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Open AccessArticle

Experimental Investigations on the Influence of Different Notch Designs on the Pullout Performance of Circumferentially Notched Z-pins

Chair of Lightweight Design and Materials, Department of Mechanical Engineering and Marine Technology, University of Rostock, Albert-Einstein-Str. 2, 18059 Rostock, Germany
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J. Compos. Sci. 2020, 4(2), 67; https://doi.org/10.3390/jcs4020067
Received: 7 May 2020 / Revised: 29 May 2020 / Accepted: 2 June 2020 / Published: 5 June 2020
The results of experimental research on the pullout properties of circumferentially notched z-pins with various notch designs are presented in this paper. Investigations on notched z-pins with four different notch designs—rectangular, circular, triangular, and sinusoidal—inserted into unidirectional (UD) and quasi-isotropic (QI) laminates were carried out in order to assess the influence of notch design and laminate structure on the resulting z-pin pullout properties. It can be shown that the application of circumferential notches at the z-pin surface causes significant increases in pullout forces and consequently, on the resulting pullout energies, regardless of which notch design is considered. The effect of notched z-pins is higher in a quasi-isotropic than in a unidirectional laminate structure. The highest enhancements of the pullout energy were found on quasi-isotropic laminates with circular and sinusoidal notch designs with increases of up to 69%, in comparison to measurements on samples with unnotched z-pins. View Full-Text
Keywords: 3-dimensional reinforcement; bridging mechanisms; circumferentially notched; pullout energy; z-pinning 3-dimensional reinforcement; bridging mechanisms; circumferentially notched; pullout energy; z-pinning
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Knopp, A.; Scharr, G. Experimental Investigations on the Influence of Different Notch Designs on the Pullout Performance of Circumferentially Notched Z-pins. J. Compos. Sci. 2020, 4, 67.

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