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 B10 life, which is the life at which 10% of the units fail at the normal use stress.
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 will test at torque three stress levels: 50, 75, and 100 Nm.
• You have some prior knowledge to help you guess failure times at the test levels. More details appear in
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