Development of a correlation to estimate the fatigue strength for steels based on low-cost tests
Abstract
Fatigue cracking in metallic materials occurs mainly due to the effect of cyclic stresses and their variation of magnitude over time. To evaluate the fatigue strength based on S-N curves, many tests are needed, which require a lot of time and incur high costs. For this research, several tests were conducted on examples of high-strength steel to determine their mechanical properties, chemical composition and fatigue. It was found that (Charpy V Notch) CVN impact toughness, the percentage of alloying elements and the mechanical properties of the tension test show a positive lineal effect in relation to the fatigue strength of the materials evaluated. Finally, a correlation was found that showed a very good fit between the experimental fatigue data and the predicted values. The correlation, based on Charpy impact energy tests, the relation to the yield stress, the ultimate stress, and the hardness of the material, allows one to predict resistance to fatigue at a low cost.
References
Atkinson H & Anderson C. (2003. Estimation of the Maximum Inclusion in Clean Steels and the Relationship with Mechanical Properties, Dept. of Mechanical Engineering, University of Sheffield, Sheffield, South Yorkshire, England.
Di Schino and Kenny J.M. (2003). Grain size dependence of the fatigue behavior of a ultrafine – grained AISI 304 stainless steel, Materials Letters, 57, 3182–3185.
Dowling, N.E.J. (1998). Integral Estimations for Cracks in Infinite Bodies, Eng. Fracture Mechanic. Vol 1, Pages 1 – 8. .
Juvonen, P. (2004). Effects of non – metallic inclusions on fatigue properties of Calcium Treated Steels, Helsinki University of Technology, Espoo, Finland,10th of December.
Lampman, S., Davidson, G. & Reidenbach, F. (1996). Asm Handbook, Vol 19, Fatigue and Fracture, chapter Fatigue Crack Nucleation and Microstructure. 1996.
Smith, S., Newman, J. & Piascik, R. (2003). Simulation of Fatigue Crack Initiation at Corrosion Pits With EDM Notches, NASA, March 2003.
Subramanya, V., Padmanabhan, K. & Jaeger, G. (2000). On the fatigue crack growth behavior of two ferrite–pearlite microalloyed steels, materials Letters, 46, 185 – 188.
Takuhiro, M. (2007). Method for the evaluation of mode I fatigue crack growth rate of prestrained materials, Department of Mechanical Engineering Science, Kyushu University, Motooka, Japan.
Yang, Z. & Zhang, J.M. (2004).The fatigue behaviors of zero-inclusion and commercial 42CrMo steels in the super-long fatigue life regime, Acta Materialia, 52, 5235–5241.
Vormwald M & Seeger T, Crack Initiation Life Predictions Based on Elastic-Plastic Fracture Mechanics of Short Cracks, 1998.
AISI SAE, “AMERICAN INSTITUTE STEEL AND IRON & SOCIETY FOR AUTOMOTIVE ENGINEER AISI SAE”.
ASTM E415 “Standard Test Method for Atomic Emission Vacuum Spectrometric Analysis of Carbon and Low-Alloy Steel” 2008.
ASTM A370 “Standard Test Methods and Definitions for Mechanical Testing of Steel Products”, 2010.
ASTM E 3 “Standard Guide for Preparation of Metallographic Specimens”, 2007.
ASTM E 45 “Standard Test Methods for Determining the Inclusion Content of Steel”, 2005.
ASTM E112 “Standard Test Methods for Determining Average Grain Size”, 2004.
ASTM E466 “Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials”, 2007.
ASTM E468 “Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials”, 2004.
Downloads
