寸法の異なる試験片の腐食疲労寿命に及ぼす複数表面き裂分布特性の影響

抄録

Rotary bending fatigue tests were carried out in a sodium chloride aqueous solution by using specimens of 6 and 12 mm diameters in order to investigate the effects of the distributed surface cracks on corrosion fatigue lives or crack growth periods N_p. N_p for specimens of 6 mm diameter decreased with increasing crack density or sum total of crack lengths. On the other hand, N_p for specimens of 12 mm diameter increased with increasing crack density or sum total of crack lengths. These effects of the distributed surface cracks on the crack growth period N_p were explained by taking into account both crack coalescence behaviors and stress relaxation effects at cracked parts.