Tension–compression anisotropy of in-plane elastic modulus for pyrolytic carbon |
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| Authors: | Todd S. Gross,Khanh Nguyen,Michael Buck,Nikolay Timoshchuk,Igor I. Tsukrov,Boris Reznik,Romana Piat,Thomas Bö hlke |
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| Affiliation: | aDepartment of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA;bInstitute of Engineering Mechanics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;cInstitute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany |
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| Abstract: | We used standard strain gage methods to measure the anisotropic elastic constants for a sample of pyrolytic carbon. The in-plane elastic modulus exhibits significant tension–compression anisotropy −30.2 GPa in tension and 18.8 GPa in compression. The out-of-plane compressive modulus is 5.2 GPa and the Poisson’s ratios are ν12 = 0.35 (compression), ν23 = 0.16 (tension), 0.22 (compression), and ν21 = 0.97 (tension). The tension–compression anisotropy is attributed to buckling, puckering, or bending of the graphene sheets in compression versus simple stretching in tension. The in-plane to out-of-plane anisotropy is expected from the microstructural anisotropy. |
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