TDA Publications

3D Modeling of Arbitrary Cracking in Solids using Augmented Finite Element Method,” 15 January 2017, Composite Structures; M. Naderi and N. Iyyer.

Effect of Interface Properties on Transverse Tensile Response of Fiber-Reinforced Composites: Three-Dimensional Micromechanical Modeling,” 25 November 2016, Journal of Composite Materials; M. Naderi, N Apetre, and N. Iyyer.

Extended Isogeometric Analysis (XIGA) of Fatigue Life in Attachment Lug,” June 2016, Journal of Failure Analysis and Prevention; M. Naderi, S. Sarkar, M. Amiri, and N. Iyyer.

A three dimensional augmented finite element for modeling arbitrary cracking in solids,” January 2016, International Journal of Fracture; M. Naderi, J. Jung, Q. D. Yang.

The Second Law of Thermodynamics and Degradation of Materials,” 2015, Safety and Reliability of Complex Engineered Systems; M. Amiri, E. Lopez Droguett, N. Iyyer, and M. Naderi.

Damage Precursor Based Structural Health Monitoring and Damage Prognosis Framework,” 2015, Safety and Reliability of Complex Engineered Systems; E. Rabiei, E. López Droguett, M. Modarres, and M. Amiri.

Variable Amplitude Fatigue Life in VHCF and Probabilistic Life Predictions,” September 2015, 1st International Conference on Structural Integrity; Attilio Arcari, Nicole Apetre, Norman Dowling, Martin Meischel, Stefanie Stanzl-Tschegg, Nagaraja Iyyer, and Nam Phan.

Probabilistic Model of Mean Stress Effects in Strain-Life Fatigue,” September 2015, 1st International Conference on Structural Integrity; Nicole Apetre, Attilio Arcari, Norman Dowling, Nagaraja Iyyer, and Nam Phan.

Validation of Federal Aviation Administration AC-29-2C MG-15 for Structural Usage Credits,” August 2015, Federal Aviation Administration; Chang-Hee Hong, Douglas Algera, David Green, Ed DiCampli, and Harrison Chin.

Fatigue Failure Initiation Modeling in AA7075-T651 Using Microstructure-Sensitive Continuum Damage Mechanics,” August 2015, Journal of Failure Analysis and Prevention; M. Naderi, M. Amiri, N. Iyyer, P. Kang, and N. Phan.

Prediction of Fatigue Crack Nucleation Life in Polycrystalline AA7075-T651 using Energy Approach-Fatigue & Fracture of Engineering Materials“, July 2015, Fatigue & Fracture of Engineering Materials & Structures; M. Naderi, M. Amiri, N. Iyyer, P. Kang, and N. Phan.

“A continuum damage mechanics model for pit-to-crack transition in AA2024-T3,” July 2015, Corrosion Science; M. Amiri, A. Arcari, L. Airoldi, M. Naderi, and N. Iyyer.

“Gross Weight and Center of Gravity Estimation System for the V22,” May 2015, AHS 71st  Annual Forum; Chris Thaiss and Fred Caplan.

“Fatigue life prediction of cracked attachment lugs using XFEM,” March 2015, International Journal of Fatigue; M. Naderi and N. Iyyer.

“Analysis of Rotor Load Harmonic Composition and Load Transference Between Frames,” Aug 2013; (Portland, OR), ASME 2013 International Design Engineering Technical Conference/Computers and Information in Engineering; McColl, C. and Ruzzene, M.

“A Method for Application of Frequency Domain-based Load Sources to Full-scale Aircraft Fatigue Tests,” Jun 2013; (Bristol, UK), International Forum of Aeroelasticity & Structural Dynamics 2013; McColl, C. and Thaiss, C.

“Rotor Loads Prediction: A Matched-Harmonic Confluence Approach, with Application to 600+ UH-60A Flight Counters,” May 2013; (Phoenix, AZ), 69th AHS Conference;  McColl, C. and Ruzzene, M.

“Rotorcraft Real Time Damage Alleviation through Load Limiting Control”; January 2014; AIAA SciTech 2014; National Harbor, MD; C. Thaiss, C. McColl, J. Horn, E. Keller, A. Ray, R. Semidey, N. Phan.

“Innovative Methods to Estimate Rotorcraft Gross Weight and Center of Gravity”; July 2012; 6th European Workshop on Structural Health Monitoring Conference; Dresden, Germany; N. Apetre, S. Sarkar, N.  Iyyer, P. Kang, Nam Phan.

“Testing of Passive RFID Systems on Rotorcraft for Tracking Dynamic Components”; May 2012; Ft. Worth, TX; D. Algera, A. Singh, R. Owen, S. Mareedu, N. Iyyer, S. Bradfield, R. Semidey, J. Thomas, N. Phan.

“Fatigue Reliability Analysis for High Cycle Fatigue Regime”; April 2012; 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Honolulu, Hawaii; Nicole Apetre, Attilio Arcari, Subhasis Sarkar, Nagaraja Iyyer, Nam Phan, Peter Kang.

“Study of Load Sequence Effects in Combined Cyclic Fatigue using CDM Approach”; April 2012; 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Honolulu, Hawaii; S Sarkar, A. Arcari, N. Apetre, N. Iyyer, N. Phan, P. Kang.

“Influence of superimposed VHCF loadings in cyclic fatigue of 7075-T6 aluminum alloy”; April 2012; 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Honolulu, Hawaii; A. Arcari, N. Apetre, S. Sarkar, N. Dowling, N. Iyyer, S. Stanzl-Tschegg , N. Phan, P. Kang.

“Effects of Surface Renewal on Fatigue Crack Initiation and Growth of 7050 Aluminum Alloy”; April 2012; 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Honolulu, Hawaii; A. Arcari, N.Iyyer, N., Dunn, M., Barter, S. A.

“Analysis of fatigue crack growth in an attachment lug based on the weight function technique and the UniGrow fatigue crack growth model”; July 2011; International Journal of Fatigue; S. Mikheevskiy, G. Glinka, D. Algera.

“Novel Methods to Estimate Rotorcraft Weight and Center of Gravity for General Flight Conditions Using HUMS Data”; May 2011; 67th American Helicopter Society Forum; Virginia Beach, VA; N. Apetre, S. Sarkar, N. Iyyer, and N Phan.

“Rotorcraft Flight Visualization Using HUMS Data”; May 2011; 67th American Helicopter Society Forum; Virginia Beach, VA; Amit Singh, Mohit Iyyer, Nicole Apetre, Subhasis Sarkar, Nagaraja Iyyer, and Nam Phan

“Rotary Wing Structural Life Tracking Architecture”; May 2010; 66th American Helicopter Society Forum; Phoenix, AZ; D. Algera, N. Iyyer, C.H. Hong, S. Sarkar, A. Singh, S. Bradfield

“Comprehensive UH-60 Loads Model Validation”; May 2010; 66th American Helicopter Society Forum; Phoenix, AZ; C. McColl, D. Palmer, O. Bauchau (Georgia Tech), M. Ruzzene (Georgia Tech), M. Chierichetti (Georgia Tech).

“Combined Analytical and Experimental Approaches to Rotor Components Stress Predictions”; May 2010; The 1st Joint International Conference on Multibody System Dynamics; Lappeenranta, Finland; M. Chierichetti (Georgia Tech), C. McColl, D. Palmer, O. Bauchau (Georgia Tech), M. Ruzzene (Georgia Tech).

“Computer Simulation Evaluation of the P-3C Upper Wing Cover for Fatigue and Corrosion Using the Structural Area Inspection Frequency Evaluation (SAIFE) Program”; Dec 2009; Aircraft Structural Integrity Program Conference; Jacksonville, FL; A. Anderjaska.

“Airframe Trend Monitoring in General Aviation”; Sep 2009; The AutoPILOT (www.autopilotmagazine.com); C. McColl.

“Architecture for Dynamic Component Life Tracking in an Advanced HUMS, RFID, and Direct Load Sensor Environment”; Mar 2009; 13th Australian International Aerospace Congress; Melbourne, Australia; N. Iyyer, S. Bradfield, S. Sarkar, C. McColl, D. Algera, E. Flores (NAVAIR), N. Phan (NAVAIR).

“The Effects of Air Vehicle Health Monitoring System Fidelity on Fatigue and Damage Tolerance Assessments”; May 2009; 12th Joint FAA/DoD/NASA Conference on Aging Aircraft; Kansas City, MO; D. Palmer, R. Higa, C. McColl, T. Crosby (NAVAIR).

“Structural Life Management of Aging Aircraft – Deterministic and Probabilistic Metrics”; April 2008; 11th Joint FAA/DoD/NASA Conference on Aging Aircraft; Phoenix, AZ; N. Iyyer, R. Merrill, S. Bradfield, N. Phan (NAVAIR).

“A Template for Successful Development and Implementation of an Aircraft Life Tracking Program”; April 2008; 11th Joint FAA/DoD/NASA Conference on Aging Aircraft; Phoenix, AZ; C. McColl.

“Fleet Metrics: Aircraft Flight Data Collection and Analytics”; April 2008; 11th Joint FAA/DoD/NASA Conference on Aging Aircraft; Phoenix, AZ; T. Connell, C. McColl.

“PTEAMbase: A Program Management Tool to Capture the True Costs of Navy Corrosion”; December 2007; 2007 Tri-Service Corrosion Conference; Denver, CO; K. Thomas (SET, Inc.), J. Wegand (SET, Inc.), D. Meikle (NAVSEA), B. Brinckerhoff (NAVSEA), E.D. Thomas (NAVSEA), C. McColl (TDA).

“Measured Gust Cycle Clustering Effects and the Implications on Aircraft Fatigue and Damage Tolerance”; April 2007; 10th Joint FAA/DoD/NASA Conference on Aging Aircraft; Palm Springs, CA; C. McColl (TDA), N. Phan (NAVAIR).

“C-130 Usage/Environmental Criteria Analysis and Gust Loads Assessment”; November 2006; 2006 USAF Aircraft Structural Integrity Program Conference; San Antonio, TX; S. Moon (L-3/Titan), C. McColl (TDA), N. Phan (NAVAIR).

“Aircraft Life Management using Crack Initiation and Crack Growth Models – P-3C Aircraft Experience”; September 2006; 6th International Conference on Fatigue Damage of Structural Materials; Hyannis, MA; N. Iyyer, S. Sarkar, R. Merrill, N. Phan (NAVAIR).

“Risk Assessment of P-3C Aircraft”; March 2006;
9th Joint DoD/FAA/NASA Conference on Aging Aircraft; Atlanta, GA; N. Iyyer, S. Sarkar, R. Merrill, N. Phan (NAVAIR)

“The Effects of Extreme Weather Environments/Severe Flight Loads Spectra on the Aging Fleet of NOAA’s WP-3D Hurricane Hunter Aircraft”; March 2006; 9th Joint DoD/FAA/NASA Conference on Aging Aircraft; Atlanta, GA; C. McColl, S. Bradfield.

“The Effects of Degraded Data on the Performance of Health Usage Monitoring Systems (HUMS) in Rotary Wing Aircraft”; March 2006; 9th Joint DoD/FAA/NASA Conference on Aging Aircraft; Atlanta, GA; S. Sarkar, G. Barndt, S. Maley (NAVAIR).

“Durability Issues and Management of Aging P-3C Aircraft”; March 2005;
11th International Conference on Fracture; Turin, Italy; N. Iyyer, N. Phan (NAVAIR).

“The Influence of Extreme Weather Environments on Structural Health and Fatigue Life of WP-3D Aircraft”; July 2004; 2nd European Workshop on Structural Health Monitoring; Munich, Germany; C. McColl, S. Bradfield.

“Corrosion Assessment of Wing Fold Transmissions”; November 2003; 2003 Tri-Service Corrosion Conference; Las Vegas, NV; N. Iyyer, M. Kittur (NAVAIR).

“Gap-fill Methods for Estimating Fatigue Damage”; September 2003; Conference
Proceedings, 7th Joint DoD/FAA/NASA Conference on Aging Aircraft; N. Iyyer, N. Phan (NAVAIR).

“Comprehensive Web-Based Fatigue Analysis, Fleet Management, and Fatigue Test Tools for the P-3 Orion”; September 2003; Conference Proceedings, 7th Joint DoD/FAA/NASA Conference on Aging Aircraft; New Orleans, LA; C. McColl, T. Story.

“P-3C Crack Growth Life Predictions Under Spectrum Loading”;
May 2003; Poster Paper, 2003 International Committee on Aeronautic Fatigue (ICAF) Conference; N. Iyyer, Y. S. Kwon (Lockheed Martin), N. Phan (NAVAIR).

“Corrosion Assessment of Wing Fold Transmissions of a Fleet Fighter/Attack Aircraft”;
December 2002; Conference Proceedings, 2002 USAF Aircraft Structural Integrity Program Conference; N. Iyyer, M. Kittur (NAVAIR).

“Web-Based Fatigue Spectra Sequencing Application for the P-3 Orion”;
December 2002; Conference Proceedings, 2002 USAF Aircraft Structural Integrity Program Conference; Savannah, GA; C. McColl, R.P.G. Veul, N. Iyyer, D. Sherman, J.R.S. Graveline.