Fatigue Crack Growth Morphology of 2A12-T4 Aluminum Alloy Plate with Different Thicknesses

ZHANG Sheng; GAO Chao; HE Yu-ting; WU Li-ming; ZHANG Teng

doi:10.11973/jxgccl201606007

Materials and Mechanical Engineering > 2016 > 40(6): 33-36. > DOI: 10.11973/jxgccl201606007

ZHANG Sheng, GAO Chao, HE Yu-ting, WU Li-ming, ZHANG Teng. Fatigue Crack Growth Morphology of 2A12-T4 Aluminum Alloy Plate with Different Thicknesses[J]. Materials and Mechanical Engineering, 2016, 40(6): 33-36. DOI: 10.11973/jxgccl201606007

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Fatigue Crack Growth Morphology of 2A12-T4 Aluminum Alloy Plate with Different Thicknesses

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Received Date: March 30, 2016

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The fatigue crack growth tests were carried out on the single-edge notched specimens of 2A12-T4 aluminum alloy with different thicknesses. The crack front morphology during stable crack growth was observed and fitted by the elliptic equation, and the fitting parameters of elliptic equation were obtained. The mathematical expression between the relative tunnel depth of crack front and the specimen thickness was established. The critical thickness of the crack front morphology transition during growth was predicted and verified by experiments. The results show that with the increase of the specimen thickness, the difference of crack length between the surface layer and the inner layer gradually decreased. The fatigue crack front morphology during stable crack growth changed gradually from "tunnel" shape to a straight line perpendicular to the surface. The relative tunnel depth of crack front decreased with the increase of the specimen thickness, and tended to 0 with the thickness of 31.5 mm. The test results verified the accuracy of the predicted results.
- fatigue crack,
- growth morphology,
- critical thickness,
- 2A12-T4 aluminum alloy

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