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- W2912597148 abstract "Conventional drilling is the most common machining process done on carbon fibre reinforced polymers (CFRP). However, the effect of machining-induced damage on the mechanical performance and reliability of structural composite parts is not fully understood yet. Therefore, this study contributes by a detailed investigation of the open hole bending (OHB) fatigue behaviour of quasi-isotropic CFRP T800S/M21 under consideration of the machining quality. Holes in different qualities were generated with new and worn-off tools. Afterwards, the effect of machining quality on stiffness degradation was analysed in OHB fatigue tests up to 107 cycles. Typical failure modes in dependence of the loading level are reported and discussed with respect to the fatigue life data and the presence of drilling induced delamination. Comprehensive ex-situ analysis by computed tomography were performed in order to characterise both, the fatigue behaviour and its relation to machining caused delamination damage. The results reveal a negative impact of machining defects on lifetime in the early stage of fatigue, whereas this effect vanishes for high levels of stiffness degradation. Several indicators for the promotion of fatigue crack propagation due to pre-damage after the drilling process are identified for moderate flexural loading situations." @default.
- W2912597148 created "2019-02-21" @default.
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- W2912597148 date "2019-05-01" @default.
- W2912597148 modified "2023-09-23" @default.
- W2912597148 title "Effect of drilling-induced damage on the open hole flexural fatigue of carbon/epoxy composites" @default.
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- W2912597148 doi "https://doi.org/10.1016/j.compstruct.2019.02.025" @default.
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