Some Aspects of Accelerated Life Testing by Progressive Stress

This paper uses some basic assumptions to derive the life distribution of product under accelerated life testing by progressive stress, when the life distribution under design constant stress follows an exponential or a Weibull distribution. It discusses the special case when the acceleration equation satisfies the inverse power law and progressive stress is directly proportional to time. Maximum likelihood (ML) methods estimators are derived and their properties are discussed, eg, invariance, uniqueness, and existence.