지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
In case of K_lmax < K_lscc, the corrosion fatigue of high strength steel in O.1N H₂SO₄ solution and 3.5% salt water is as follows.
1. The fatigue life shortens in order of 3.5% salt water and O.1N H₂SO₄ solution.
2. The fatigue crack growth rate in air is obtained as the following equation.
(dc/dN)_?=7.23×10^-?(△K)^?
3. The corrosion fatigue crack growth rate in environment is divided into three regions, that is, First Region, Second Region and Third Region from the small cyclic stress intensity.
4. The formation rate of the active surface on metal is slower than the mechano-chemical reaction rate in First Region. The crack growth rate depends on time and the cyclic stress intensity and is expressed as the following equation.
(dc/dN)=C(△K)^δ
5. The formation rate of the active surface is faster than the mechano-chemical reaction rate in Second Region and the synergistic effect by stress and corrosion becomes slow. In case the. fatigure load is large, we have the critical crack growth rate which is not
related to the cyclic stress intensity. .
6. The corrosion crack growth rate by the mechano-chemical reaction is the same in H₂S0₄ solution and salt water, so Hydrogen accelerates the crack growth.
7. The environment has no effect on the corrosion. fatigue crack growth rate in Third Region.
8. In First Region and Second Region, dimple is observed on the fatigue fracture surface in O.lN H₂SO₄ solution.
9. The striation is observed in any environment as in air in Third Region and its interval approximately coincide with the crack growth rate.
1. The fatigue life shortens in order of 3.5% salt water and O.1N H₂SO₄ solution.
2. The fatigue crack growth rate in air is obtained as the following equation.
(dc/dN)_?=7.23×10^-?(△K)^?
3. The corrosion fatigue crack growth rate in environment is divided into three regions, that is, First Region, Second Region and Third Region from the small cyclic stress intensity.
4. The formation rate of the active surface on metal is slower than the mechano-chemical reaction rate in First Region. The crack growth rate depends on time and the cyclic stress intensity and is expressed as the following equation.
(dc/dN)=C(△K)^δ
5. The formation rate of the active surface is faster than the mechano-chemical reaction rate in Second Region and the synergistic effect by stress and corrosion becomes slow. In case the. fatigure load is large, we have the critical crack growth rate which is not
related to the cyclic stress intensity. .
6. The corrosion crack growth rate by the mechano-chemical reaction is the same in H₂S0₄ solution and salt water, so Hydrogen accelerates the crack growth.
7. The environment has no effect on the corrosion. fatigue crack growth rate in Third Region.
8. In First Region and Second Region, dimple is observed on the fatigue fracture surface in O.lN H₂SO₄ solution.
9. The striation is observed in any environment as in air in Third Region and its interval approximately coincide with the crack growth rate.
목차
Abstract
1.序論
2.材料 및 實驗方法
3.實驗結果 및 考察
4.結論
後記
參考文獻
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