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Digital Image Correlation Using Specific Shape Function for Stress Intensity Factor Measurement

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Abstract

The stress intensity factor (SIF) is a critical parameter associated with the fracture behaviour of materials. In this paper, we select the displacement function around a crack tip as the shape function of the digital image correlation (DIC), which makes it possible to directly calculate the SIF by the correlation scheme. Moreover, we use a non-rectangular subset, which can reduce the influence of plastic deformation and crack width on the DIC measurement accuracy. We measured the SIF of a mode I crack in a super-hard aluminium alloy specimen to verify the performance of the proposed method. Our experimental results show that a DIC with a specific shape function can be used to accurately and efficiently calculate the SIF. Furthermore, we also present a practical application of our proposed method for determining the SIF, crack propagation angle and crack tip displacement.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 11502166 and No. 11372222).

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Authors and Affiliations

  1. School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China

    Chunhua Ren & Hongwei Ji

  2. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, 300134, China

    Jia Yang, Xiaochuan Zhang & Hongwei Ji

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  1. Chunhua Ren
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  2. Jia Yang
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  3. Xiaochuan Zhang
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  4. Hongwei Ji
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Correspondence to Hongwei Ji.

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Ren, C., Yang, J., Zhang, X. et al. Digital Image Correlation Using Specific Shape Function for Stress Intensity Factor Measurement. Trans. Tianjin Univ. 23, 157–162 (2017). https://doi.org/10.1007/s12209-017-0041-6

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  • DOI: https://doi.org/10.1007/s12209-017-0041-6

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