Title: HYBRID FIBER OPTIC/PIEZOELECTRIC BASED DIAGNOSTIC AND FINITE ELEMENT BASED PROGNOSTIC STRUCTURAL HEALTH MONITORING
Abstract: A hybrid sensing system using fiber optic sensors and piezoelectric actuators has been developed for real-time, in-situ structural health monitoring. Fiber optic (FO) sensors are small, lightweight, chemically resistant, and immune to electromagnetic interference, thus demonstrating high performance in harsh environments. A FO sensor array is used to detect location of impact events using triangulation methods on both metallic and composite structures. The combination of piezoelectric actuators and fiber optic sensors is used to detect damages in both metallic and composite structures under impact loading. Ultrasonic based wave propagation approach along with a technique based on a "damage index (DI)" is used to detect impact damage (matrix damage, fiber breakage, delamination etc.) propagation in both metallic and composite structures. DI is calculated using the square of the measured voltage from mounted PZT sensors at various control points in the frequency range of 0 - 1 MHz. Multi-Scale progressive failure analysis (MS-PFA) based finite element (FE) approach is also performed to simulate impact test. MS-PFA provides detail break down of when, where and what type of damage is present along with percent contribution of different damage types. The overall damage footprint measured using this hybrid sensor network shows good comparison to the FE based approach.
Authors: Harsh Baid, Jonathan Kordell, Michael Cope, Miao Yu, Abhijit Dasgupta and Frank Abdi
Conference: CAMX 2017 –Orlando