FROM NDE WITH A Q TO SHM AND BEYOND

Journal Article · Tue Mar 03 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3114257· OSTI ID:21260290

Achenbach, J D ^[1]

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1. Center for Quality Engineering and Failure Prevention, Northwestern University Evanston, IL 60208 (United States)

In the nineteen-sixties, a significant limitation of NDI and NDE became apparent with the advent of fracture mechanics. Fracture mechanics requires quantitative information on defects, which has to be obtained from quantitative non-destructive testing. A DARPA Program directed by Don Thompson provided the point of departure for the journey to put the Q with NDE. The DARPA Program, and subsequent DOD, FAA and industrial programs produced seminal results for diagnostics and prognostics. In diagnostics, measurement models, probability of detection considerations and techniques of defect characterization were developed, which were complemented by damage evolution laws, probabilistic failure analysis and damage progression estimates, for methods of prognostication. The new results in QNDE naturally led to the concept of structural health monitoring (SHM), whereby sensors are permanently installed on structures. An SHM system can provide on-demand (or continuous) information on the state of a structure, so that an assessment of the structural integrity can be made at any time, and timely remedial actions can be taken. In this paper, we review the development of QNDE towards SHM. Sensor development, data processing, materials engineering and solid mechanics play dominant roles in both the diagnostic and the prognostic components of SHM. A probabilistic approach is essential, as will be shown by examples of pre-crack fatigue damage, crack growth and optimization of an inspection schedule.

• OSTI ID: 21260290
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1096; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
CRACK PROPAGATION
CRACKS
DAMAGE
DATA PROCESSING
DEFECTS
FAILURES
FRACTURE MECHANICS
INSPECTION
NONDESTRUCTIVE TESTING
NUCLEAR POWER PLANTS
OPTIMIZATION
PLASMA DIAGNOSTICS
PROBABILISTIC ESTIMATION
PROBABILITY
SENSORS