二段環境下の腐食疲労寿命

概要

論文の詳細を見る
Two-stage corrosion-fatigue life tests in 3% Nacl⇄laboratory air, 3% Nacl⇄ion exchanged water, and 3%Nacl⇄0.5%Nacl conditions were performed under torsional losd, and the results were discussed based on the observation of cracks on the axial section of test pieces. The fillowing conclusions were drawn: (1) For the test of 3%nacl→laboratory air, the fatige life was reduced remarlably and the total number of stress cycles to failure became shorter than for the continuous 3%nNacl condition. A similar tendency was obtained for the tests of 3%Nacl→ion exchanged water, and 3%Nacl→0.5%Nacl. However, the reduction of fatigue life was sligth because the damage in the first stage was not so severe as that for the test of 3%Nacl→laboratory air. (2) For the revers tests, i.e. laboratory air→3%Nacl, ion exchaged water →3%Nacl, and 0.5%Nacl→3%Nacl, the fatigue lives followed Miner's law. (3) After the corrosion environment was changed to less corrosive one, a few cracks among many short cracks having appeared in the first stage grew acceleratedly and led to a shorter life. For the reverse case, most of the cracks propagated in the second stage, and the life was predictable by the Miner's law.
社団法人日本材料学会の論文
1985-10-15