Thermoelastic stress analysis (TSA) is used to study the growth of fatigue damage in single and two<br/>ply, 2 x 2 twill woven composite materials. Test specimens were subjected to a uniaxial tensile cyclic<br/>loading with maximum stresses of 10, 15 and 20% of the ultimate failure stress. The development of<br/>fatigue damage locally within the weft yarns is monitored using high resolution TSA. The specimens<br/>were subsequently inspected using optical microscopy to evaluate the location and extent of cracks.<br/>Cracks were found in the weft fibres, running transverse to the loading direction. It is demonstrated that<br/>the lighter weight fabric is more resilient to damage progression. A signature pattern is identified in the<br/>TSA phase data that indicates the onset and presence of fatigue damage in the composite material
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