MTS Multipurpose Simulated - Manual (Page 46)

Description Parameter
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 load level at which the voltage is
measured. The load is applied at this level Precrack Measure Load
Level
to ensure the crack is open. 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.
5.3.2.4.0 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
5.3.2.5.0 Delta K Control Mode Parameters
Delta K Control Mode Parameters
Description Parameter
Specify the ratio of the minimum to maximum
K applied to the specimen. The minimum K FCG Load Ratio
is determined by this value and the maximum
K is specified by you.
Specify the maximum stress intensity (K)
value used in Delta-K control. FCG Delta-K Max
Specify the maximum and minimum stress
intensity change as the crack size changes. Normalized K Gradient (C)
Specify the cycle frequency of the command
signal. FCG Frequency
46 MTS TestSuite
5.0 Running Simulation Tests