塩水腐食した鋼板の疲労強度低下率と切欠き感受性(<小特集>衝撃小特集)

概要

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Plane bending fatigue tests of steel sheet specimens corroded with salt-water were carried out in order to examine the relation between the feature of the corroded surface and the fatigue strength of the corroded specinens. The material used was quenched and tempered spring steel sheet SUP 6(H_V470). The main factors affecting the degradation of fatigue strength due to corrosion were the reduction of sectional area and the increase in surface roughness, as is the case of 0.075%C and 0.15%C hot-rolled steel sheets. The following equation for estimation of the bending fatigue strength σ_<wap> of the corroded specimens, proposed in our previous report, has been ascertained to hold also for a high strength steel such as spring steel SUP 6. σ_<wap>=(Z_C/Z_0)・(1-ηΔd_<max>^<0.4>・σ_<wo> where Z is the section modulus, η=0.45 for 0.075%C steel, 0.65 for 0.15%C steel and 1.1 for SUP 6(H_V 470), and Δd_<max> is the maximum depth of roughness(mm). The value of η incresed as the hardness of steel sheet becaell related to the notch sensitivity of the material.
社団法人日本材料学会の論文
1987-12-15