MTS Axial Extensometers - Manual (Page 61)

Installation 61
Contact force
Determining the specimen contact force when using elastic bands is
difficult.
• Greater contact force will provide a more secure attachment under
conditions where slippage may occur such as operating at high
cyclic frequencies. The knife edges can damage the specimen at
high contact forces.
• Less contact force will reduce the possibility of damage to soft
specimens; however, the possibility of slippage increases.
The disk attachment is for
narrow, flat specimens.
The wireform attachment is
for wide, flat specimens.