MTS Series 215 Rotary Actuator - Manual (Page 50)

Series 215 Rotary Actuator Product Manual 50
Test Setup Using Diaphragm Flexures
Operation
specimen which can invalidate the test results or cause premature failure of the
specimen.
Test Setup Using Diaphragm Flexures
If the values derived from the calculations in “Test Setup Using Standard
Flexures” section indicate that diaphragm flexures must be used to reduce side
loads to acceptable levels, then the following calculations should be performed to
ensure that the selected diaphragm flexures are adequate. In addition, this
subsection contains the equations necessary for calculating the stress experienced
by the specimen when diaphragm flexures are installed in the test system.
The following figure shows an example of a test setup in which diaphragm
flexures are mounted at both ends of the test specimen. These would be required
on test setups where both the rotary actuator and the reaction bracket are rigidly
mounted to the reaction base.
Forces Resulting from Base Plate Twisting (Diaphragm Flexures)