1. Robert A. W. Carleton Strength of Materials Laboratory, Columbia University, 500 W 120th St., 161 Engineering Terrace, New York, NY 10027, USA.
2. Oak Ridge National Laboratory, 1 Bethel Valley Road, Building 4500S, Room S150, Oak Ridge, TN 37831, USA.
3. University of Delaware, 360A DuPont Hall, Newark, DE 19716, USA.