Mts Fracture Template User Manual download pdf (Page 46)

DescriptionParameter

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

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

JIC Parameters

In the JIC Parameters section of the main menu, you select COD or Displacement as the control mode

for the test, and then specify the parameters for the selected mode.

COD Mode Parameters

DescriptionParameter

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.

46 | MTS TestSuite

JIC Fracture Toughness Template

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