2134/33840
Brian Wisner
Brian
Wisner
K. Mazur
K.
Mazur
V. Perumal
V.
Perumal
Konstantinos Baxevanakis
Konstantinos
Baxevanakis
L. An
L.
An
G. Feng
G.
Feng
A. Kontsos
A.
Kontsos
Acoustic emission signal processing framework to identify fracture in aluminum alloys
Loughborough University
2018
Acoustic emission
Fracture
Microscopy
Mechanical behavior
Aluminum alloys
Mechanical Engineering not elsewhere classified
2018-07-10 13:08:28
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Acoustic_emission_signal_processing_framework_to_identify_fracture_in_aluminum_alloys/9575807
Acoustic emission (AE) is a common nondestructive evaluation tool that has been used to monitor fracture in materials and structures. The direct connection between AE events and their source, however, is difficult because of material, geometry and sensor contributions to the recorded signals. Moreover, the recorded AE activity is affected by several noise sources which further complicate the identification process. This article uses a combination of in situ experiments inside the scanning electron microscope to observe fracture in an aluminum alloy at the time and scale it occurs and a novel AE signal processing framework to identify characteristics that correlate with fracture events. Specifically, a signal processing method is designed to cluster AE activity based on the selection of a subset of features objectively identified by examining their correlation and variance. The identified clusters are then compared to both mechanical and in situ observed
microstructural damage. Results from a set of nanoindentation tests as well as a carefully designed computational model are also presented to validate the conclusions drawn from signal processing.