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Metallurgical and Materials Transactions A

, Volume 29, Issue 5, pp 1431–1439 | Cite as

A strain energy-based approach to the low-cycle fatigue damage mechanism in a high-strength spring steel

  • D. M. Li
  • W. J. Nam
  • C. S. Lee
Article

Abstract

Low-cycle fatigue tests were conducted using smooth, cylindrical specimens under a strain-controlled, fully reversed condition for a high-strength spring steel heat treated to different strength levels. The variation of the cyclic deformation substructure was observed with a transmission electron microscope (TEM). The results indicate that the average plastic strain energy dissipated per cycle (ΔW ps ) is an important parameter upon which a consistent evaluation of the cyclic stress-strain, the strain-life, and the plastic strain energy-life relationships is made feasible. Furthermore, the total plastic strain energy dissipated prior to failure (W f ), determined on the basis of ΔW ps , is proven to be another important parameter, from the variation of which the extent of local damage accumulation can be evaluated. Confirmed by the results of TEM observations, a strain localization-induced damage mechanism is proposed and discussed.

Keywords

Material Transaction Strain Amplitude Slip Band Plastic Strain Energy Deformation Substructure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1998

Authors and Affiliations

  • D. M. Li
    • 1
  • W. J. Nam
    • 2
  • C. S. Lee
    • 1
  1. 1.the Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohangKorea
  2. 2.the Technical Research LaboratoryPohang Iron and Steel Co. Ltd.PohangKorea

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