MAIN

PEOPLE

PUBLICATIONS

OPEN POSITIONS

Structural high-performance composites incorporate continuous carbon, Aramid, UHMWPE fibers, etc. to provide high strength, stiffness, directional properties, light weight, and other functionalities in addition to structural performance. Laminate and woven composites draw their advanced properties directly from the fiber properties. Therefore, increasing the mechanical stiffness and strength of continuous fibers has direct impact on the the performance of composite structures.

Advanced high-performance fibers have been teh subject of intense research for dacades in order to bring their properties to the current state-of-the-art. Further advances hinge upon careful reseach on the relationships between microstructure and properties which is possible via high spatial and temporal resolution experiments at the scale of individual fibers (diameter ~10 microns). This is the focus of our laboratory research that has shed light into the mechanisms that limit the mechanical strength and ductilty of Aramid and high strength carbon fibers. The graphical abstract on the right shows the first of their kind shear strength experiments with individual mono- and co-polymer Aramid fibers, which helped us to explain the mechanism of failure initiation in this class of high performance fibers. Refer to the papers below for more details!

                                                                                                 Related Publications

1. K. Şahin, J. K. Clawson, J. Singletary, I. Chasiotis, “Shear Strength of Homopolymer and Copolymer Aramid Fibers,” Polymer 186, pp. 122034, (2020).

2. K. Şahin, J. K. Clawson, S. Horner, J. Zheng, J. Singletary, A. Pelegri, I. Chasiotis, “Limiting Orientation Effects on Modulus and Strength of Aramid Fibers,” Polymer 140, pp. 96-106, (2018).

3. H. G. Chae, B. A. Newcomb, P. V. Gulgunje, Y. Liu, K. K. Gupta, M. G. Kamath, K. M. Lyons, S. Ghoshal, C. P., L. Giannuzzi, K. Sahin, I. Chasiotis, and S. Kumar “High Strength and High Modulus Carbon Fibers”, Carbon 93, pp. 81-87, (2015).

4. K. Şahin, N.A. Fasanella, P.V. Kolluru, I. Chasiotis, “Mechanical Property Experiments with Ultra-High Strength Micrometer Scale Fibers”, Experimental Mechanics 55 (5) pp. 877-885, (2015).

5. K. Şahin, N.A. Fasanella, I. Chasiotis, K.M. Lyons, B.A. Newcomb, M.G. Kamath, H.G. Chae, S. Kumar, “High strength micron size carbon fibers from polyacrylonitrile–carbon nanotube precursors”, Carbon 77, pp. 442–453 (2014).

6. T. Ozkan, D. Shaddock, D.M. Lipkin, I. Chasiotis, “Mechanical strengthening, stiffening, and oxidation behavior of pentatwinned Cu nanowires at near ambient temperatures”, Materials Research Express 1, pp. 035020-1 – 18, (2014).

7. K. Hanschmidt, T. Tätte, I. Hussainova, M. Part, H. Mändar, K. Roosalu, I. Chasiotis, “Optimization of Mechanical Strength of Titania Microfibers Fabricated by Direct Drawing”, Applied Physics A: Materials Science and Processing 113, pp. 663-671, (2013).

8. T. Ozkan, Q. Chen, and I. Chasiotis, “Interfacial Strength and Fracture Energy of Individual Carbon Nanofibers in Epoxy Matrix as a Function of Surface Conditions”, Composites Science and Technology 72, pp. 965-975, (2012).

9. M. Naraghi, S. Arshad, and I. Chasiotis, “Molecular Orientation and Mechanical Property Size Effects in Electrospun Polyacrylonitrile Nanofibers”, Polymer 52, pp. 1612-1618, (2011).

10. S.N. Arshad, M. Naraghi, and I. Chasiotis, “Strong Carbon Nanofibers from Electrospun Polyacrylonitrile”, Carbon 49, pp. 1710-1719, (2011).

11. T. Ozkan, M. Naraghi, and I. Chasiotis, “Mechanical Properties of Vapor Grown Carbon Nanofibers”, Carbon 48, pp. 239-244, (2010).