Meaning
Environmental testing protocols use elevated heat to simulate years of operation in a few weeks. Through thermal stress acceleration, engineers can identify potential weaknesses in the solder joints or packaging materials of a new product. This method relies on the principle that many chemical and physical failure modes occur faster at higher temperatures.
Failure Analysis
Testing at extreme temperatures forces latent manufacturing defects to surface early in the development cycle. Applying thermal stress acceleration reveals issues like delamination or brittle fractures in the interconnects. These faults might take years to appear at room temperature but become visible within days under stress.
Identifying these problems before mass production prevents costly recalls and field failures.
Model Selection
The calculation of equivalent aging time requires a specific mathematical relationship. Most labs use the Arrhenius equation to determine the appropriate duration for thermal stress acceleration based on the activation energy of the expected failure mode. Different materials require different constants to ensure the simulation remains accurate.
An incorrect model might overstress the parts and cause failures that would never happen in the real world.
Reliability Testing
Certification of industrial hardware involves long periods of exposure in a controlled chamber. During thermal stress acceleration, the devices are often powered and monitored for functional errors. This data provides the statistical basis for the mean time between failures.
