Journal
COMPOSITE STRUCTURES
Volume 244, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.112255
Keywords
Organic Matrix Composites (OMC); Textile composite; High temperature fatigue; Micro-Computed Tomography (mu-CT); Digital Image Correlation (DIC); MVK-14
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Funding
- French Government program Investissements d'Avenir (EQUIPEX GAP) [ANR-11-EQPX-0018]
- French Government program Investissements d'Avenir (LABEX INTERACTIFS) [ANR-11LABX-0017-01]
- Nouvelle-Aquitaine (France)
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This paper focuses on the experimental high temperature fatigue of Carbon/polyimide 8-harness satin woven composite materials. Traction-traction (R = 0.1) fatigue tests at 250 degrees C are carried out on Carbon/polyimide [45](6) 8-harness satin woven composites under three different environments (air, 2 bar N-2, 2 bar O-2). Part I is specifically devoted to image based damage characterization by employment of Digital Image Correlation (DIC) and Micro-Computed Tomography (mu-CT) techniques. For the used samples, intra tow matrix cracks along fibres on the external plies are the first damage form at the ply-scale. Damage evolution on the sample surface can be followed during the test (in situ) by using 2D DIC. Moreover, fatigue tests are periodically interrupted to perform mu-CT scans to characterize and quantify the damage in the volume of the samples. The obtained results prove that the damage assessment methods presented in this work are suitable for environmentally-assisted fatigue tests on composite materials.
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