MTS Fracture Template - Manual (Page 28)

Description Parameter
Specify the percentage of the measured load
range used as the lower limit for linear least Precrack Lower Least
Squares Fit Percentage
squares fit compliance determination. This
parameter is not used for FCG DCPD tests.
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
Crack Growth Parameters
In the Crack Growth Parameters section of the main menu, you select the control mode for the test and
then specify the parameters for the selected mode:
• Delta-K
• Constant Load
28 | MTS TestSuite
Fatigue Crack Growth (FCG) Template