MTS Systems Landmark 370 Series, Operation

Page: 107 / 134

Running the Example HCF Test
Landmark™ Test System Operation 107
1. “If Necessary, Recover from a Tripped Force Limit” on page 107
2. “If Necessary, Recover from a Tripped Displacement Limit” on page 110
If Necessary, Recover from a Tripped Force Limit
There are a number of possible causes for a tripped force limit. For example:
l
Clamping a grip may result in a force spike higher than expected.
l
Your test limits may not have been set high enough.
l
The specimen may break, resulting in the end of the test.
Rather than cover all possibilities, this section addresses the first case only. Adapt this procedure as
necessary to recover from other cases.
1. Evaluate if the specimen has been damaged.
A. Check meter history to see if acceptable force limits for the specimen have been
exceeded.
B. If they have, switch back to Displacement control, safely remove the specimen from
the lower grip, and start over with a new specimen.
C. If the specimen was not damaged, proceed to the next step.