Suppression of Fatigue Crack Growth using repair method with Pulse Electric Current Sintering and Iron Particles

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  • パルス通電焼結と鉄微粒子を用いた簡易補修方法による疲労き裂准展抑制

Abstract

<p>The fatigue life prolonging of an aging advanced building is currently needed. In prolonging fatigue life, it is important to reduce the rate of progress of internal fatigue cracks. The rate of fatigue crack propagation is evaluated by using the effective stress intensity factor which is the ratio of stress at opening and maximum stresses. Based on the Paris law, if the effective stress intensity factor decreases, the rate of progress decreases. Therefore, from the viewpoint of fatigue life prolongation, attention has been paid to a method of reducing the effective stress intensity factor in recent years. In this study, fine particles and pulsed current sintering were used for crack repair. In this research, we applied pulse current sintering to have no particle diameter dependence. At first, a precrack of a test specimen was filled with iron fine particles and pulsed current sintering. In order to confirm the bonding state, the cut surface was observed measured using Scanning Electron Microscope (SEM). After the SEM observation, fatigue test was conducted. These experimental results indicated that our easy repair method prolong fatigue life of precrack.</p>

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