コンパクト試験片の圧縮残留応力場の疲労き裂面弾性接触の解析

概要

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Based on the superposition technique, the effect of residual stress on the fatigue crack growth rate has been estimated to be the same as the effect of the applied stress ratio, considering the effect of the crack surface contact. In this paper, a simpler method to analyze the partial crack surface contact is proposed. The changes of the real stress intensity factor in a load cycle on a compact specimen with a welding residual stress field is analyzed numerically. The effect of a notch machined into the compact specimen is also analyzed. The results obtained are as follows; (1) The simpler method with the superposition technique can be applied. (2) Because of the crack surface contact, the real stress intensity factor range is reduced and the real stress ratio becomes is heigher than O in a compressive residual stress field. (3) The real stress intensity facor is kept constant from the onset of the crack surface contact to the complete unloading on the compact specimen. (4) The notch machined into the compact specimen reduces the effect of the partial crack surface contact.
一般社団法人日本機械学会の論文
1989-07-25