Cracks monitoring and characterization by Ba0.64Sr0.36TiO3 flexoelectric strain gradient sensors

Wenbin Huang; Shaorui Yang; Ningyi Zhang; Fuh-Gwo Yuan; Xiaoning Jiang

doi:10.1117/12.2045166

8 March 2014 Cracks monitoring and characterization using Ba_0.64Sr_0.36TiO₃ flexoelectric strain gradient sensors

Wenbin Huang, Shaorui Yang, Ningyi Zhang, Fuh-Gwo Yuan, Xiaoning Jiang

Proceedings Volume 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014; 906119 (2014) https://doi.org/10.1117/12.2045166
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

This paper presents a new method for monitoring and characterizing cracks using Ba_0.64Sr_0.36TiO₃ flexoelectric strain gradient sensors. Firstly, strain gradient field around the mixed mode asymptotic crack tip was analyzed, followed by the derivation of induced flexoelectric polarization in the strain gradient sensors attached in the vicinity of a crack tip. It was found that the flexoelectric polarization of the sensor can be expressed as a function of the stress intensity factors of crack and relative coordinates between the sensor and crack. Given the information of the crack size, further analysis demonstrates that the location of the crack can be traced through the calculation based on flexoelectric outputs of the distributed sensors. A specimen with Mode-I crack was then prepared with two strain gradient sensors (4.7 mm × 0.9 mm × 0.3 mm) attached close to the crack tip to verify the analytical model for detection of cracks. The experimental results yield accurate location of the crack, confirming that flexoelectric strain gradient sensing can be a good avenue for monitoring cracks.

Citation Download Citation

Wenbin Huang, Shaorui Yang, Ningyi Zhang, Fuh-Gwo Yuan, and Xiaoning Jiang "Cracks monitoring and characterization using Ba_0.64Sr_0.36TiO₃ flexoelectric strain gradient sensors", Proc. SPIE 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 906119 (8 March 2014); https://doi.org/10.1117/12.2045166

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