The Acoustic Emission Method Implementation Proposition to Confirm the Presence and Assessment of Reinforcement Quality and Strength of Fiber–Cement Composites

Autor: Anna Adamczak-Bugno, Aleksandra Krampikowska
Rok vydání: 2020
Předmět:
k-means algorithm
0211 other engineering and technologies
02 engineering and technology
lcsh:Technology
Signal
Article
Computer Science::Hardware Architecture
Wavelet
Quality (physics)
fiber composites
Flexural strength
021105 building & construction
General Materials Science
Fiber
lcsh:Microscopy
Reinforcement
Computer Science::Cryptography and Security
lcsh:QC120-168.85
lcsh:QH201-278.5
lcsh:T
business.industry
wavelet analysis
Structural engineering
cement–fiber boards
021001 nanoscience & nanotechnology
Microstructure
Acoustic emission
lcsh:TA1-2040
Environmental science
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
business
lcsh:TK1-9971
acoustic emission method
Zdroj: Materials
Materials, Vol 13, Iss 2966, p 2966 (2020)
Volume 13
Issue 13
ISSN: 1996-1944
DOI: 10.3390/ma13132966
Popis: This article proposes to use the acoustic emission (AE) method to evaluate the degree of change in the mechanical parameters of fiber&ndash
cement boards. The research was undertaken after a literature review, due to the lack of a methodology that would allow nondestructive assessment of the strength of cement&ndash
fiber elements. The tests covered the components cut out from a popular type of board available on the construction market. The samples were subjected to environmental (soaking in water, cyclic freezing&ndash
thawing) and exceptional (burning with fire and exposure to high temperature) factors, and then to three-point bending strength tests. The adopted conditions correspond to the actual working environment of the boards. When applying the external load, AE signals were generated, which were then grouped into classes, and initially assigned to specific processes occurring in the material. The frequencies occurring over time for the tested samples were also analysed, and microscopic observations were made to confirm the suppositions based on the first part of the tests. Comparing the results obtained from a group of samples subjected to environmental and exceptional actions, significant differences were noted between them, which included the types of recorded signal class, the frequency of events, and the construction of the microstructure. The degradation of the structure, associated with damage to the fibers or their complete destruction, results in the generation under load of AE signals that indicate the uncontrolled development of scratches, and a decrease in the frequency of these events. According to the authors, the methodology used allows the control of cement&ndash
fiber boards in use. The registration and analysis of active processes under the effect of payloads makes it possible to distinguish mechanisms occurring inside the structure of the elements, and to formulate a quick response to the situation when the signals indicate a decrease in the strength of the boards.
Databáze: OpenAIRE
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