Crack propagation behavior under low-cycle corrosion fatigue of A7003-T6 aluminum alloy.

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  • Ａ７００３‐Ｔ６アルミニウム合金の低サイクル腐食疲労下におけるき裂伝ぱ挙動
  • A7003-T6 アルミニウム ゴウキン ノ テイ サイクル フショク ヒロウ

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Crack propagation behavior has been observed in A7003-T6 aluminum alloy under low cyclic loading with hold time, over the frequency range 4×10-3∼1 Hz, in 3.0% saline solution. From the experimental results, the effect of cyclic frequency on crack propagation rates was found to be exemplified by two different regimes ; one has a positive dependency on the frequency below a critical frequency, fcrit, at which point maximum environmental attack occurs in terms of da/dN, and the other is negative above fcrit. The behavior of crack propagation below fcrit was explained by the concept of stress-assisted dissolution which tends to inhibit mechanical failure by crack blunting and microbranching. The number and depth of secondary cracks occurring under the fracture surface are measured by metallographic examination, and the actual crack tip stress intensity factor was estimated.

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