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TOPOLÁŘ, L. PAZDERA, L. HODULÁKOVÁ, M. MIKULÁŠEK, K.
Original Title
Selected applications of acoustic methods in building materials monitoring
Type
book chapter
Language
English
Original Abstract
Non-destructive acoustic analysis methods, the Impact-echo method as a traditional and the Acoustic Emission method as the non-traditional method for civil engineering, were used for several experiments. The principle of the Impact-echo method is based on analysing an elastic-impulse-induced mechanical wave. The thus generated wave propagates throughout the specimen structure being rebounded by defects located in the specimen bulk or on the surface. The time difference between the emitted wave and the rebounded one is captured by a sensor, which shows the signal waveform. This signal describes transient local vibrations, which are caused by the mechanical wave multiple reflections inside the structure. The dominant frequencies of these vibrations give an account of the condition of the structure, at which the waves are, rebounded. Acoustic Emission is a phenomenon of stress wave radiation caused by a dynamic reconstruction of material’s structure that accompanies processes of deformation and fracture. Crack propagation is one of the macroscopic sources of acoustic emission.
Keywords
acoustic emission method; impact-echo method; civil engineering;
Authors
TOPOLÁŘ, L.; PAZDERA, L.; HODULÁKOVÁ, M.; MIKULÁŠEK, K.
Released
18. 12. 2017
Publisher
Koszalin University of Technology Publishing House
Location
Koszalin
ISBN
978-83-7365-474-7
Book
Research and Modelling in Civil Engineering 2017
Pages from
63
Pages to
80
Pages count
17
BibTex
@inbook{BUT141950, author="Libor {Topolář} and Luboš {Pazdera} and Michaela {Hoduláková} and Karel {Mikulášek}", title="Selected applications of acoustic methods in building materials monitoring", booktitle="Research and Modelling in Civil Engineering 2017", year="2017", publisher="Koszalin University of Technology Publishing House", address="Koszalin", pages="63--80", isbn="978-83-7365-474-7" }