| Autor: |
Hopmann, Ch., Marder, J., Kuesters, K., Fischer, K. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2014, Vol. 1593, p444-448, 5p, 1 Black and White Photograph, 3 Graphs |
| Abstrakt: |
Fibre reinforced plastics (FRP) have become the preferred material choice for a wide range of lightweight applications. However, not only the static strength but also the strength and stiffness degradation under cyclical loading conditions have to be predicted for the efficient and reliable design of structures. The phenomenology of the macroscopic damage process of a laminate subjected to cyclical loads is commonly characterized by a first inter-fibre fracture (IFF) and a subsequent accumulation of these IFFs. Finally the laminate fails by one of the macroscopic failure modes named fibre failure (FF), inter-fibre fracture or delamination. Beside these macroscopic failure mechanisms, laminates are inherently characterized by microscopic flaws and cracks in the matrix and at the fibre matrix interface which accumulate especially in transversely loaded plies before the first macroscopic fracture occurs. In well-designed laminates the majority of the fibres are aligned with the loading direction. The fibre longitudinal compressive strength is therefore a critical value, since its inherently lower than the fibre longitudinal tensile strength. The fibre longitudinal compressive strength is influenced by a multitude of factors, such as fibre volume content, fibre and matrix material and also by the micro damage state of a ply. In this paper, the influence of the micro damage state on the fibre longitudinal compressive strength will be discussed. Experimental investigations have been performed to introduce a characteristic micro damage state into a ply by cyclical transverse preloading and quantify the effect of the preloading and the damage state on the fibre longitudinal compressive strength. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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