Now customize the name of a clipboard to store your clips. in order to accelerate or stimulate the failure mechanisms. It can also be used to assist in the performance of risk assessments, design comparisons, etc. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE -AC04-94AL85000. If you continue browsing the site, you agree to the use of cookies on this website. They have been referred to by many names including: Qualitative tests are performed on small samples with the specimens subjected to a single severe level of stress, to multiple stresses, or to a time-varying stress (e.g., stress cycling, cold to hot, etc.). As the name implies, the time taken to failure is advanced, by prolonged use of the product. ), the mapping possibilities are still infinite since they depend on the parameters of the chosen model or relationship. For simplicity we will assume that the product was tested under a single stress at a single constant stress level. In addition to proper stress selection, the application of the stresses must be accomplished in some logical, controlled and quantifiable fashion. Provide valuable feedback in designing quantitative tests, and in many cases are a precursor to a quantitative test. In other words, if temperature is the thermal stress, each unit is tested under the same accelerated temperature, (e.g., 100° C), and data are recorded. The mean life which provides a measure of the average time of operation to failure. Over the years, the phrase accelerated life testing has been used to describe all such practices. For products which do not operate continuously under normal conditions, if the test units are operated continuously, failures are encountered earlier than if the units were tested at normal usage. In such cases, usage acceleration, even though desirable, is not a feasible alternative. Clearly, as the stress used in an accelerated test becomes higher, the required test duration decreases (because failures will occur more quickly). Normally, these stress levels will fall outside the product specification limits but inside the design limits as illustrated next: This choice of stresses/stress levels and of the process of setting up the experiment is extremely important. These elements of analysis are graphically shown next: The combination of both an underlying life distribution and a life-stress model can be best seen in the next figure where a pdf is plotted against both time and stress. This method of accelerated life testing is called overstress acceleration and is described next. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Usage Rate Acceleration: This method is otherwise known as Compressed Time Acceleration. Products subjected to time-dependent stress loadings will yield failures more quickly, and models that fit them are thought by many to be the "holy grail" of accelerated life testing.
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