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Nonlinearity of Solids with Micro- and Nanodefects and Characteristic Features of Its Macroscopic Manifestations
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2010 (engelsk)Inngår i: Acoustical Physics, ISSN 1063-7710, E-ISSN 1562-6865, Vol. 56, nr 2, s. 151-157Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The meaning of the experimentally measured nonlinear parameters of a medium is discussed. The difference in meaning between the local nonlinearity, which is measured in the vicinity of a single defect and depends on the size of the region of averaging, and the effective volume nonlinearity of the medium containing numerous defects is emphasized. The local nonlinearity arising at the tip of a crack is calculated; this nonlinearity decreases with an increase in the region of second harmonic generation. The volume nonlinearity is calculated for a solid containing spherical cavities. The volume nonlinearity is also calculated for a medium containing infinitely thin cracks in the form of circular disks, which assume the shape of ellipsoids in the course of the crack opening. The nonlinear acoustic parameter is calculated with the use of the exact classical results of the theory of cracks.

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pleiades Publishing , 2010. Vol. 56, nr 2, s. 151-157
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URN: urn:nbn:se:bth-7678Lokal ID: oai:bth.se:forskinfo548B2B800AE5D409C12578050033CC3AOAI: oai:DiVA.org:bth-7678DiVA, id: diva2:835322
Tilgjengelig fra: 2012-09-18 Laget: 2010-12-26 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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