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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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Aircraft structures and engineering structures are always subject to variable amplitude loads. Variable amplitude loads include some kind of loading history ; for example, constant amplitude load, single peak overload and block overload etc. Crack growth under variable amplitude loading exhibits retardation effect.
In this study, the 4 point bending fatigue test was performed by hydrolic servo fatigue testing machine on 7075-T6 Al-alloy.
The retardation effect of overload ratio and numbers of overload cycle was quantitatively studied.
1) Change of retardation effect against increment of overload ratio is more evident when the multiple overload is applied than single overload is done.
2) The number of overload cycle is very important factor about the crack growth retardation effect when the overload ratio is more than 1.75 ; that is not when the overload ratio is less than 1.75.
3) Overload affected zone size increased gradually by increment of crack growth retardation effect.
4) Crack driving force is more greatly reduced when the crack tip branched off two direction than it sloped to one direction.
In this study, the 4 point bending fatigue test was performed by hydrolic servo fatigue testing machine on 7075-T6 Al-alloy.
The retardation effect of overload ratio and numbers of overload cycle was quantitatively studied.
1) Change of retardation effect against increment of overload ratio is more evident when the multiple overload is applied than single overload is done.
2) The number of overload cycle is very important factor about the crack growth retardation effect when the overload ratio is more than 1.75 ; that is not when the overload ratio is less than 1.75.
3) Overload affected zone size increased gradually by increment of crack growth retardation effect.
4) Crack driving force is more greatly reduced when the crack tip branched off two direction than it sloped to one direction.
#Single Overload(單一過荷重)
#Multiple Overload(多重 過荷重)
#Crack growth Retardation(龜裂 成長遲延 現像)
#Load Ratio(荷重比)
#Overload Ratio(O.L.R : 過荷重比)
#Overload Cycle Number(O.L.N : 過荷重 反復回數)
#Overload affected zone size(a<
#SUP>
#*<
#/SUP>
# : 過荷重 影響部)
#Crack Growth Retardation cycle(N<
#SUP>
#*<
#/SUP>
# : 균열 성장지연 사이클)
#Crack Length(龜裂 길이)
#Crack Growth Rate(龜裂成長率)
목차
Abstract
Ⅰ. 序論
Ⅱ. 本論
Ⅲ. 結果 및 考察
Ⅳ. 結論
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