Experimental study of guided waves propagation characteristics under the changing temperatures

Abstract

Structural Health Monitoring (SHM) plays an important role in ensuring the safe use of aerospace, architecture and other fields. At present, SHM based on piezoelectric and guided waves is a hot spot for real-time monitoring and nondestructive testing. However, the effect of environmental temperatures may mask the signal changes caused by damage and lead to failure of guided wave SHM methods. In this paper, the influence mechanism of the changing temperatures on the propagation characteristics of the guided wave is analyzed. Piezoelectric constants changed with the changing temperatures due to the amplitude variation of the guided wave with the changing temperatures. The effect of temperature on material properties of the plate structures will result in the influence of the guided wave propagation speed. An experiment is performed to study the propagation characteristics of the guided wave on an aluminium plate under changing temperatures. The experimental results indicate that the temperature can change the guide wave amplitude and velocity. At the same time, the temperature effect has the same variation trend at different frequencies, and the slopes of the linear fitting of the propagation characteristics of guided waves with the changing temperatures are also almost consistent.

Confluence Effect of Debris-Filled Damage and Temperature Variations on Guided-Wave Ultrasonic Testing (GWUT)

“…The signal's theoretical time of flight (ToF) is computed using the group velocity and the actuator-sensor distance. Experimentally, the excitation signal is cross-correlated with the response signal captured by the PZT3 sensor to obtain the ToF of the signal using Equation (19). Figure 7 shows the cross-correlation between the excitation and captured response signals.…”

“…It has been successfully used for the detection and localisation of various damages in structures [9,[15][16][17][18]. The effect of environmental and operational conditions on the ultrasonic guided wave, Processes 2024, 12, 957 2 of 20 especially temperature, has been well studied [19,20]. However, the influence of debrisfilled damage cum temperature variation on the guided wave has not been studied.…”

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

“…Contrary to this, both modes attribute to leaky wave in the case of plate–soil interface. Although lamb wave propagates at high velocity, it is susceptible to the effects of ambient noise, low-structural vibration and temperature, which harden the ease of damage identification and interpretations [ 67 ]. In pipe diagnosis and at low frequency, the longitudinal, L; torsional, T; and flexural waves, F, are dominant [ 24 , 28 , 68 , 69 ].…”

“…Its exposure to harsh and varying environmental conditions are suggested to contribute to its deterioration and possible failures. In [ 67 ], temperature variation (−20–60 °C) effect on PZT propagating wave on an aluminium plate was experimentally studied. The wave amplitude and velocity were revealed to be inversely proportional to temperature variation.…”

“…Although it has been shown that temperature variation significantly affects the guided wave mechanical properties and ultrasonic wave parametric features, most of the studies were performed on pristine materials under controllable temperature with a marked range [ 67 , 91 , 128 , 132 , 133 , 134 ].…”