1. Structural Integrity Group, United Technologies Research Center, East Hartford, CT 06108 (formerly National Research Council Associate, NASA Langley Research Center, Hampton, VA, USA
2. Naval Undersea Warfare Center, Newport, RI 02841, USA
3. Associate. Department of Mechanical Engineering, University of Cincinnati, OH 45221, USA
4. MS 231, NESB, 3B Taylor St, NASA Langley Research Center, Hampton, VA 23681, USA
5. Department of Mechanical Engineering and Aerospace Engineering, Arizona State University, Tempe, AZ 85287, USA