Thermal Shock Testing — Transfer Rates, Fixturing & Failure Detection
Thermal shock exposes a specimen to rapid temperature transitions, typically by transfer between hot and cold chambers. The stress depends on the transfer time, dwell and the specimen's thermal mass — the profile must be defined for the actual article, not copied from a template.
Specify the real stress
Air-to-air two-zone shock, liquid-to-liquid shock and slower thermal cycling produce very different stresses. State the temperature extremes, dwell criteria (air recovery versus specimen stabilization), transfer time and cycle count from the governing specification. Where no specification exists, agree a justified profile with the laboratory and record its basis.
Control the specimen condition
Fixturing, orientation, wiring and operating state change the delivered stress. Powered monitoring catches intermittent failures that post-test inspection misses. Ask how the laboratory verifies specimen temperature, not just chamber setpoints, and how it documents recovery times.
Define inspection and failure criteria
Cracking of solder joints, seals, encapsulants and coatings is a common target. Agree pre- and post-test examinations — visual, electrical, X-ray or sectioning — and retain failed specimens for analysis. Passing a defined profile supports the intended environment; it is not a general durability guarantee.
Sample considerations
- Provide the article, its mass and materials, and the governing specification or intended environment.
- State operating state during test, monitoring needs and acceptance criteria.
- Agree profile parameters, fixturing, cycle count and post-test examination plan.
Questions to ask a laboratory
- How is specimen temperature and recovery verified during the profile?
- What monitoring detects intermittent failures during cycling?
- Which post-test examinations confirm or locate damage?
Laboratories with relevant capabilities
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Sources and scope references
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