Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 109, Issue -, Pages 163-170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.03.004
Keywords
Laminate; Mechanical properties; Fatigue; z-pinning
Funding
- German Science Foundation (DFG)
- DFG
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This paper presents an experimental study investigating the static and fatigue tensile properties of unidirectional and quasi-isotropic carbon fiber/epoxy laminates reinforced with rectangular and circular z-pins. All z-pinned laminates showed reduced tensile stiffness and strength compared to unpinned specimens. The insertion of rectangular z-pins that were aligned lengthwise to the fiber direction of a laminate ply was observed to cause minor microstructural damage, such as in-plane fiber waviness. Therefore, the use of rectangular z-pins led to significantly higher tensile stiffness and strength in both unidirectional and quasi-isotropic laminates. Unpinned laminates showed only minor fatigue effects. The insertion of z-pins resulted in a decrease in the fatigue performance of the tested unidirectional and quasi-isotropic laminates. Since this deterioration was primarily caused by the initial knockdown of the static tensile strength of the z-pinned laminates, rectangular z-pins showed superior fatigue performance in both unidirectional and quasi-isotropic laminates.
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