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Proceedings of a Workshop on Materials State Awareness (2008)

Chapter: Introductory Comments

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Suggested Citation:"Introductory Comments." National Research Council. 2008. Proceedings of a Workshop on Materials State Awareness. Washington, DC: The National Academies Press. doi: 10.17226/12246.
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Suggested Citation:"Introductory Comments." National Research Council. 2008. Proceedings of a Workshop on Materials State Awareness. Washington, DC: The National Academies Press. doi: 10.17226/12246.
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Page 2

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Introductory Comments Kumar V. Jata, Air Force Research Laboratory U.S. Air Force (USAF) weapons systems use a broad spectrum of materials and components processed through various complex materials processing routes and must be able to operate in a wide range of environments from benign to extreme. Maintenance and prediction of the useful life of these components are technically challenging tasks and are even more daunting when approached from a materials perspective. The future paradigm for maintaining the USAF systems is condition-based maintenance (CBM), which demands rigorous and rapid maintenance, repair, and replacement decisions and accurate prognosis (see Session 1 for a summary of prognosis) at the fleet level. Since the failure or inability of a component to perform its function begins at the material level, successful implementation of CBM hinges on incorporating materials state awareness concepts. The field of CBM is filled with researchers from crosscutting disciplines; besides understanding the science and technology, grasping the terminology itself is often challenging. A number of experts from around the country were invited by the National Materials Advisory Board and a workshop organizing panel chaired by Professor Edgar Starke to discuss issues pertaining to materials state awareness. The following are some of the objectives to which this workshop should contribute: (1) obtain an understanding of the concept of materials state awareness (MSA) in the context of CBM, (2) identify methods to assess MSA, (3) identify issues and challenges associated with the incorporation of MSA into future sustainment and prognosis, and (4) if possible, generate elements of a roadmap that will help with the incorporation of materials science concepts into CBM strategies. 1

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In order to ensure effective military operations and continued warfighter safety, the functionality and integrity of the equipment used must also be ensured. For the past several years, the Nondestructive Evaluation Branch at the Air Force Research Laboratory (AFRL) has focused actively on the development of embedded sensing technologies for the real-time monitoring of damage states in aircraft, turbine engines, and aerospace structures. These sensing technologies must be developed for use in environments ranging from the normal to the extreme, confronting researchers with the need to understand issues involving reliability, wireless telemetry, and signal processing methods. Additionally, there is a need to develop science and technology that will address the sensing of a material state at the microstructure level, precursor damage at the dislocation level, and fatigue-crack size population. To address these issues, the National Research Council convened a workshop at which speakers gave their personal perspectives on technological approaches to understanding materials state and described potential challenges and advances in technology. This book consists primarily of extended abstracts of the workshop speakers' presentations, conveying the nature and scope of the material presented.

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