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Prediction of Design Allowables for Fatigue of Polymer Matrix Composites using Reliability Methods / eingereicht von Chi Nghia Chung
AutorInnenChung, Chi Nghia
Beurteiler / BeurteilerinMajor, Zoltan
ErschienenLinz, 2018
Umfang121 Blätter : Illustrationen
HochschulschriftUniversität Linz, Masterarbeit, 2018
Schlagwörter (DE)Ermüdung von Carbonfaser verstärkten Verbundwerkstoffen / Vorhersagemodell / CFRP
Schlagwörter (EN)fatigue of carbon fiber reinforced composites / prediction model /design allowables / CFRP
Schlagwörter (GND)Kohlenstofffaserverstärkter Kohlenstoffwerkstoff / Kunststoff / Mechanische Eigenschaft / Dauerschwingfestigkeit
URNurn:nbn:at:at-ubl:1-21615 Persistent Identifier (URN)
 Das Werk ist gemäß den "Hinweisen für BenützerInnen" verfügbar
Prediction of Design Allowables for Fatigue of Polymer Matrix Composites using Reliability Methods [7.18 mb]
Zusammenfassung (Englisch)

Carbon fiber reinforced polymers (CFRP) have superb multifunctional properties at simultaneously low specific weight. The mechanical properties are massive dependent on the type of carbon fiber, the matrix material, the number of layers and the orientation of the reinforcing fibers, but also from the manufacturing process. Depending on the compound, CFRPs can achieve high stiffnesses and strengths, which can even surpass those material properties of alloyed steels. Due to these properties, they are often use in demanding engineering applications (aerospace). This work examines the fatigue strength of continuously, carbon fiber reinforced plastics. Cyclically loaded components have only a limited durability, so it is important to carry out a lifetime assessment (by means of calculations, tests, simulations ...) of critical components, which allows an estimation of the durability. Experimental investigations in this field are both cost-intensive and time-intensive. For this reason, the state of the art is to simulate the fatigue strength of components with various commercially available tools. Exactly these strength values of the fiber-polymer-composite are often overestimated, because they are idealized values. No inherent imperfections such as for example voids or delamination of fiber and matrix are considered. In order to obtain a usable material model, the models have to be calibrated afterwards or a sufficient safety factor must be included. Measurement values are again necessary for the calibration. However, these tests are carried out with standardized specimens and not with the component itself. Nevertheless, fatigue data must also be acquired during this operation. The objective of this scientific work is to shorten or even partly replace this process by means of mathematics and statistics. On the basis of a semi-empirical approach, the fatigue strength will be predicted.

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