For design against fatigue, the importance of the fatigue fracture toughness K//f//c has been proposed and a recent experimental investigation revealed that the fatigue fracture toughness for high strength tempered martenisitic steel was only about half of that of usual fracture toughness. This means that K//f//c, not K//l//c, should be taken into consideration against fatigue design since the critical flaw size in fatigue condition predicted from K//f//c would be one quarter comparing with that in static condition. A very sharp toughness transition of K//f//c is observed at about 123 K ( minus 150 degree C) for this steel, namely K//f//c is drastically reduced within a fairly sharp temperature interval and decreases further with decreasing temperature below FTT. The object of the present investigation is to study much more thoroughly the fatigue crack propagation in 5. 5% Ni steel with special interest for its difference between above and below the FTT.
|出版ステータス||Published - 1978|
|イベント||Fract 1977 $—$ adv in res on the strength and fract of mater, Int Conf on Fract, 4th - Waterloo, Ont, USA|
継続期間: 1977 6 19 → 1977 6 24
|Other||Fract 1977 $—$ adv in res on the strength and fract of mater, Int Conf on Fract, 4th|
|City||Waterloo, Ont, USA|
|Period||77/6/19 → 77/6/24|
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