Reliability Prediction for Mechanical and Electromechanical Parts

摘要

The reliability of selected parts is investigated from the viewpoint of materials behavior throughout parts-materials history, including process, fabrication, test, handling, and early operation. The parts studied are: Mechanical (bearings and gears), Electromechanical (brushes and contacts). Failure mechanisms were examined on the basis of a SCWIFT taxonomy: S - Stress-Creep Rupture; C - Corrosion; W - Wear; I - Impact; F - Fatigue; T - Thermal. Dominant among the mechanisms of failure were wear and fatigue phenomena. A multistage process was developed for organizing analytical and empirical investigation of part failure causes in a broader sense, based on materials influences which may be statistically related to part survival. The definition of a retrospective part survival function was proposed. Data and relationships covering flaw propagation, fracture, corrosion, surface fatigue, and the influence of materials and manufacture was given for the parts studied. (Author)