Fatigue characterization of embedded layers in CFR Composites: Fatigue Design 2019, International Conference on Fatigue Design, 8th Edition
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In: Procedia Structural Integrity, Vol. 19, 01.01.2019, p. 370-379.
Research output: Contribution to journal › Conference article › peer-review
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TY - JOUR
T1 - Fatigue characterization of embedded layers in CFR Composites
T2 - Fatigue Design 2019, International Conference on Fatigue Design, 8th Edition
AU - Schneider, Christian
AU - Drvoderic, Matthias
AU - Pinter, Gerald
AU - Schuecker, Clara
AU - Gaier, Christian
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The stress-based approach with experimental S/N curves (stress amplitude vs. number of cycles) is a well-known approach for lifetime prediction of components, also in the composite industry. The problem with this so called "Wöhler" approach is that only final fatal failure of specimen can be described. But for a real definition of end-of-lifetime the identification of failure mechanisms and the corresponding sequence of effects are essential. Besides that for embedded layers, the initiation of first cracks does not lead to failure of the whole specimen. Within this work two different layups with carbon fibre reinforced polymers in UD 90° respectively embedded UD 90° within UD 0° direction was used. Starting from these two layups, a simulation was done for different end-tab-materials and several taper angles to get an overview on the lowest risk factor for breakage at the tab/specimen transition region of the specimen. Regarding the simulation results, specimens were produced and different end tabs were added. Quasi-static as well as fatigue tests were performed and compared based on the calculation with classical laminate theory. Also a comparison between simulation and testing of the crack region for the UD 90° specimen was done. With this work, a base for further variation of specimen geometry was established to monitor the initiation and propagation of (micro-)cracks in the embedded UD 90° layers with different techniques.
AB - The stress-based approach with experimental S/N curves (stress amplitude vs. number of cycles) is a well-known approach for lifetime prediction of components, also in the composite industry. The problem with this so called "Wöhler" approach is that only final fatal failure of specimen can be described. But for a real definition of end-of-lifetime the identification of failure mechanisms and the corresponding sequence of effects are essential. Besides that for embedded layers, the initiation of first cracks does not lead to failure of the whole specimen. Within this work two different layups with carbon fibre reinforced polymers in UD 90° respectively embedded UD 90° within UD 0° direction was used. Starting from these two layups, a simulation was done for different end-tab-materials and several taper angles to get an overview on the lowest risk factor for breakage at the tab/specimen transition region of the specimen. Regarding the simulation results, specimens were produced and different end tabs were added. Quasi-static as well as fatigue tests were performed and compared based on the calculation with classical laminate theory. Also a comparison between simulation and testing of the crack region for the UD 90° specimen was done. With this work, a base for further variation of specimen geometry was established to monitor the initiation and propagation of (micro-)cracks in the embedded UD 90° layers with different techniques.
KW - unidirectional
KW - transvers
KW - cross ply
KW - embedded
KW - simulation
KW - Puck criterion
KW - tabs
KW - taper angle
KW - CFRP
KW - tensile test
KW - lifetime prediction
KW - fatigue
KW - Wöhler approach
UR - http://www.scopus.com/inward/record.url?scp=85081581351&partnerID=8YFLogxK
U2 - 10.1016/j.prostr.2019.12.040
DO - 10.1016/j.prostr.2019.12.040
M3 - Conference article
VL - 19
SP - 370
EP - 379
JO - Procedia Structural Integrity
JF - Procedia Structural Integrity
SN - 2452-3216
ER -