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Microcrack initiation and acoustic emission during fracture toughness tests of A533B steel

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Abstract

The initiation of microcracks at MnS inclusions during fracture toughness tests of ASTM A533B steel compact tension specimen was detected by an 8-channel acoustic emission recording system. The microcracks were located as far as 7 mm ahead of the precrack front with a large spread of 5 mm above and below the plane of the main crack. Most of the microcracks were found to form before they were engulfed by the plastic zone which was determined by a finite element analysis. Assuming that the material is homogeneous and elastic outside the plastic zone, we estimated that microcracks were formed when the normal tensile stress σz at each inclusion is in the range of 400 to 800 MPa. The estimated stress value exceeds the uniaxial yield strength, σys = 477 MPa of the material because σz near the crack tip could be as large as3σ ys due to the stress triaxiality under plane strain conditions.

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Authors and Affiliations

  1. Department of Metallurgy, Faculty of Engineering, University of Tokyo, Tokyo, Japan

    Takanori Ohira

  2. Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY

    Yih-Hsing Pao (Joseph C. Ford Professor)

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  1. Takanori Ohira
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  2. Yih-Hsing Pao
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Formerly Visiting Scientist in the Department of Theoretical and Applied Mechanics, Cornell University (on leave from Institute of Industrial Science, University of Tokyo, Tokyo, Japan).

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Ohira, T., Pao, YH. Microcrack initiation and acoustic emission during fracture toughness tests of A533B steel. Metall Trans A 17, 843–852 (1986). https://doi.org/10.1007/BF02643860

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  • DOI: https://doi.org/10.1007/BF02643860

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