Depth estimation of surface cracks based on the measurement of crack opening deformation and numerical–experimental iteration |
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Authors: | Yukio Fujimoto Jingxia Yue |
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Institution: | (1) Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-hiroshima 739-8527, Japan |
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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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Keywords: | Crack opening deformation measurement Crack depth estimation Finite-element analysis Strain gauge Surface crack |
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