东芝电子可靠性测试(17)

The accelerated lifetime test is also sometimes used as a forced degradation test to forcibly accelerate a constant stress. It is also sometimes used as a limit test for accelerating stress to determine a limit value.

It is necessary to be noted that failure mechanisms in accelerated tests differ somewhat from those that occur under actual usage conditions. In general, if the degradation mechanism is simple, acceleration is also simple and lifetime and failure rates can be estimated relatively accurately. Complicated failure mechanisms, however, are difficult to simulate, even when best efforts are made to accelerate stresses simultaneously. This is because the different stress effects are interrelated. Therefore, analysis of acceleration data as well as estimation of lifetime and failure rates can be difficult. When performing accelerated lifetime tests, it is important to select test conditions that result in as few failure mechanism changes as possible and that minimize the number of failure mechanisms, making testing easy and simple.

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