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Zeybek, Mehmet Kaan
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01. Izmir Institute of Technology
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2
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15
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7.50
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| Journal | Count |
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| Journal of Materials Engineering and Performance | 1 |
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Article Citation - WoS: 15Citation - Scopus: 15The Effect of Strain Rate on the Compression Behavior of Additively Manufactured Short Carbon Fiber-Reinforced Polyamide Composites With Different Layer Heights, Infill Patterns, and Built Angles(Springer, 2023) Zeybek, Mehmet Kaan; Güden, Mustafa; Taşdemirci, Alper; Güden, Mustafa; Zeybek, Mehmet Kaan; 03.10. Department of Mechanical Engineering; 01. Izmir Institute of Technology; 03. Faculty of EngineeringPrevious studies on the fused deposition modelling (FDM) processed short carbon fiber/Polyamide 6 (PA6) matrix composites and neat PA6 have mostly concentrated on the quasi-static mechanical properties. Present study focused on the strain rate-dependent deformation behavior of a short carbon fiber-reinforced PA6 (Onyx) and neat PA6, produced in different layer heights, infill patterns and built angles. As compared with PA6, Onyx showed a higher compression stress at all strain rates investigated. A layer height of 0.2 mm in PA6 specimens promoted a better bonding between [0/90°] infill layers; hence, a higher flow stress than 0.2 mm layer height specimens, while 0.2 mm layer height induced a higher porosity in Onyx specimens, leading to a lower flow stress. The porosities in Onyx [0/90°] infill specimens were due to the constraining effect of 0/90° fiber layers. Changing infill pattern from a [0/90°] to a concentric one decreased porosity at the same layer height and hence increased the compressive flow stress. The highest compressive strength was found in the specimens with the loading axis 90 and 0° to [0/90°] infill plane. The lowest strength was, however, determined in the specimens with the loading axis 30 and 60o to [0/90°] infill plane in quasi-static loading. However, the specimens with the loading axis of 60, 45, 30 and 0° exhibited a brittle behavior in high strain rate loading (1500 s−1). The specimens with the loading axis of 45° had the lowest fracture stress and strain in the high strain rate loading. This signified the importance of loading angle at high strain rates. Finally, the rate sensitivities of PA6 and Onyx specimens were shown to be similar, showing a matrix dominated deformation. However, the strain rate jump tests indicated a slightly higher rate sensitivity of Onyx specimens at quasi-static strain rates (10−3-10−1 s−1).Master Thesis The Effect of Strain Rate on the Deformation Behavior of Additively Manufactured Short Carbon Fiber Reinforced Polyamide Composites(Izmir Institute of Technology, 2022) Güden, Mustafa; Zeybek, Mehmet Kaan; Güden, Mustafa; 01. Izmir Institute of Technology; 03.10. Department of Mechanical Engineering; 03. Faculty of EngineeringThe compression behavior of Polyamide 6 (PA6- nylon 6) and short carbon fiber reinforced polyamide 6 (Onyx) produced by the Fused Deposition Modelling (FDM) method was investigated at both quasi-static and dynamic strain rates. The effects of layer height, specimen shape and dimensions, build direction and the orientation of the layers on the compression behavior were also determined. The results showed that the addition of short carbon fibers to the PA6 matrix increased the compression strength by 3-4 times and the determined flow stress has a strong correlation with the porosity amount in the specimens. The compression test results showed that cylindrical specimens had slightly higher flow stress than the cubic specimens. The compression tests on the specimens produced with different lengths showed almost no difference regarding stress-strain behavior. Furthermore, the specimens produced with 90 degrees showed the highest elastic modulus and yield strength and the specimens produced with 30 and 60 degrees the lowest modulus and yield strength. The Concentric infill specimens exhibited higher elastic modulus values and flow stresses than Cross raster infill specimens at all strain rates. In the layers of concentric rings, the outer rings prevented the lateral expansion of inner rings, leading to higher flow stresses than the cross raster [0/90] lay-up. The flow stress of both PA6 and Onyx specimens increased with increasing strain rate. The rate sensitivities of PA6 and Onyx specimens were shown to be similar to each other.