Publication date: 07/30/2020

In this example, suppose that you need to design an accelerated life test for a mechanical component. The single acceleration factor is torque, and the normal use stress is 35 Nm (newton meters). You want to estimate the time at which 10% of the units fail at the normal use stress. You construct a failure probability optimal ALT test.

Your test plan has the following characteristics:

• A total of 100 units are available for testing.

• The life distribution is assumed to be Weibull.

• The life-stress relationship is given by the logarithmic transformation.

• You plan to test torque at three stress levels: 50, 75, and 100 Nm.

• You have prior knowledge to predict initial failure times at the test levels. See Obtain Prior Estimates.

• The test will continue for 5,000 cycles.

• You will monitor the process for failures on a continuous basis.

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