MTS Multipurpose Simulated - Manual (Page 75)

5.5.2.5.0 COD Mode Parameters
COD Mode Parameters
Description Parameter
Specify the amount of force, in force units,
to unload in both the unload and reload
segments. JIC Absolute Unload
Specify the COD increment that will be
added to the current COD level at the JIC COD Increment
beginning of each ramp segment to
determine a maximum COD for this step. If
the maximum COD is reached before the
maximum displacement or load level is
reached, it triggers the next segment of the
step.
Specify the length of time to hold at constant
COD or Displacement in the hold crack JIC Crack Propagation Hold
Time
propagation activity. If this time is zero, the
hold crack propagation activity is bypassed.
Specify the inverse of the compliance of the
test system. This term is used to determine JIC Frame Stiffness
the displacement due to load frame
deflection and the deformation of fixtures.
The resulting displacement is subtracted
from the measured displacement when
calculating the energy absorbed by the
specimen.This is particularly important when
using SE(B) specimens.
Specify the ramp rate for the initial ramp
segment when it is done in load control. JIC Load Ramp Rate
Specify the number of unload and reload
segment pairs to perform in each step
increment of the JIC test. JIC Number of Unloads
Specify the percentage of the load of the final
precrack cycle to use as the load for the end
of the first ramp segment. JIC Percent of Final
Precrack Load
Specify the amount of force to unload as a
percentage of the increment peak load. JIC Percent Unload
Specify a value other than zero to apply a
displacement limit during the ramp segment JIC Ramp Displacement
Limit Increment
of a JIC step. The limit trips if the measured
MTS TestSuite 75
5.0 Running Simulation Tests