The change of the coercive force under fatigue testing of 40X steel specimens

Authors

  • К. В. Вакуленко A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine, Ukraine
  • И. Б. Казак A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine, Ukraine
  • Г. Я. Безлюдько Firm "Special research and development", Ukraine
  • В. Г. Ярещенко A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine, Ukraine
  • Е. И. Елкина Firm "Special research and development", Ukraine

Keywords:

cyclic loading, degradation of structure, submicron fissures, coercive force, surface plastic deformation, healing of defects

Abstract

The influence of cyclic loading and subsequent surface plastic deformation on the change of the coercive force of normalized 40X steel specimens was studied.  It was found that after a cyclic loading of specimens their coercive force increases by 1.5–2 times throughout entire range of loads used, which indicates an increase in the degree of fatigue damage accumulation in steel structure.  In the same time, the most essential increase in the coercive force is noted at the initial phases of relative elongation (deformation) of the specimens (up to 1–1.5%). It was revealed that implementation of a surface plastic deformation of the specimens, which have undergone a preliminary cyclic loading, leads to lowering of values of coercive force and allows to raise their longevity by 2.8–3.4 times. The hypothesis was expressed that this effect is related to a healing of the submicron discontinuity flaws, formed in the material during cyclic loading.  The hypothesis is based on the concepts of the modern material science concerning a healing of defects in the conditions of hydrostatic compression, on a phenomenon of anomalous mass transfer during a pulsed action on the metal, and on a phenomenon of adhesive interaction of solids.

Author Biographies

К. В. Вакуленко, A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine

PhD

И. Б. Казак, A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine

PhD

Г. Я. Безлюдько, Firm "Special research and development"

PhD

В. Г. Ярещенко, A.N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine

PhD

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Published

2015-07-14

Issue

Vol. 18 No. 2 (2015)

Section

Material Science in mechanical engineering

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Copyright (c) 2015 И. Б. Казак, К. В. Вакуленко, Г. Я. Безлюдько, В. Г. Ярещенко, Е. И. Елкина

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