Embedded and conventional ultrasonic sensors for monitoring acoustic emission during thermal fatigue

Blaine Trujillo; Andrei Zagrai

doi:10.1117/12.2220536

1 April 2016 Embedded and conventional ultrasonic sensors for monitoring acoustic emission during thermal fatigue

Blaine Trujillo, Andrei Zagrai

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 98051K (2016) https://doi.org/10.1117/12.2220536
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

Acoustic emission is widely used for monitoring pressure vessels, pipes, critical infrastructure, as well as land, sea and air vehicles. It is one of dominant approaches to explore material degradation under fatigue and events leading to material fracture. Addressing a recent interest in structural health monitoring of space vehicles, a need has emerged to evaluate material deterioration due to thermal fatigue during spacecraft atmospheric reentry. Thermal fatigue experiments were conducted, in which aluminum plates were subjected to localized heating and acoustic emission was monitoring by embedded and conventional acoustic emission sensors positioned at various distances from a heat source. At the same time, surface temperature of aluminum plates was monitored using an IR camera. Acoustic emission counts collected by embedded sensors were compared to counts measured with conventional acoustic emission sensors. Both types of sensors show noticeable increase of acoustic emission activity as localized heating source was applied to aluminum plates. Experimental data demonstrate correlation between temperature increase on the surface of the plates and increase in measured acoustic emission activity. It is concluded that under particular conditions, embedded piezoelectric wafer active sensors can be used for acoustic emission monitoring of thermally-induced structural degradation.

Citation Download Citation

Blaine Trujillo and Andrei Zagrai "Embedded and conventional ultrasonic sensors for monitoring acoustic emission during thermal fatigue", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98051K (1 April 2016); https://doi.org/10.1117/12.2220536

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KEYWORDS

Sensors

Acoustic emission

Aluminum

Infrared cameras

Infrared imaging

Forward looking infrared

Cameras

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