Identification of the Thermal Conductance of a hidden barrier from outer thermal data

TL;DR

This paper presents a method to identify hidden interface defects in composite slabs by analyzing thermal data from the accessible surface, using Thin Plate Approximation and FFT filtering to reconstruct interface conductance.

Contribution

It introduces a novel approach combining Thin Plate Approximation and FFT filtering to detect and quantify hidden interface defects from surface thermal measurements.

Findings

Successfully reconstructed simulated interface conductance defects.

Demonstrated effectiveness of the method on thermal data.

Provided a reliable technique for non-invasive defect detection.

Abstract

Hidden defects affecting the interface in a composite slab are evaluated from thermal data collected on the upper side of the specimen. First we restrict the problem to the upper component of the object. Then we investigate heat transfer through the inaccessible interface by means of Thin Plate Approximation. Finally, Fast Fourier Transform is used to filter data. In this way we obtain a reliable reconstruction of simulated flaws in thermal contact conductance corresponding to appreciable defects of the interface.