Accelerated Testing: Statistical Models, Test Plans, and by Wayne B. Nelson

By Wayne B. Nelson

This useful source presents modern, statistical tools for speeded up checking out together with try out versions, analyses of knowledge, and plans for checking out. every one subject is self-contained for simple reference. insurance is vast and precise sufficient to function a textual content or reference. this useful booklet beneficial properties actual attempt examples in addition to facts analyses, desktop courses, and references to the literature.

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Additional resources for Accelerated Testing: Statistical Models, Test Plans, and Data Analysis 1st edition (Wiley Series in Probability and Statistics)

Sample text

Experimental work to determine appropriate stresses may be required. Such stresses should accelerate the failure modes of interest. Also, they should avoid accelerating failure modes that do not occur at design conditions. If there are extraneous failure modes, the data can still be properly analyzed (Chapter 7). The choice of such accelerating stresses is an engineering matter outside the scope of this book. Multiple stresses. More than one accelerating stress may be used. This is done for various reasons.

A week on test is comparable to 10 to 20 years in service. ) seen in service. This “index” test is used to monitor quality, to compare proposed design and manufacturing changes (including cost savings), and to qualify new designs and vendors. This test ignores chemical degradation. Toaster test. In a life test, toasters are repeatedly cycled. That is, the handle is pushed down, the toaster heats, and finally pops. One cycle immediately follows another (reduced off-time). To speed the test and make it more realistic, fans cool the toaster between cycles.

Many accelerated tests are routine and get little forethought. However, this book can improve even such routine tests. New tests, especially, require forethought about the topics above. Ideally, as an aid to planning, one should write the final report before running the test. Blank spaces in the report can be filled in when data are collected. Also, it is very useful to run a pilot test with a small number of specimens. The pilot test should involve all steps in fabrication and testing. This will reveal problems that can be corrected before the main test.

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