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DIGITAL LIBRARY: CAMX 2023 | ATLANTA, GA | OCTOBER 30-NOVEMBER 2

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Infrared Thermography based Rapid Fatigue Life Characterisation of Advanced Composites

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Title: Infrared Thermography based Rapid Fatigue Life Characterisation of Advanced Composites

Authors: Suhasini Gururaja

DOI: 10.33599/nasampe/c.23.0199

Abstract: A throughline between composite process parameters, composite micro-structural descriptors, and composite structural integrity can be drawn using a recently developed innovative full-field infrared thermography (IR) - based rapid fatigue characterization technique. This technique applies a typical ‘staircase’ cyclic loading with increasing stress amplitude and constant R-ratio to an advanced composite sample while monitoring the spatio-temporal surface temperatures generated during cyclic loading via self-heating. A correlation between these measured stabilized surface temperatures and applied loading can be established to ascertain the inherent damage state of the composite specimen. Under the elastic limit, the surface temperatures are directly related to applied stresses, allowing for direct estimation of stresses, with suitable calibration, using the surface temperature fields using a technique known as the thermoelastic stress effect (TSA). As the load levels increase, resulting in irreversible dissipative processes (or damage events), sustained surface temperature increases can be monitored. The spatio-temporal temperature data measured during fatigue has been used to isolate the dissipative terms using harmonic analysis, yielding a quantifiable damage index. The spatiotemporal surface temperature fields are very sensitive to inherent process-induced defects that often act as damage precursors under cyclic loading. This material-agnostic IR technique yields consistent results for various advanced composites: autoclave/additively manufactured continuous/chopped carbon/glass fiber (unidirectional or multidirectional) thermoset/thermoplastic. Some representative results will be discussed in the paper.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000199

Pages: 7

Price: $14.00

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