Experimental investigation on interfacial defect detection for SCCS with conventional and novel contact NDT techniques

Abstract

In order to ensure the mechanical performance and structural safety of steel-concrete composite structures (SCCS), advanced nondestructive testing (NDT) technique for bonding status at steel-concrete interfaces needs to be developed. In this study, the feasibility of multichannel analysis of surface waves (MASW)-based interfacial debonding detection is validated using the contact sensors array. Herein, the multichannel sensor arrays are composed of Piezoceramic Lead Zirconate Titanate (PZT) patches and high-frequency acceleration meters, respectively. For comparison, the impact-response method and impact-transmission method are performed utilizing a force hammer and high-frequency acceleration meters, and corresponding damage imaging algorithms are developed. The applicability of ultrasonic computed tomography (CT) scanning test, scanning impact echo method, ultrasonic tomography technique on interfacial debonding detection is further discussed in depth. Research findings indicate that the developed contact MASW measurement can fully capture the variation of dispersion characteristics of surface waves induced by debonding defects in SCCS. The developed impact-response and impact-transmission methods are suitable for detecting interfacial debondings in different dimensions. Besides, the damage nephogram resolution of impact-response is higher than that of the impact-transmission method. In addition, the practicability of traditional ultrasonic CT scanning tests, scanning impact echo method, and ultrasonic tomography techniques using commercial equipment is investigated. Experimental observations show that classical NDT testing techniques are incapable of effectively identifying the existence of interfacial damage and are unsuitable for NDT tests on SCCS. The research findings in this study clearly exhibit the precision and limitation of various contact NDT techniques and lay a solid foundation for interfacial debonding detection in practical SCCS.

Evaluating impact damage on carbon fiber-reinforced polymer plates utilizing zero-group-velocity Lamb waves

“…Ultrasonic non-destructive testing technology [12] stands out as a widely adopted method in engineering circles, owing to its high sensitivity, long propagation distance, and costeffectiveness [13,14]. Among these methods, Lamb waves, which are ultrasonic guided waves propagating in stress-free plates, excel in long-distance structural damage detection.…”