Design an Optimal Plan of Accelerated Degradation Test with Acceleration Factor Constant Principle  
Author Hao-Wei Wang
Co-Author(s) Fei Teng
Abstract Accelerated degradation test (ADT) has been extensively applied to reliability assessment for degradation products. To improve the efficiency-cost ratio of ADT, the optimal theory and method of designing ADTs become a research hot. In order to promote the development of optimal design methods, an optimal design method based on acceleration factor constant principle, in which a Wiener degradation model and a step-stress ADT were considered, was proposed in the paper. Different from the traditional method assuming which parameters of Wiener degradation model are dependent on accelerated stress, acceleration factor constant principle was applied to derive the changing rules of parameters with accelerated stress. Besides, the expression of acceleration factor can be obtained for a Wiener degradation model. In order to ensure that the failure mechanism of products under accelerated stresses is probably consistent with that under the normal use stresses, the asymptotic variance of acceleration factor, which was considered to be a measure of the consistency of failure mechanisms, was selected to be the objective function of optimal problem. Through a case application in which the accelerated degradation test of a certain type electrical connector was optimally designed, the effectiveness and feasibility of the proposed method was validated.
Keywords Acceleration factor; Accelerated degradation test; Optimal design; Failure mechanism; Wiener degradation model
    Article #:  23-103
Proceedings of the 23rd ISSAT International Conference on Reliability and Quality in Design
August 3-5, 2017 - Chicago, Illinois, U.S.A.