Frequency analysis in sandwich higher order plates imposing various boundary conditions

Raminnea, Morteza

doi:10.1504/ijhm.2019.098953

Cited by 3 publications

(1 citation statement)

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“…In order to obtain the spectral distribution of the elastic waves generated in the materials, the frequency analysis of the recorded AE signals was performed using the Fourier transformation [25,[33][34][35]. Figure 8 presents a summary of the research results of the frequency spectrum of the generated acoustic waves in individual structures.…”

Section: Analysis Of the Spectrum Distribution Of Ae Waves Depending ...mentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Berdowska

Berdowski

Frederic

2021

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The main aim of the study was to search for the relationship between the anisotropy of the structure of polyfurfuryl alcohol (PFA) -polymer/compressed expanded graphite (CEG)-matrix composites at subsequent stages of the technological process and characteristics of the acoustic emission (AE) descriptors. These composites, obtained after successive technological procedures of impregnation, polymerization, and carbonization, possess different structure, densities, porosity, and other physicochemical properties. In the structures of composites prepared on the basis of CEG, two basic directions can be distinguished: parallel to the bedding plane of graphite sheets and perpendicular to it. The measurements were carried out for the stress acting in these two main directions. The investigation has shown that the AE method enables the detection of anisotropy in the structure of materials. The results of the research show that all four of the acoustic emission descriptors studied in this work are sensitive to the technological stages of these materials on the one hand and their structure anisotropy on the other. Fourier analysis of the recorded spectra provides interesting conclusions about the structural properties of composites as well as a lot of information about the bonding forces between the carbon atoms of which the CEG matrix is composed and the PFA polymer or turbostratic carbon.

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Section: Analysis Of the Spectrum Distribution Of Ae Waves Depending ...mentioning

confidence: 99%