Residual stress measurement of non-uniform materials based on distributed optical fiber ring array

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Abstract
Residual stress in a part is a key factor in its fatigue life, structural stability, corrosion resistance and other properties. Therefore, accurate measurement of residual stress is essential. The mechanical release method is widely used in residual stress measurement for its high accuracy and mature technology. However, the method assumes that the material is homogeneous, and its accuracy is greatly affected in non-uniform materials. Aiming at the problem of inaccurate residual stress measurement in non-uniform materials, a fiber-optic ring array residual stress measurement method based on high spatial resolution distributed optical fiber measurement technology is proposed. The drilling method is taken as an example. In this method, we arrange the fiber-optic ring array around the hole in the same center to measure the residual stress on the circumference with high spatial resolution. The finite element simulation is used to analyze the influence of the spatial resolution of the fiber sensor, the non-uniform size, position and Young's modulus on the strain distribution and residual stress measurement. It is proved that the method can accurately measure the residual stress and obtain the information of the non-uniform state of the material.

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