Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing

Acoustic emission, the detection of signals during deformation, is a frequently used method for the study of local deformation processes occurring in heterogeneous polymer systems. Most of these processes result in the evolution of elastic waves which can be detected by appropriate sensors. The anal...

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Autores principales: Milán Ferdinánd, Róbert Várdai, János Móczó, Béla Pukánszky
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Publicado: MDPI AG 2021
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spelling oai:doaj.org-article:d9ab4c4c1b8f4f438ad9e829581d779a2021-11-25T18:48:26ZDeformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing10.3390/polym132239312073-4360https://doaj.org/article/d9ab4c4c1b8f4f438ad9e829581d779a2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/3931https://doaj.org/toc/2073-4360Acoustic emission, the detection of signals during deformation, is a frequently used method for the study of local deformation processes occurring in heterogeneous polymer systems. Most of these processes result in the evolution of elastic waves which can be detected by appropriate sensors. The analysis of several parameters characterizing the waves offers valuable information about the possible deformation mechanism. The acoustic emission testing of composites may yield very different number of signals from a few hundred to more than 100,000. This latter was proved to be affected mainly by particle size, interfacial adhesion and composition, but other factors, such as matrix modulus and specimen size, also influence it. Local deformation processes are claimed to have a strong effect on macroscopic properties. Indeed, a close correlation was found between the initiation stress of the dominating particle related process derived from acoustic emission testing and the tensile strength in both polypropylene (PP) and poly(lactic acid) (PLA) composites. However, in polyamide (PA)-based heterogeneous polymer systems, deformations related to the matrix dominated composite properties. Besides forecasting failure, the method makes possible the determination of the inherent strength of lignocellulosic fibers being around 40 MPa as well as the quantitative estimation of adhesion strength for composites in which interactions are created by mechanisms other than secondary forces. The proposed approach based on acoustic emission testing proved that in PP/CaCO<sub>3</sub> composites, the strength of adhesion can be increased by ten times from about 100 mJ/m<sup>2</sup> to almost 1000 mJ/m<sup>2</sup> in the presence of a functionalized polymer.Milán FerdinándRóbert VárdaiJános MóczóBéla PukánszkyMDPI AGarticleacoustic emission testinglocal processespolymer compositedeformationfailuredebondingOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3931, p 3931 (2021)
institution DOAJ
collection DOAJ
language EN
topic acoustic emission testing
local processes
polymer composite
deformation
failure
debonding
Organic chemistry
QD241-441
spellingShingle acoustic emission testing
local processes
polymer composite
deformation
failure
debonding
Organic chemistry
QD241-441
Milán Ferdinánd
Róbert Várdai
János Móczó
Béla Pukánszky
Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
description Acoustic emission, the detection of signals during deformation, is a frequently used method for the study of local deformation processes occurring in heterogeneous polymer systems. Most of these processes result in the evolution of elastic waves which can be detected by appropriate sensors. The analysis of several parameters characterizing the waves offers valuable information about the possible deformation mechanism. The acoustic emission testing of composites may yield very different number of signals from a few hundred to more than 100,000. This latter was proved to be affected mainly by particle size, interfacial adhesion and composition, but other factors, such as matrix modulus and specimen size, also influence it. Local deformation processes are claimed to have a strong effect on macroscopic properties. Indeed, a close correlation was found between the initiation stress of the dominating particle related process derived from acoustic emission testing and the tensile strength in both polypropylene (PP) and poly(lactic acid) (PLA) composites. However, in polyamide (PA)-based heterogeneous polymer systems, deformations related to the matrix dominated composite properties. Besides forecasting failure, the method makes possible the determination of the inherent strength of lignocellulosic fibers being around 40 MPa as well as the quantitative estimation of adhesion strength for composites in which interactions are created by mechanisms other than secondary forces. The proposed approach based on acoustic emission testing proved that in PP/CaCO<sub>3</sub> composites, the strength of adhesion can be increased by ten times from about 100 mJ/m<sup>2</sup> to almost 1000 mJ/m<sup>2</sup> in the presence of a functionalized polymer.
format article
author Milán Ferdinánd
Róbert Várdai
János Móczó
Béla Pukánszky
author_facet Milán Ferdinánd
Róbert Várdai
János Móczó
Béla Pukánszky
author_sort Milán Ferdinánd
title Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
title_short Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
title_full Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
title_fullStr Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
title_full_unstemmed Deformation and Failure Mechanism of Particulate Filled and Short Fiber Reinforced Thermoplastics: Detection and Analysis by Acoustic Emission Testing
title_sort deformation and failure mechanism of particulate filled and short fiber reinforced thermoplastics: detection and analysis by acoustic emission testing
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/d9ab4c4c1b8f4f438ad9e829581d779a
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AT robertvardai deformationandfailuremechanismofparticulatefilledandshortfiberreinforcedthermoplasticsdetectionandanalysisbyacousticemissiontesting
AT janosmoczo deformationandfailuremechanismofparticulatefilledandshortfiberreinforcedthermoplasticsdetectionandanalysisbyacousticemissiontesting
AT belapukanszky deformationandfailuremechanismofparticulatefilledandshortfiberreinforcedthermoplasticsdetectionandanalysisbyacousticemissiontesting
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