The GT 2011 conference was organized by Cranfield University, DCMT, at the Defence Academy of the United Kingdom. It was sponsored by the U.S. Army European Research Office, the U.S. Army RDECOM–ARDEC–Benet Laboratories, ASME Pressure Vessels and Piping Division, BAE Systems, KMT Waterjet Systems, United Defense, Rheinmetall, and the Institution of Mechanical Engineers, UK. We extend our thanks to all the authors and reviewers, to the executive and steering committees and to Mrs. Betsy Lawton and Mrs. Lynn Anderson who contributed to a successful and enjoyable conference. Special thanks to Dr. Amer Hameed without whose leadership and persistence this conference would have never materialized. Last, but not least, our thanks to Professor G. E. Otto Widera and Ms. Jessica Bulgrin who made this special journal section possible.