Methods for Prediction of Electro-Mechanical System Reliability

摘要

The objective of this program is to develop methods, relationships, and/or guidelines for evaluating and predicting, during the design stage, the reliability of those types of military equipments which make extensive use of both electronic and mechanical components. During this report period, program effort was concerned with three major areas. The first area, failure mechanics, was concerned with the basic mechanics and material factors which influence mechanical reliability characteristics. Specific topics investigated in this area include the evaluation of the effects of a mean stress superimposed upon a fluctuating stress on fatigue life characteristics, and the evaluation of fatigue damage effects. The second area was concerned with the study of specific mechanical parts. In this case, the major factors affecting spring reliability characteristics are discussed. The third area involved the system reliability aspect. Here, the basic concepts of the system reliability effort have been developed. The system reliability effort in this program is concerned with the system-component relationships applicable to system reliability analysis, and with the most effective utilization of available reliability oriented information at both the part and system levels in developing a comprehensive electro-mechanical reliability evaluation methodology. (Author)