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167 views
09:02 Jan-13-1999
Matthias Gester
stress measurement

I try to derive shear stress from time-of-flight
measurements of surface waves travelling across my
stressed workpiece. As long as any other parameters
are kept constant this should be straight forward.

Being a newcomer to the field I am confused as to
how the elastic modulus of my material and the temperature affect the time-of-flight.
Are stress, elastic modulus, and temperature 3
independent variables entering the equation for the
velocity or are they related to each other (I know
that the elastic modulus is temperature dependent,
is this the only connection between velocity and
temperature?) Is their an analytical expression which
relates these 3 quantities to the velocity.

A second question concerns the direction of travel,
does it matter whether the wave travels in direction
of the shear force or opposite to it.

I would be very grateful if the experts could give me
some help with probably rather basic questions.
Thanks
Matthias


 


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