Tension–compression anisotropy of in-plane elastic modulus for pyrolytic carbon

✍ Scribed by Todd S. Gross; Khanh Nguyen; Michael Buck; Nikolay Timoshchuk; Igor I. Tsukrov; Boris Reznik; Romana Piat; Thomas Böhlke

• Book ID: 104009484
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 519 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2011.01.012

✦ Synopsis

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 À30.2 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 m 12 = 0.35 (compression), m 23 = 0.16 (tension), 0.22 (compression), and m 21 = 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.