Strength of Materials

, Volume 27, Issue 8, pp 427–433 | Cite as

Energy method of longevity calculation under an irregular loading. Report 2. Longevity under programmed block loading

  • P. A. Fomichev
Scientific-Technical Division

Abstract

A method of calculating longevity to macrocrack development under a programmed loading in the form of a block repeated many times to failure is proposed. Relationships are derived for calculation of longevity under blocks with stepwise variation in stress amplitude, and also blocks assigned by the probability-distribution density of the stress amplitudes and tables of the differential frequency of repetition of peak and average stresses. Consideration of variation in the material's endurance limit under an irregular cyclic loading is demonstrated. It is shown that a specific type of relationships can be derived for the material under investigation with allowance for its kinetic cyclic-strain diagrams. An example of the longevity calculation, which is compared with experimental data for the block loading of steel 40Kh specimens, is cited.

Keywords

Experimental Data Average Stress Cyclic Loading Stress Amplitude Energy Method 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • P. A. Fomichev
    • 1
  1. 1.Khar'kov Aviation InstituteKhar'kovUkraine

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