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Plastic stress and acoustic emission as predictors of fatigue life

Objectives of this investigation were: first, to utilize a computerized statistical-analysis program to determine relative importance of several parameters as predictors of fatigue life of annealed AISI E4340 steel; secondly, to attempt to relate the phenomenon of acoustic emission to the fatigue characteristics of the steel

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Abstract

The high rate of acoustic emission from AISI E4340 annealed steel when it is stressed can be used to accurately indicate the yield stress. Predictive equations for the fatigue life of AISI E4340 annealed steel have been developed by the use of “Multiple Classification Analysis” and “Stepwise Regression” computer programs based on an experimental study of 175 specimens. The acoustic emission from the fatigue specimens was investigated prior to fatiguing, but no parameter of the emission was found to correlate significantly with fatigue life. The high-rate emission which occurs at yield is found to be useful in determining the value of the yield stress. The value of the stress into the plastic range determined in this manner was defined by both statistical approaches as the best predictor of fatigue life. The fatigue stress level was rejected as a lesser predictor. Surface finish in the range of 90 to 350 μin. was found to have little correlation with fatigue life of this material.

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References

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Authors and Affiliations

  1. E. I. Du Pont de Nemours & Co., Wilmington, Del.

    L. D. Mitchell (Senior Research Engineer)

  2. Dept. of Mechanical Engineering, University of Michigan, Ann Arbor, Mich., USA

    J. R. Frederick (Associate Professor)

Authors
  1. L. D. Mitchell
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  2. J. R. Frederick
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was formerly associated with Dept. of Mechanical Engineering, University of Michigan, Ann Arbor, Mich.

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Mitchell, L.D., Frederick, J.R. Plastic stress and acoustic emission as predictors of fatigue life. Experimental Mechanics 10, 328–332 (1970). https://doi.org/10.1007/BF02320811

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  • DOI: https://doi.org/10.1007/BF02320811

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