Infrared Image Processing to Guide the Identification of Damage and Dissipative Mechanisms in 3D Layer-to-Layer Woven Composites

This article discusses techniques that aim at facilitating the identification of dissipative mechanisms activated in woven composites under cyclic loadings. The focus is put on the post-processing of thermal measurements acquired during heat build-up experiments, as these are usually used to identify the dissipation sources. The importance of motion compensation pre-processing is demonstrated as it is shown that the latter enhances the quality of the evaluated thermoelastic and dissipation fields. Two specific post-processing techniques are presented in this article. The first one analyzes temperature or thermoelastic fields and searches to detect thermal events associated with the creation of cracks. The second one is based on a Fourier decomposition of thermal fields and aims at highlighting an increased contribution of friction as a dissipation source.

Automated summary

This article discusses techniques for identifying dissipative mechanisms in woven composites under cyclic loadings. The focus is on the post-processing of thermal measurements to identify dissipation sources. The importance of motion compensation pre-processing is demonstrated, and two specific post-processing techniques are presented. One analyzes temperature or thermoelastic fields to detect thermal events associated with crack creation, while the other uses Fourier decomposition of thermal fields to highlight the contribution of friction as a dissipation source.