MTS Fatigue Template - Manual (Page 110)

4. A window appears with the Modulus Check Result.
• Click Accept to accept the result.
• Click Reject to discard the result.
• Click Measure Modulus to perform the modulus check again.
• Click View Data Report to see the results in report form.
11.2.9.0 Ramp to Test Temperature
The Ramp to Test Temperature button prompts you to confirm the ramp to test temperature. Click Yes to
start the ramp or click No to prevent the ramp.
If the test is not at test temperature, you can click Measure Thermal Modulus to continue or click Cancel
for the main menu.
11.2.10.0 Strain-Controlled Test
A typical low-cycle fatigue (LCF) test sequence includes:
1. Ramp to mean level, if the mean level at the start of the test is not zero. All data recorded during the ramp
is stored in cycle number 0 (zero).
2. Identify a stable cycle for comparison with other test values.
3. Start the test cycle count, start test data collection, and run the test to completion.
4. Ramp the system to the mean load of the last cycle.
Cycle 0 (zero)
The application collects data for each complete cycle. A cycle starts at mean level and ends at mean level.
In most cases, mean level is zero. For cases where mean level is not zero, a ramp initially occurs to mean
level before the test actually starts. The application stores the data collected during this initial ramp in cycle
count 0.
Stable cycle determination
The application identifies the stable cycle based on user-entered parameters.
Application-determined stable cycle
For an application-determined stable cycle, a consecutive number of cycles must remain within the stable-cycle
deviation factor to determine the reference cycle. Typical cycle counts are from 5 to 100 cycles.
Enter the percentage deviation that consecutive cycles must be within, as compared to an initial cycle. If a
cycle deviates beyond this percentage before the stabilizing factor amount is reached, that cycle becomes
the new cycle against which following cycles are compared. Typical stable cycle deviation factors are around
1%.
Test completion
The LCF test runs until it meets one of the termination criteria. Examples of test termination criteria include:
• Non-controlling failure threshold (%)
110 MTS TestSuite
11.0 ASTM Trapezoidal Strain Elevated Temperature Template