Design of Experiments Guide  • Accelerated Life Test Designs • Example of an Accelerated Life Test Design

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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:
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A total of 100 units are available for testing.
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The life distribution is assumed to be Weibull.
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The life-stress relationship is given by the logarithmic transformation.
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You plan to test torque at three stress levels: 50, 75, and 100 Nm.
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You have prior knowledge to predict initial failure times at the test levels. See Obtain Prior Estimates.
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The test will continue for 5,000 cycles.
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You will monitor the process for failures on a continuous basis.

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Help created on 3/19/2020