MTS Fracture Template - Manual (Page 78)

Description Parameter
Specify the percentage of the measured load
range used as the upper limit for linear least Precrack Upper Least
Squares Fit Percentage
squares fit compliance determination. This
parameter is not used for FCG DCPD tests.
Specify the percent of maximum load level
at which the voltage is measured. The load Precrack Measure Load
Level Percent
is applied at this level to ensure the crack is
open. All voltage data below this load will not
be used to calculate crack length. This
parameter is used only for FCG DCPD tests.
Specify the number of cycles at which
precrack activity stops. Precrack Cycle Limit
Specify the maximum stress intensity desired
at the end of precrack activity. The initial Precrack Final Maximum
K
precrack Maximum K is 1.4 times the Final
Maximum K value.
Select Yes to cause an interlock at the end
of precrack. This can shut down hydraulics,
if desired. Shutdown Station at End
of Precrack
CTOD Parameters
In the CTOD Parameters section of the Main menu, you select COD or Displacement as the control
mode for the test, and then specify the Ramp Rate, which is the rate for the ramp segment of the CTOD
step.
Data Storage Parameters Properties
Data Storage Parameters
Description Parameter
Specify the percentage of precrack activity
that must complete before data is saved to
disk. Precrack Save Percent
Limit
Specify the cycle intervals written to disk
during the precrack activity. Store Every Nth Precrack
Cycle
78 | MTS TestSuite
Run the CTOD Fracture Toughness Test