1013 Study on improvement of fatigue ΔK_<th> by overload : 1st report ; Experimental investigation of effect of stress ratio

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  • 1013 過大荷重によるき裂材の疲労ΔK_<th>向上に関する研究 : 第1報 : 応力比(S)依存性の実験的検討(OS10-4 供用エネルギー機器の経年変化と健全性評価-疲労き裂-)

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This paper describes the effects of stress ratio on the ΔK_<th> improved by overload. High-tension steel (HT540) and aluminum alloy (A7075) were prepared as test materials. Tensile overload was applied to compact tension specimen, subsequently fatigue tests were carried out at stress ratio S=0.1 or 0.5. The main conclusions are as follows; (1) The value of ΔK_<th> increased with increasing of the tensile overload. (2) The effect of overload on ΔK_<th> did not differ between HT540 and A7075. (3) The improvement ratio of ΔK_<th> S=0.1 was larger than that at S=0.5.

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