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Available online at Nanotube/matrix interfacial friction and sliding omposites with an amorphous carbon matrix L. Li,a,b J.B. Niu,a Z.H. Xia,a, ⇑ Y.Q. Yangb and J.Y. Liangc aDepartment of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA bSchool of Materials, Northwestern Polytechnic University, Xi’an, People’s Republic of cDepartment of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA Received 14 July 2011; accepted 3 September 2011 Available online 10 September 2011 Interfacial friction and sliding of single and multi walled carbon nanotubes embedded in an amorphous carbon matrix were studied via molecular dynamics simulations. Multi walled carbon nanotubes with 16% interwall sp3 bonding have friction stresses three times larger than single walle notubes or perfect multi walle notubes for the same nominal conditions. With reasing sp3 bond fraction, the interfacial friction strength reases to 20 120 MPa, which is comparable to the strength of a number of tough micron scale ceramic matrix composite systems. Ó 2011 Acta Materialia . Published by Elsevier . s . Keywords: Mechanical properties; Nanocomposites; Molecular dynamics; Simulation Amorphous carbon (a-C) composites orpo- a-C matrix can provide useful insights into designing rating nanosized rein ments are being actively pur- these super-hard/super-tough wear-resistant nanoc