MTS Multipurpose Simulated - Manual (Page 38)

5. Typically, the activity will stop when a desired test termination parameter is achieved. In this case, review
the activity end result, and then click Close.
5.2.3.5.0 Perform Fatigue Crack Mark
1. Click Crack Size Check in the Main Menu window.
2. In the Main Menu window, click Fatigue Crack Mark.
3. Specify the Crack Growth Parameters.
This test activity uses fatigue crack growth with a constant load control mode.
4. Review the parameters.
a) Click Yes to start with the parameters that are shown.
b) Click No to return to the Main menu, change parameters, and click Fatigue Crack Mark.
5. Click Run on the control panel to start the test activity. Optionally, if you want to review or change
parameters, click Return to Main Menu.
To suspend the activity after it starts, click Hold. When you suspend the activity, data collection stops and
the application attempts to hold at the mean level.
To stop the activity, click Stop. When you stop the activity, the application immediately ramps to zero load
and saves the test data.
6. Review the process of the test activity by monitoring the runtime displays.
7. Typically, the activity will stop when a desired test parameter is achieved. In this case, review the activity
end result, and then click Close.
5.2.3.6.0 Constant Load Control Mode Parameters
Constant Load Control Mode Parameters
Description Parameter
Specify the ratio of the minimum to maximum
load applied to the specimen. The minimum FCG Load Ratio
load is determined by this value and the
maximum load is specified by you.
Specify the desired end level of the command
signal. FCG End Level 1
Specify the cycle frequency of the command
signal. FCG Frequency
Specify the wave shape of the command
signal. FCG Wave Shape
The choices are True Sine or True Ramp.
Typically, you use a True Ramp wave shape
where uniform strain-rate sensitivity is
important, and a True Sine wave shape
where a continually varying strain rate is
38 MTS TestSuite
5.0 Running Simulation Tests