Difference between "Pass/Fail Testing" "Test To Failure" "Degradation Test"

C

Carmine

What is the difference between "pass/fail testing" "test to failure" "degradation test" in the detection ranking of Design FMEA?
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Z

Zbigniew Huber

1. "pass/fail testing"
It is a functional test of a prototype, where functionality is verified without any extensive testing. If the prototype passed test then it is PASS if failed then FAIL.
This test is very weak with detection of defects related to "worn out" issues, material overstress issues, degradation etc.


2. "test to failure"
The prototype is subjected to testing several times and the test is stopped when the prototype fails. Then the failure is investigated for root cause and if necessary the design is improved to eliminate the cause. Example tests are: ALT (accelerated life test), HALT (highly accelerated life test). ALT may detect worn-out mechanisms. HALT may detect design issues where "margins" are too small, weak components etc.

3. "degradation test"
The prototype is subjected to tests for some time (or cycles) and specified key characteristics are measured, then the test continues and again after some time (or test cycles) same characteristics are measured again and so on. It allows to see how the key characteristics change over time/cycles - this is the "degradation". This detection method is ranked better than previous two, because it detects characteristics changes prior prototype functional failure.
 
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