SUS304Lステンレス鋼のフレッティング疲労き裂進展挙動

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The crack propagation behavior in fretting-fatigue was investigated with type SUS 304L stainless steel. To induce fretting-fatigue the specimen which was pressed by the fretting-pads made of SUS 304 was subjected to the cyclic direct stress. The conditions of the fretting-fatigue tests were the stress amplitude of σ_a=120 MPa, the contact pressures of p=40, 80, and 120 MPa, and the stress ratios of R=-0.33, 0, and 0.33. The unfretting-fatigue tests of p=0 MPa were also carried out for the same values ofσ_a and R so as to compare with the results of the fretting-fatigue tests. The fretting-fatigue crack initiated at the site on the specimen which was in contact with the edge of the fretting-pad, and propagated at the early stage to the direction inclined to the normal of the cyclic stress axis. The effect of the contact pressure on the crack propagation rate da/dN in the fretting-fatigue under R=0 appeared in the short crack region to about 1 mm in crack length. Although the da/dN in the short crack region showed the tendency to increase with increasing p, the da/dN for p=120 MPa was the same as that for p=40 MPa in the cause of the contact of the opposite surfaces of the oblique fretting crack. The effect of the stress ratio on the da/dN in the fretting-fatigue was mainly owing to the existence or inexistence of the crack surface contacting. Under R=-0.33, the heavy contacting occured at the oblique crack surfaces so that the crack propagation was retarded to the long crack region compared with the case of unfretting-fatigue. Under R=0.33, however, since the contacting did not occur, the da/dN in the fretting-fatigue always surpassed that in the unfretting-fatigue.
社団法人日本材料学会の論文
1984-08-15

SUS304Lステンレス鋼のフレッティング疲労き裂進展挙動

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