研究目的
To quantify the damage thickness of composites (the thickness of air gaps inside composites) through a single-side inspection of pulsed thermography.
研究成果
The proposed method improves the degradation assessment performance by extending damage measurement from two to three dimensions. The thermal reflection coefficient is strongly correlated with defect size, depth, and thickness, enabling the quantification of defect thickness using a single-side pulsed thermographic inspection. The method demonstrated potential with Pearson Correlation Coefficients of 0.75 and 0.85 for block defects and flat-bottom holes, respectively.
研究不足
The performance of the identified models is limited to the produced specimens. Changes in materials or defect shape may influence results. The approach may have limited application on irregular airgaps.
1：Experimental Design and Method Selection:
The study employs pulsed thermography for non-destructive testing of composite materials to estimate damage thickness.
2：Sample Selection and Data Sources:
Three CFRP laminate samples with different types of defects (block defects and flat-bottom holes) were used.
3：List of Experimental Equipment and Materials:
Thermoscope? II pulsed-active thermography system, FLIR SC7000 series infrared radiometer.
4：Experimental Procedures and Operational Workflow:
Samples were inspected using pulsed thermography, with temperature decay data captured and analyzed.
5：Data Analysis Methods:
Nonlinear Least-Squares Fitting (NLSF) method and Nonlinear Finite Impulse Response (NFIR) model were used to analyze the data and establish relationships between thermal reflection coefficient and defect parameters.
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