Fatigue Crack Propagation Monitoring by Acoustic Emission Signal Analysis

Abstract

The aim of this work is to analyse the mechanical response of the masonry specimens under long-term action by means of cyclic tests. To this end laboratory tests were carried out at the Non-Destructive Testing Laboratory of the Politecnico di Torino. The Acoustic Emission technique was employed to assess the damage evolution, and the mechanical properties decay in order to evaluate the extent and the evolution of micro and macro-cracking due to cyclic action until structural collapse in masonry blocks and mortar layers.

Damage process of concrete subjected to coupling fatigue load and freeze/thaw cycles

“…Acoustic emission (AE) is one of the common techniques to monitor the microcrack growth. Lots of studies have been performed on the growth of microcrack inside the concrete by AE technique subjected to F-T cycles [9][10][11][12][13][14][15], as well as to fatigue loading [7,[16][17][18][19][20][21][22][23][24], focusing on the real-time monitoring of microcracks or quantifying damage. Whereas AE research reports on damage evolution due to coupling actions of fatigue load and F-T cycles are rare.…”

Analysis of failure mechanisms in fatigue test of reinforced concrete beam utilizing acoustic emission

“…The durability of reinforced masonry walls through fatigue cycles had been studied by [5]. An experimental analysis on two different sets of reinforced masonry walls under fatigue loading had been carried out in their study.…”

“…A set of stress ratio consisting of 0.6, 0.65, 0.7, 0.8 and 0.9 were used for plain concrete specimens while 0.7, 0.8 and 0.9 were used for fibre reinforced concrete by [9] in their study. While study done by [5] had chosen 0.5 stress ratio of the maximum stress to be carried out on brickwork wall specimens.…”

Acoustic emission detection of fatigue cracks in wind turbine blades based on blind deconvolution separation

“…3 Since the 1970s, acoustic emission (AE) monitoring has been considered a prime non-destructive evaluation approach for the detection and monitoring of fatigue crack propagation processes. 4,5 In AE monitoring, surface-mounted piezoelectric sensors detect the origin of elastic stress waves (the source of AEs) within a structure, which usually pertain to microscopic structural changes in the material. The occurrence of energy release is generally caused by some outside loading of the structure, which may consist of some applied fatigue load to a specimen in the laboratory.…”