SUS304/SCM435鋼およびAl 1050アルミニウム合金を用いた繰返しねじり疲労試験におけるき裂伝ぱ挙動

抄録

This paper describes crack propagation behavior of SUS304 stainless steel, SCM435 steel and Al 1050 aluminum alloy under reversed torsion loading. Strain controlled low cycle fatigue and stress controlled high cycle fatigue tests were carried out to make clear the stress/strain dependency on crack propagation behavior using smooth, notched and through hole specimens. Main cracks propagated in the maximum shear direction at high stress/strain ranges and in the principal direction at small stress/strain ranges in SUS304 stainless and SCM435 steels smooth specimens. Main cracks propagated in the maximum shear direction in Al 1050 smooth specimens at all stress/strain ranges. Crack propagation direction was influenced by notches for SUS304 stainless and SCM435 steels but there was no influence of notches for Al 1050.