By Wayne B. Nelson
Sped up checking out Statistical versions, attempt Plans, and knowledge Analyses; Contents; Preface; 1. creation and heritage; 2. types for all times assessments with consistent tension; three. Graphical facts research; four. entire information and Least Squares Analyses; five. Censored info and greatest Ukelihood equipment; 6. try Plans; 7. Competing Failure Modes and measurement impression; eight. Least-Squares Comparisons for whole info; nine. greatest chance Comparisons for Censored and different facts; 10. types and knowledge Analyses for Step and ranging pressure; eleven. speeded up Degradation; Appendix A. Statistical Tables; References; Index
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ASTM Standard D2631-68 (1970) describes how to carry out progressive stress tests on capacitors. Cyclic stress. In use, some products repeatedly undergo a cyclic stress loading. For example, insulation under ac voltage sees a sinusoidal stress. 4. Cyclic-stressloading. stress cycle. A cyclic stress test for such a product repeatedly loads a specimen with the same stress pattern at high stress levels. 4 depicts a cyclic stress test. For many products, a cycle is sinusoidal. For others, the duty (or test) cycle repeats but is not sinusoidal.
Engineers developed an accelerated test to study this problem - the sludge test. It was used to compare tubing designs, including competitors’ designs. The test involved repeatedly running a coffee maker with a mineral-rich slurry that quickly produced build-up. By definition, a coffee maker “failed” on the first pot that took longer than 20 minutes. Of course, 20 minutes is a reasonable but arbitrary time; it owes much to the number of fingers we have. 2 minutes would be as good. Customer-defined Failure.
Data may also consist of a mixture of the above types of data. Purpose. Analyses of such censored and interval data have much the same purposes as analyses of complete data, for example, estimation of model parameters and the product life distribution and prediction of future observations. 3. TYPES OF ACCELERATION AND STRESS LOADING This section describes common types of acceleration of tests (high usage rate, overstress, censoring, degradation, and specimen design) and stress loading. Test purposes (Section 4) might profitably be read first.