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

作者：Fujimoto, Y^*; Yue, JX

来源：Journal of Marine Science and Technology, 2005, 10(4): 203-210.

DOI：10.1007/s00773-005-0199-9

• crack opening deformation measurement
• crack depth estimation
• finite-element analysis
• strain gauge
• surface crack

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 a 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.

• 出版日期2005