5 t.O 



.? 0.2 



8 12 16 20 24 28 32 

 FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 34 — Attenuation per wavelength for shear waves in polyethylene. 



10^x2.9 



>2.7 



u 

 o 



UJ 



> 2.6 



10 12 14 16 18 20 22 24 26 28 30 32 

 FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 35 — ^Velocity of longitudinal waves in nylon 6-6 plotted as a function of 

 temperature and frequency. 



0.18 



0.08 



8 10 12 14 16 18 20 22 24 26 



FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 36 — Attenuation per wavelength for longitudinal waves in n3'lon 6-6 

 plotted as a function of temperature and frequency. 



164 



