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An Experimental Study of Ultrasonic Attenuation in Microporous Polyethylene by K.L. Alderson; R.S. Webber; U.F. Mohammed; E. Murphy; K.E. Evans is a Engineering article available to read on EtoBox.

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## Auxeiic foams, i.e. those possessing a negative Poisson's ratio, Y, are known to possess improved sound absorption properties when compared with conventional foams. In this study, the ultrasonic attenuation of another class of auxetic materials, microporous polymers, and in particular ultra-high-molecular weight polyethylene ( UHiU WPE) , was examined experimentally, in comparison with a microporous positive u form of UHiUWPE and conventionally processed UHM WPE. Ii was found that the microporous polymers, whether auxetic or not, showed very large enhancements in attenuation coe@cient, a,,,,,. over the conventionally processed UHA4 WPE, with the highest measurable value being a,,=47 dB/cm for the auxetic material, which is 1.5 times the highest value for the microporous positive v UHMWPE and more than three times that for the conventionally processed material. In addition, the samples with the largest negative Poisson's ratio absorbed the signal so completely that no value of a was obtainable.

Who reads An Experimental Study of Ultrasonic Attenuation in Microporous Polyethylene?

Author

K.L. Alderson; R.S. Webber; U.F. Mohammed; E. Murphy; K.E. Evans

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0003-682X)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)