Abstract
Square-heating thermography was used to predict the depth of glass fiber reinforced plastic (GFRP) flat-bottom holes during its cooling period. Four methods were proposed for depth prediction using a specified characteristic peak time. Square-heating thermography cooling theory was analyzed using numerical methods, the linear relationship between the logarithmic characteristic time and logarithmic depth of the GFRP’s flat-bottom holes was obtained, and the slope and intercept of the linear curve were mainly related to the thermal diffusivity and the heating time. Finally, the flat-bottom hole depth was predicted using experimental cooling data from GFRP samples.
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