How to select pucks, How to select pucks 29 – MTS Advantage Screw Action Grip User Manual
Page 29
MTS Advantage™ Screw Action Grips
Operation
29
How to Select Pucks
There are two types of puck selection:
•
Nonfixed (both knobs are adjusted for specimen installation and the
same type of puck is used on both sides of the grip)
•
Fixed (only one knob, either the left or right, is adjusted for specimen
installation and an aluminum puck is used on the fixed side)
Use the nonfixed configuration for extra follow-through action. Use the
fixed configuration when extra follow-through is not needed and many
specimens of the same thickness are being tested in series.
Use the following calculation procedures to determine which type of puck to
use for specific tests. Puck selection calculations are given for both the fixed
and nonfixed configurations. All variables remain the same for both puck
selection calculations.
Using the following variables, calculate the specimen’s clamp stiffness.
K = Specimen stiffness (N
/
m or lbf
/
in)
A = Specimen contact area (mm
2
or in
2
)
W = Specimen contact width (mm or in)
E = Specimen modulus (N
·
m
2
or
lbf
·
in
2
)
L = Specimen thickness (mm or in)
H = Specimen contact height (mm or in)
W
L
H