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- W1969999084 abstract "1 . The propaga t ion of stress waves in l inear ly viscoelast ic mater ia ls has m a n y different and in te res t ing aspects. Many of these aspects are referred to the p ropaga t ion of longi tud ina l quas i -monochromat ic waves a long a s lender rod or f i lament , the specimens being sufficiently long for reflection f rom the opposi te end to be negligible. Such an a r r angemen t has been used expe r imen ta l ly by a number of workers as a m e t h o d of measur ing the viscoelast ic proper t ies of var ious high po lymers at audio frequencies (1). Owing to damping , t he usual defini t ion of group ve loc i ty for these waves m a y become meaningless and must be g iven more precisely. This can be done by considering the energy of the phys ica l phenomenon of w a v e propagat ion . In such a con tex t WAI~SHTnIN (3) has g iven a definit ion of group ve loc i ty for quas i -monochromat ic waves in an absorbing med ium, which coincides wi th the ve loc i ty of energy t ranspor t g iven by BRILLOUIN (a,4) p rov ided t h a t the absorpt ion is not too h igh; for h ighly absorbing media , this is t rue at least in t he first s tage of t he propagat ion . I n this paper we will show t h a t the energy ve loc i ty of quas i -monochromat ic viscoelast ic waves results equal to the phase veloci ty , when the med ium is represented by : a) S tandard L inear Solid (or S.L.S.), or b) Maxwel l Model." @default.
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- W1969999084 date "1973-03-01" @default.
- W1969999084 modified "2023-09-27" @default.
- W1969999084 title "On energy velocity of viscoelastic waves" @default.
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- W1969999084 doi "https://doi.org/10.1007/bf02759055" @default.
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