- Accelerated Destructive Degradation Analysis

Tearsea Wegscheid

The objective of a test is to provide data to support the claim that a component meets a reliability specification. A problem with such a test is the amount of time needed to generate enough failures to be able to provide an estimate of reliability with a specified confidence level. Quantitative Accelerated Life Testing (QALT) is a method used to shorten a test by applying stress(es) chosen to stimulate the specific failure mode(s) of interest. Degradation analysis can be used with accelerated life tests to further reduce test time. Degradation analysis involves the measurement and extrapolation of a specific performance characteristic that is directly related to the failure mode(s) of interest. Degradation analysis allows the analyst to extrapolate an assumed failure time based on the measurements of degradation or performance over time. This approach typically requires multiple measurements be taken on the same units throughout their life. However, multiple measures may not be possible depending on the characteristic of interest, such as adhesive strength, amount of wear, or corrosion. Due to testing constraints in destructive degradation, only one measurement per sample is possible. The presentation will discuss the models used in accelerated destructive degradation analysis. The presentation will show the relationship between the life stress model, life distribution model, and the degradation model. Finally, it will provide an example of accelerated destructive degradation analysis.