NDLI: Structural Aging Monitoring via Web-Based Nondestructive Evaluation (NDE) Technology

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jeffrey, T. Fong William, F. Ranson Reginald, I. Vachon Pedro, V. Marcal
Copyright Year	2008
Abstract	To assist owners and operators in real-time on-site monitoring and damage assessment of aging structures, we propose an “aging structure monitoring system” using direct measurements and web-based transmission technology. Such a system from field detection of surface or subsurface cracks to computer modeling/analysis/verification of simulated fatigue crack growth with ultimate delivery of remaining life prediction, is designed to have four major components: (1) The system is capable of transmitting from the field via internet to the office computer direct measurement data that are being collected in the field by personnel using handheld optical scanners to read bar-code-like strain gages either laser bonded (permanent marking) or adhesively bonded to selected critical high stress areas of the surface of a structure. (2) The office computer has a customized database that stores not only relevant geometric and material property data with variability information, but also a history of prior loadings, cumulated strain (plastic) measurements and fatigue crack length or crack tip opening displacement measurements. Such database is constantly being updated and enhanced with variability estimates subsequent to an event on a continouus or periodic inspection basis. (3) Using a minimum of four commercially-available finite-element method (FEM) packages, e.g., ABAQUS, ANSYS, LS-DYNA, and MPAVE, a numerical simulation experiment is conducted on real time using a fracture mechanics and fatigue damage theory-based deterministic model and the direct measurement data. This model is capable of predicting remaining lives for selected future loading scenarios. (4) The results of the FEM simulations are verified via a web-based statistically designed experiment using DATAPLOT where an uncertainty-bounded estimate of the remaining lives of the structure for selected loadings is delivered in real time to the field for decision making. Significance and limitations of this web-based direct-measurement approach to fatigue modeling are discussed.
Sponsorship	Pressure Vessels and Piping
Starting Page	1565
Ending Page	1613
Page Count	49
File Format	PDF
ISBN	9780791848296
DOI	10.1115/PVP2008-61607
e-ISBN	0791838285
Volume Number	Volume 6: Materials and Fabrication, Parts A and B
Conference Proceedings	ASME 2008 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2008-07-27
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Statistical data analysis Fracture mechanics Sensitivity analysis Fatigue life modeling Structural robustness analysis Web-based nde Aging structures Aging monitoring system Engineering decision making Engineering safety Nde monitoring Finite element method Applied mechanics Real-time on-site monitoring Structural damage assessment Direct measurement Design of experiments Uncertainty analysis Analysis of variance Error propagation Computers Uncertainty Finite element methods Modeling Nondestructive evaluation Engineering mechanics Databases Lasers Displacement measurement Materials properties Robustness Engineering simulation Safety Fatigue life Damage assessment Computer simulation Decision making Optical scanners Inspection Fatigue Strain gages Fracture (materials) Stress Errors Simulation Experimental design Monitoring systems Internet Fatigue cracks Fatigue damage
Content Type	Text
Resource Type	Article

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