Dynamic modelling of some nonlinear materials

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Claes Hedberg
Title: Dynamic modelling of some nonlinear materials
Translated title: Dynamisk modellering av några material
Conference name: FORUM ACUSTICUM ( European Acoustical Association etc) SEVILLA September 16-20, 2002
Year: 2002
Pagination: 6 pages
City: Sevilla, Spain
Organization: Blekinge Institute of Technology
Department: Dept. of Mechanical Engineering (Institutionen för maskinteknik)
Dept. of Mechanical Engineering S-371 79 Karlskrona
+46 455 38 50 00
Authors e-mail: claes.hedberg@bth.se
Language: English
Abstract: A nonlinear layer can be a model for a cloud of gas bubbles in a liquid, a crack or split plane in a solid, or contact between two tighted surfaces. Solutions were derived for media under strong load.
Numerical calculations based on Preisach-Mayergoyz space description (nonlinear stress-strain relationships typical for solids containing mesoscopic inhomogeneities or defects) have given results like those obtained from LISA (see results by Delsanto).
Non-uniform massdistribution of grains immersed into a vibrating fluid create internal forces which is responsible for generation of higher harmonics.
Tests on slow dynamics were performed.
Subject: Mechanical Engineering\Structural Dynamics
Mechanical Engineering\General
Keywords: nonlinear material description, nonlinear acoustic crack detection, nonlinear elastic wave spectrosopy, nonlinear nondestructive testing, slow dynamics