薄鋼板構造のプレス曲げＲ部の疲労寿命推定

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タイトル別名
  • Fatigue Life Prediction of Press-Formed Corners on Thin Steel Sheet Structures.
  • ウスコウハン コウゾウ ノ プレス マゲ Rブ ノ ヒロウ ジュミョウ スイテ

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抄録

To study a fatigue life prediction method for press-formed corners in thin steel sheet structures, bending fatigue tests were made on press-formed members. The hardness of the press-formed corner on the member, where a fatigue crack would appear, was measured. The results showed that the hardness is greater than that of a steel sheet as received. On the other hand, the strains on the inner and outer surfaces of the press-formed corner were analyzed by FEM and experiments. The results showed that the press-formed corner is under the combined load of an axial force and a bending moment. To simulate the hardness of the press-formed corner, a smooth specimen was prestrained and the fatigue tests of prestrained specimens were performed under the same combined load condition as the press-formed corner. It was confirmed that the Δε-Nf diagram of the prestrained specimens makes an accurate fatigue life prediction of the press-formed corner on members.

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