The test heating / cooling rate of the high and low temperature impact test box is not less than 30 ℃ / minute. The temperature change range is very large, and the severity of the test also increases with the temperature change rate.
The difference between the temperature shock test and the temperature cycle test is mainly the different stress loading mechanism. The temperature shock test mainly examines the failure due to creep and fatigue damage, while the temperature cycle mainly examines the failure due to shear fatigue.
The temperature shock test allows the use of a two-slot test device; the temperature cycle test uses a single-slot test device. In the two-tank cabinet, the temperature change rate should be greater than 50 ° C / min.
Causes of temperature shock: dramatic temperature changes in manufacturing and repair processes such as reflow soldering, drying, reprocessing, repairs, etc.
Accelerated stress test: The accelerated test is an accelerated test performed on the test sample in a shorter time than in the actual environment to investigate its failure mechanism. The acceleration of the test is to use the method of increasing stress to promote the test sample to fail in a short time, but care must be taken to avoid the failure mechanism caused by other stress causes.
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