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Title: Methods for the Design, Quality Control, & Management of Fatigue-Limited Metal Components
Author: Berkley
Source: US Patent 5,625,664
Publication year 1995
Document number: 1995036
Number of pages: 16
Abstract:
Improved methods for managing a population of metal components subject to fatigue failure are provided. The residual compressive stress in the critical surfaces of such
components, especially in areas of high stress concentration, are measured non-destructively using x-ray diffraction techniques. The measured surface residual compressive
stress is used as a management criterion. A component having a surface residual compressive stress greater than a predetermined value can be returned to service. However,
once the measured surface residual compressive stress of a component falls below the predtermined value, it can either be removed permanently from service, or it can be
reworked to increase its surface residual compressive stress and then returned to service. Additionally, by measuring the surface residual compressive stress of an
individual component, the remaining servic life of that individual component can be estimated. These methods for management of populations of such metal components allow for
increasing the service life of the components in a safe and effective manner. Methods are also provided for the manufacture and/or design of metal parts with improved
performance criterion (e.g., reduction in weight) while maintaining acceptable service life. Methods using surface residual compressive stress measurements during and/or
after the manufacturing process in order to prevent, for example, introduction of metal parts having insufficient surface residual compressive stress levels for their
intended use.
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