Study of Impact Damage in PVA-ECC Beam under Low-Velocity Impact Loading Using Piezoceramic Transducers and PVDF Thin-Film Transducers.

Baoxin Qi,Hui Qian,Dong Liu,Ing Lim,Devendra Patil,Qingzhao Kong,Mo Li,Gangbing Song

doi:10.3390/s18020671

Abstract

Compared to conventional concrete, polyvinyl alcohol fiber reinforced engineering cementitious composite (PVA-ECC) offers high-strength, ductility, formability, and excellent fatigue resistance. However, impact-induced structural damage is a major concern and has not been previously characterized in PVA-ECC structures. We investigate the damage of PVA-ECC beams under low-velocity impact loading. A series of ball-drop impact tests were performed at different drop weights and heights to simulate various impact energies. The impact results of PVA-ECC beams were compared with mortar beams. A combination of polyvinylidene fluoride (PVDF) thin-film sensors and piezoceramic-based smart aggregate were used for impact monitoring, which included impact initiation and crack evolution. Short-time Fourier transform (STFT) of the signal received by PVDF thin-film sensors was performed to identify impact events, while active-sensing approach was utilized to detect impact-induced crack evolution by the attenuation of a propagated guided wave. Wavelet packet-based energy analysis was performed to quantify failure development under repeated impact tests.

Highlights

Accelerated economic development across the world has increased the need and number of large-scale bay bridges and cross-sea bridges, as well as the ships and shipping routes that travel across these bridges
We investigate the impact damage of polyvinyl alcohol fiber reinforced engineering cementitious composite (PVA-Engineering cementitious composites (ECC)) beams under low-velocity impact loading
The impact events detected by the embedded polyvinylidene fluoride (PVDF) thin-film sensor in the three PVA-ECC beams are shown in Figures 6–8 respectively

Summary

Introduction

Accelerated economic development across the world has increased the need and number of large-scale bay bridges and cross-sea bridges, as well as the ships and shipping routes that travel across these bridges. This has resulted in an increased number of impact collision accidents between ships and bridges which is a great source of economic loss. Research on impact-induced damage have been intensely studied in recent years [13,14,15]: Santosa et al [16] detected the impact damage on fiberglass composite plates based on surface lava wave propagation, and Kim et al [17]

Results

Discussion

Conclusion