Nanobeam Mechanics: Elasticity, Strength, and Toughness of Nanorods and Nanotubes

摘要: The Young's modulus, strength, and toughness of nanostructures are important to proposed applications ranging from nanocomposites probe microscopy, yet there is little direct knowledge these key mechanical properties. Atomic force microscopy was used determine the properties individual, structurally isolated silicon carbide (SiC) nanorods (NRs) multiwall carbon nanotubes (MWNTs) that were pinned at one end molybdenum disulfide surfaces. bending measured versus displacement along unpinned lengths. MWNTs about two times as stiff SiC NRs. Continued NRs ultimately led fracture, whereas exhibited an interesting elastic buckling process. strengths substantially greater than those found previously for larger structures, they approach theoretical values. Because buckling, ultimate stiffer less NRs, although represent a uniquely tough, energy-absorbing material.