0 set up the test, 0 high-cycle fatigue load test template, 0 set up a test – MTS Fatigue Template User Manual
Page 54: Set up the test
7.1.0 Set Up the Test
7.1.1.0 High-Cycle Fatigue Load Test Template
The High-Cycle Fatigue (HCF) Load Test performs a load-control test sequence to identify the fatigue life of
a material.
A typical high-cycle under-load-control test includes:
1. Identify a stable cycle for comparison to other test values.
2. Start the test cycle count, start test data collection, and perform the test to completion.
The application checks the various settings and values to make sure they are within the system capabilities
or test requirements.
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 on the
order of 1%.
Test completion
The high cycle load test runs until it meets one of the termination criteria. Examples of test termination criteria
include:
•
Displacement failure change percent
•
Number of load cycles
•
Peak load level control change
For tests run in load control, you define a displacement peak for failure detection. When the stable cycle is
reached, the test compares the peak displacement against this cycle to determine if the test is complete due
to crack initiation or specimen failure.
Number of load cycles is self-explanatory.
Peak-valley failure can occur when the load value fails to meet a predefined limit or the displacement value
exceeds predefined limits.
7.1.2.0 Set Up a Test
To create and run a new test:
54 MTS TestSuite
7.0 ASTM High-Cycle Fatigue (HCF) Load Test Template