Temperature Cycling Testing in Practice
Abstract
Andre and Fred discussing some best practice, failure mechanisms and problems when’d temperature cycling testing.
Key Points
Join Andre and Fred as they discuss the in’s and out’s of temperature cycling testing.
Topics include:
- Why and when to do thermal cycling
- Common failure mechanisms
- A few times it didn’t go so well
Enjoy an episode of Speaking of Reliability. Where you can join friends as they discuss reliability topics. Join us as we discuss topics ranging from design for reliability techniques, to field data analysis approaches.
SOR 248 Temperature Cycling Testing in PracticeAndre Kleyner
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Show Notes
With no firm failure mechanism/mode information, Random Vibration followed by Thermal Cycling with few Power On/Off cycles is a good default condition. Screening should not stress the equipment such that fatigue failures are precipitated
Temperature cycling is an important test for electric heaters. The expansion and contraction from heating and cooling leads to one of the primary failure mechanisms for heaters. The different materials in the heater have different coefficients of thermal expansion. So, turning the heater on and off and cycling between near ambient and the operating temperature or maximum achievable temperature helps reveal failure mechanisms and locations. It can also be used as a stress in ALT of heaters. It is also important for temperature sensors in environments with significant temperature deltas.