LA-UR-04-2449, Strain Journal, 40(2), 49-58, 2004 Estimation of Electric Charge output for Piezoelectric Energy Harvesting Henry A. Sodano and Daniel J. Inman Center for Intelligent Material Systems and Structures Virginia Polytechnic Institute and State University Blacksburg, VA 24061 Gyuhae Park Engineering Sciences and Applications Weapon Response Group Los Alamos National Laboratory Los Alamos, NM 87545