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Material state changes as a basis for prognosis in aeronautical structures

Published online by Cambridge University Press:  03 February 2016

K. L. Reifsnider ,
P. Fazzino ,
P. K. Majumdar  and
L. Xing
K. L. Reifsnider
Affiliation:
reifsnid@cec.sc.edu, Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina, USA
P. Fazzino
Affiliation:
reifsnid@cec.sc.edu, Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina, USA
P. K. Majumdar
Affiliation:
reifsnid@cec.sc.edu, Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina, USA majumdap@cec.sc.edu
L. Xing
Affiliation:
Edison International, Boston, Massachusetts, USA
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Abstract

The long-term performance of aeronautical structures is typically discussed in terms of concepts such as structural integrity, durability, damage tolerance, fracture toughness, etc. These familiar concepts are usually addressed by considering balance equations, crack growth relationships, and constitutive equations with constant material properties, and constant or cyclically applied load conditions. Loading histories are represented by changing stress (or strain) states, only. But for many situations, especially associated with high performance aircraft, the local state of the material may also change during service, so that the properties used in those equations are functions of time and history of applied conditions. For example, local values of stiffness, strength, and conductivity are altered by material degradation to create ‘property fields’ that replace the global constants, and introduce time and history into the governing equations. The present paper will examine a small set of such problems and offer a construct for using related solutions to estimate future performance based on history of use and current material state, a concept typically called prognosis.

Type
Research Article
Information
The Aeronautical Journal , Volume 113 , Issue 1150: Flight structures fundamental research in the United States of America: A Special Issue – PART II , December 2009 , pp. 789 - 798
Copyright
Copyright © Royal Aeronautical Society 2009 

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