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2022-05-24T19:15:35Z

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[[Category: SOP]]
= Safety =
No Safety Parameters noted

NOTE: Machine and Transducers are FRAGILE

=Device and Sample Set-Up=
#Attach LCM-74-4 transmitting wire and turn on the Olympus 38DL PLUS.
#Attach appropriate transducer for wave type being measured.
#Programs for these experiments were pre-set into the Olympus 38DL PLUS and can be recalled by pressing the “XRDR - RECALL”. The arrow keys may be used to select the proper program.
#* Longitudinal wave velocity program: M112
#* Transverse wave velocity program: Shear- Lift
#**When in doubt, the name of the program you should be using may match a program that shares the name of the transducer being used.
#Prep samples by recording thickness measurements at least three marked locations on each sample. These will be the areas that are tested.
#Apply a small amount of the appropriate couplant at each test site.
=Standard Operation Procedure=
#Select the red “MEAS” button to return to the main data screen.
#Prior to each measurement enter in the measured thickness. Select “2ND-F” and “XRDR-RECALL”. The value can be changed with the up and down arrows. To exit the window press “ENTER” or “MEAS”.
#Wave velocity readings are taken at test sites by firmly holding transducer in the couplant at marked testing areas.
#*DO NOT DRAG THE TRANSDUCER ALONG THE SAMPLE
#Once the reading displayed on the Olympus 38DL PLUS stabilizes, record the shown value in μm/s.
#Wipe samples and transducers clean with tissues and ethanol in between the use of different couplants and transducers.
#Modulus Calculations can be performed using the following equations... 

:::::G=ρvs2 
:::::v=(2-(vl/vs)2)/(2*(1-(vl/vs)2 
:::::E=2(1+v)G

:::::*Where G=Shear Modulus of the Material, vs represents the velocity of the wave in shear, ρ is the density of the material,vl is the velocity of the longitudinal wave, and v is Poisson's ratio

Ultrasonic Modulus - Revision history

Gcanzalo: Copied from old