アルミニウム合金におけるモードＩＩ疲れき裂進展機構とその材料依存性

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  • Mode II fatigue crack growth mechanism and its dependency on material in aluminum alloys.
  • アルミニウム ゴウキン ニ オケル モード 2 ヒロウ キレツ シンテン キコ

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The behavior of mode II fatigue crack growth and its mechanism have been investigated on 2017-T3, 7075-T6, 7075-T651 aluminum alloys and 7N01-T4 aluminum alloy weldments by using a four-point-shear-loading method. In the aluminium alloys tested, the da/dN-ΔKII relation and ΔKII-threshold for mode II fatigue crack growth were found to be very material-sensitive, while da/dN-ΔKIeff relation for mode I growth was rather material-insensitive as is well known.<br>Observation of the deformation around a growing crack tip has been made on the repricas taken at the successive stages-minimum load, maximum load, minimum load-in one load cycle. Two types of mechanisms of mode II fatigue crack growth have been proposed based on the observed results. In 2017-T3 and 7N01-T4 base metal, HAZ and weld metal, a mode II fatigue crack grows due to the alternating shear slip mechanism at the crack tip, and in 7075-T6 shear-induced-decohesion takes place in addition to the alternating shear slip. The cyclic crack tip shear displacement Δ(CTSD)p on the boundary of the cyclic plastic region measured on the repricas agreed well with Δ(CTSD) calculated from BCS theory in all the materials tested. It has been confirmed that the fractographical features observed support the proposed mechanisms of mode II fatigue crack growth.

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  • 材料

    材料 34 (385), 1174-1179, 1985

    公益社団法人 日本材料学会

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