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Depth estimation of surface cracks based on the measurement of crack opening deformation and numerical–experimental iteration

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Abstract

We propose a new method to estimate the depth of a surface crack based on the measurement of crack opening deformation (COD) by using strain gauges. Through finite-element (FE) analysis of several surface cracks with different crack depth, it was found that the distribution of crack depth along the crack line can be approximated by multiplying a certain proportional α to the distribution of COD per unit nominal strain (normalized COD). The strain gauges are cemented just on the crack line and at a reference position, and the normalized CODs are measured under the impact load excited by hammer punching. The surface crack depth is estimated from the normalized COD measurements by a numerical–experimental iteration method based on FE analysis. The estimated distribution of the surface crack depth along the crack line shows good agreement with the shape of a real crack depth.

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Authors and Affiliations

  1. Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-hiroshima, 739-8527, Japan

    Yukio Fujimoto & Jingxia Yue

Authors
  1. Yukio Fujimoto
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  2. Jingxia Yue
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Correspondence to Yukio Fujimoto.

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Fujimoto, Y., Yue, J. Depth estimation of surface cracks based on the measurement of crack opening deformation and numerical–experimental iteration. J Mar Sci Technol 10, 203–210 (2005). https://doi.org/10.1007/s00773-005-0199-9

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  • DOI: https://doi.org/10.1007/s00773-005-0199-9

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