Abstract
The theory describing the fatigue mechanism in elasto-plastic material containing pores or inclusions has been developed. An attempt at quantitative determination of the effect of endurance limit reduction by analysis of sizes of plastic zones formed near the inclusions, and their cracking has been done. The geometrical configuration, consisting of a round inclusion from which a nucleating crack emerged, was considered, and the stress intensity factor of such configuration was analysed. Based on a threshold value of ΔK below which crack propagation ceases, the critical value of loading stress was determined. Theoretical results were compared with results from experiments, showing quite good agreement.
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