[ASME ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems - Stowe, Vermont, USA (Wednesday 28 September 2016)] Volume 1: Multifunctional Materials; Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Structural Health Monitoring - Estimation of Elastic Parameters of Sandwich Composite Plates Using a Gradient Based Finite Element Model Updating Approach