanical or structural components. Among a variety of modifying factors, surface finish is one of the more important ones. The existing data for surface finish modifying factor for steels is limited to a maximum hardness of 33 Rc. For steel components with a hardness of approximately 50 Rc, the existing surface finish modifying factors cannot be applied. The objective of this research is to develop surface finish modifying factor curves for steels with hardness in the range of 50 to 55 Rc. The results of this investigation not only provide surface finish modifying factors for high hardness steel components, but also demonstrate that the existing factors, if extrapolated to 50 Rc and beyond, would lead to overly conservative (excess weight and cost) designs.
Recommended Content
Authors
Citation
Shareef, I. and Hasselbusch, M., "Endurance Limit Modifying Factors for Hardened Machined Surfaces," SAE Technical Paper 961054, 1996, https://doi.org/10.4271/961054.Also In
References
- Johnson, R.C. “Specifying a Surface Finish that Won't Fail in Fatigue,” Machine Design 45 11 1973 108 109
- Bannantine, J.A. Comer, J.J. Handrock, J.L. “Fundamentals of Metal Fatigue Analysis,” Prentice-Hall Inc. 1990
- Lipson, C. Juvinall, R.C. “Handbook of Stress and Strain,” The Macmillan Co. New York 1963 69 77 99 137
- Morrow, J. “Significance of Residual Stress in Fatigue,” T. & A.M. Report No. 96 Department of Theoretical and Applied Mechanics, University of Illinois April 1956 1 18
- Morrow, J. “Fatigue Design Handbook,” Advances in Engineering 4 Society of Automotive Engineers Warrendale, Pa. 1968 21 29
- Smith, K.N. Watson, P. Topper, T.H. “A Stress-Strain Function for the Fatigue of Metals,” Journal of Materials 5 4 1970 767 778
- Shigley, J.E. Mischke, C.R. “Machine Design Handbook,” McGraw-Hill Book Company 5th 1989 269 315
- Socie, D.F. Mitchell, M.R. Caulfield, E.M. “Fundamentals of Modern Fatigue Analysis,” Department of ‘Theoretical and Applied Mechanics, University of Illinois April 1977 1 48
- Yang, P. Zhou, H. “Low-Cycle Impact Fatigue Of Mild Steel And Austenitic Stainless Steel,” Depart. of Materials Science, Nanchong University March 1994 567 570
- Bannantine, J.A. “A Variable Amplitude Multiaxial Fatigue Life Prediction Method,” Department of Materials Science and Engineering, University of Illinois October 1989 1 76
- Broek, D. Leis, B.N. “Fatigue Crack Initiation and Growth Analysis for Structures,” SAE Tech Report No. 790511 Battelle's Columbus Labs 1979
- Seshadri, T.V. Pierce, P.R. “Some Considerations in Using Strain-Life Approach in Fatigue Design,” SAE Tech. Paper No. 790889 R & D Division, Fruehauf Corp. 1979
- Boardman, B.E. “Selecting Equipment for Failure Analysis,” SAE Tech. Paper No. 790893 Deere & Co. 1979
- Tucker, L. Bussa, S. “The SAE Cumulative Fatigue Damage Test Program,” SAE Tech. Paper No. 750038 Deere & Co. and Ford Motor Co. 1975
- Chelsky, T.S. “A Laboratory Fatigue Test Program for Steering Components Based on Field Load Data,” SAE Tech. Paper No. 740944 Saginaw Steering Gear Div., General Motors Corp. 1974
- Maroney, G.E. King, R.K. “Two Practical Approaches to Minimize Fatigue Test Time” SAE Tech. Paper No. 770542 Fluid Power Research Ctenter, Oklahoma State University 1977