アルミニウム合金5083-Oの安定破壊過程のフラクトグラフィ的検討

概要

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The elastic-plastic fracture toughness, J_<Ic>, and the stable crack growth characteristics of an aluminum alloy, 5038-O, were evaluated using center cracked tension specimens. To investigate growth and coalescence of voids, a fractographic approach was attempted. The results obtained are as follows: (1) The critical stretched zone width, SZW_c, becomes constant regardless of the specimen thickness, B, and the initial crack length, a_0, and it agrees with the SZW_c obtained using compact (CT) specimens. So, the J_<Ic> value determined using a subcritical stretched zone width, SZW, versus J blunting line is identical to the J_<Ic> of CT specimens. (2) The relation between the net section stress, σ_lt;netgt;, and the crack extension, Δa, is not influenced by B nor by a_0. (3) Regardless of the macroscopic fracture modes (the flat fracture or the slant fracture), the stable crack growth preceeds in the midthickness of the specimen.
社団法人日本材料学会の論文
1983-12-15