Design of Experiments Guide > Accelerated Life Test Designs > Example of an Accelerated Life Test Design
Publication date: 08/13/2020

Example of an Accelerated Life Test Design

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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