Thema: nichtlineare Akustik, Verformung, Theorie
Autor/Institution: Ravasoo, A.
/Estonian Academy of Sciences, Tallinn, EE
Title: Ultrasonic nondestructive evaluation of inhomogeneous plane strain in
elastic medium
Titel : Zerstörungsfreie Ermittlung inhomogener ebener Verformung in
elastischen Medien mittels Ultraschall
Quelle : Res. in Nondestr. Eval.
13 7
1995
; 1
; S.55-68
; 14S,6B,7Q
; BAM-Z-1535/95
; T
Abstract:
The possibility to enhance the efficiency of ultrasonic nondestructive
testing making use of non-linear effects of wave propagation is
investigated theoretically. The quasi one-dimensional problem of non-
linear longitudinal wave propagation in elastic medium undergoing
inhomogeneous plane prestrain is solved. The solution establishes the
relations between the physical and geometrical properties of the medium,
parameters of its predeformed state and the characteristics of the wave
with smooth arbitrary initial profile. The idea is to extend the
efficiency of NDT by using, besides the wave velocity measurement data,
the data about the wave profile evolution. The basic physical effects
responsible for the distortion of wave profile are nonlinearity,
dispersion, inhomogeneity, and dissipation. These effects can act
separately or in various combinations. The three first effects are taken
into account. The non-linear-sine-wave propagation in the medium with two
traction-free surfaces is considered in more detail. The algorithm for
evaluation of the parameters of plane strain on the basis of wave velocity
and its profile evolution measurement data is proposed. .1 F33,B13,A25
Database Keywords: Ultraschallprüfung, :Verformung, Inhomogenität, :Schallausbreitung,
Longitudinalwelle, Theorie, Mathematische Formel, Mechanische Vorspannung
23 :Nichtlineare Akustik, Eindimensionale Behandlung
24 Z:E
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