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Acoustical measurement accompanying tensile test: new modality for non-destructive testing and characterization of sheet materials
Ansvarlig organisasjon
2006 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert) Published
Abstract [en]

A series of uniaxial tensile tests was performed for sheet materials like paperboard, polyethylene and packing layered composites. These sheets can be considered as membranes. In parallel with a tensile test, the natural frequency was measured through an acoustical excitation. Firstly, it was shown both theoretically and experimentally that, at a given load, the frequency is sensitive to the local deviation in the standard thickness or to the presence of cracks inside the material. It means that this acoustic measurement can be used as one of the methods of damage assessment, or nondestructive testing in general. Secondly, the resonance frequency shift was continuously monitored for increasing strain on polyethylene and paperboard, and the curves obtained were compared to the stress-strain curves for material characterization. They were not the same and showed a non-monotonic stiffness variation for the polyethylene. It was shown that the resonance frequency shift measurement can successfully replace the stress-strain curve for material characterization under tensile test. During a long time under load an irreversible plastic deformation of the sample takes place, and the frequency shift can also serve as a new method for evaluating the residual strain of the material.

sted, utgiver, år, opplag, sider
Vienna: Vienna University of Technology, Austria , 2006.
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Identifikatorer
URN: urn:nbn:se:bth-8897Lokal ID: oai:bth.se:forskinfo126E9C87FDDB319BC125734C00395141ISBN: 3-9501554-5-7 (tryckt)OAI: oai:DiVA.org:bth-8897DiVA, id: diva2:836672
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13th International Congress on Sound and Vibration
Tilgjengelig fra: 2012-09-18 Laget: 2007-09-04 Sist oppdatert: 2015-06-30bibliografisk kontrollert

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Rudenko, OlegHedberg, ClaesKao-Walter, Sharon

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