A multistable mechanism to detect thermal limits for structural health monitoring (SHM)

Pengcheng Jiao; Kai Lu; Hassene Hasni; Amir H. Alavi; Adam M. Al-Ansari; Nizar Lajnef

doi:10.1117/12.2513389

27 March 2019 A multistable mechanism to detect thermal limits for structural health monitoring (SHM)

Pengcheng Jiao, Kai Lu, Hassene Hasni, Amir H. Alavi, Adam M. Al-Ansari, Nizar Lajnef

Proceedings Volume 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019; 109700Y (2019) https://doi.org/10.1117/12.2513389
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

This study proposes a novel multistable mechanism to detect thermal limits though harvesting energy from thermally induced deformation. A detecting device is developed consisting of a bilaterally constrained beam equipped with a piezoelectric polyvinylidene fluoride (PVDF) transducer. Under thermally induced displacement, the bilaterally confined beam is buckled. The post-buckling response is deployed to convert low-rate and low-frequency excitations into high-rate motions. The attached PVDF transducer harvests the induced energy and converts it to electrical signals, which are later used to measure the thermal limits. The efficiency of the proposed method was verified through a numerical study on a prestressed concrete bridge. To this aim, finite element simulations were conducted to obtain the thermally induced deformation of the bridge members between the deck and girder. In addition, an experimental study was carried out on a 3D printed measuring device to simulate the thermal loading of bridge. In this phase, the correlation between the electrical signals generated by the PVDF film and the corresponding deck-girder displacement was investigated. Based on the results, the proposed method effectively measures the mechanical response of concrete bridges under thermal loading.

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Citation Download Citation

Pengcheng Jiao, Kai Lu, Hassene Hasni, Amir H. Alavi, Adam M. Al-Ansari, and Nizar Lajnef "A multistable mechanism to detect thermal limits for structural health monitoring (SHM)", Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 109700Y (27 March 2019); https://doi.org/10.1117/12.2513389

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