腐食疲労き裂成長速度と腐食疲労破壊靱性値に及ぼす応力上昇時間,保持時間,下降時間効果

概要

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The effect of stress wave form, that is, fast-slow (t_R<t_D), slow-fast (t_R>t_D), symmetrical (t_R=t_D) wave form on corrosion fatigue crack growth rate was studied, where tR is rising time and t_D is descending time. When t_R is smaller than t_D+t_H, t_D is not so effective on crack growth rate and t_R is much more of a controlling factor. Where t_H is stress holding time, corrosion fatigue fracture toughness is constant independent of t_R, t_H and t_D, and takes the same value of that in air, while corrosion fatigue crack growth rate is remarkably effected by t_R and t_H. So, the effect of stress wave form motivates local corrosion dissolution at the crack tip and accelates crack growth rate, but does not affect material damage so much.
一般社団法人日本機械学会の論文
1988-03-25