Rights:
© 2010 American Physical Society (APS). This is the accepted version of the following article: Nukala, Phani K. V. V. & Barai, Pallab & Zapperi, Stefano & Alava, Mikko J. & Simunovic, Srdan. 2010. Fracture roughness in three-dimensional beam lattice systems. Physical Review E. Volume 82, Issue 2. 026103/1-10. ISSN 1539-3755 (printed). DOI: 10.1103/physreve.82.026103, which has been published in final form at http://journals.aps.org/pre/abstract/10.1103/PhysRevE.82.026103.