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8th European Workshop On Structural Health Monitoring (EWSHM 2016)
5-8 July 2016, Spain, Bilbao
Right Now in Bilbao 13:17 Thu 22
Fatigue monitoring for residual life-cycle assessment and maintenance17:30 Wednesday 6. Jul - C1
Damage Precursor Index (DPI) Methodology for Metallic Structures
Abstract »In this study, a Damage Precursor Index (DPI) methodology is proposed to track the evolution of fatigue damage precursors immediately after establishing the dynamic behavior of a structure. The DPI is used to measure the change in the state of fatigue damage precursors in structures exposed to vibration loads. The DPI is based on estimating the nonlinear dynamic parameters in isotropic materials prior to crack formation. The model accounts for the incubation and evolution of localized material microplasticity. Structural compliance due to the presence of the micro-plasticity is observed experimentally. The change in the dynamic response as a result of damage precursors is used to update the global dynamic parameters, which are used to calculate a corresponding DPI. The fatigue damage precursors are verified through series of macro/micromechanical characterizations of isotropic structures under vibration loads. The application of the DPI methodology to structural health monitoring systems may considerably improve health awareness in complex systems due to the addition of sensitivity to damage precursors.
Paper
Authors
Habtour, Ed*Habtour, Ed*ed.m.habtour.civ@mail.mil
410-278-2429
Biography:
Dr. Ed Habtour leads the Prognostics and Diagnostics (P&D) Team in the Vehicle Technology Directorate at the Army Research Laboratory. Ed focuses on developing mathematical and experimental techniques to predict the dynamics of healthy/unhealthy mechanical systems with emphasis on enhancing the health and reliability. Vehicles exhibiting nonlinear and/or stochastic behavior due to multiaxial dynamic loading are of particular interest. The objective is defeat failures by exploiting the interpalys between micromechanics and the system global behavior. Integrating physics of failure and sensing strategies into adaptive control algorithms are actively investigated to facilitate capturing fatigue damage precursors and embryonic cracks. This area includes the development of health-conscious structures with real-time control. Prior to joining ARL, Ed has held positions at the Space Dynamics Laboratory, Swales Aerospace, Northrop Grumman, and Army Materiel System Activity Analysis. He earned a BS in Mechanical Engineering from Utah State University. He also earned three MS degrees in Engineering from Johns Hopkins University, Purdue University, and University of Maryland. He completed his Mechanical Engineering Ph.D. at University of Maryland. Ed is a senior member of IEEE and Reliability Society, and a member of ASME, EMI, and SIAM. He has served in international technical committees and review panels for the National Science Foundation, American Society for Engineering Education, and various DoD Agencies. He published over 30 technical papers. He received several awards for his contributions in science and engineering.
Sciences-for-Maneuver CampaignHabtourAffiliation:
U.S. Army Research Laboratory
Vehicle Technology Directorate
21202 APG
USA
Other Presentations:
Wed 6. 09:50, A3A
Session: Aerospace structures: Modeling, Verification & Validation
Title: Fatigue crack quantification approach based on multi-path unit-cell concept in sensor network
PaperCole, DanielCole, Danieldaniel.p.cole.ctr@mail.mil
Affiliation:
U. S. Army Research Laboratory
Vehicle Technology Directorate
APG
USAKube, ChristopherKube, Christopher
christopher.m.kube.ctr@mail.mil
Affiliation:
U. S. Army Research Laboratory
Vehicle Technology Directorate
APG
USARobeson, MarkRobeson, Mark
mark.e.robeson.civ@mail.mil
+1 757-878-3029
Biography:
Dr. Mark E. Robeson is an Aerospace Engineer with the U.S. Army’s Aviation Development Directorate – Aviation Applied Technology Directorate (ADD–AATD) at Ft. Eustis. He has over 25 years of research and development experience with advanced aircraft structures. His current areas of specialization include advanced composite airframe structures, structural contributions to vulnerability reduction, and multifunctional structures.
Affiliation:
USADasgupta, AbhijitDasgupta, Abhijit
dasgupta@calce.umd.edu
Affiliation:
University of Maryland
Center for Advanced Life Cycle Engineering
College Park
USA*Contact
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