Overview

Dr. Suresh Keshavanarayana (Raju) is a Professorand Chairperson of the Department of Aerospace Engineering, Wichita State University (WSU). He specializes in the area of solid mechanics and composites with emphasis on experimental work. His research interests include material characterization and allowable generation, fatigue behavior of fastener joints, damage resistance and tolerance of laminated and sandwich construction, indentation behavior, crashworthiness, failure mechanisms in heterogeneous media, high strain rate characterization of composite materials, cure characterization and modeling of composites, hyperelastic material characterization of honeycomb cores and elastomers. Some of the ongoing work includes development of micromechanics based hyperelastic models for honeycomb cores, thermo-elastic modeling of honeycomb core forming process to predict node bond failures and cell collapse bands, evaluation of embedding tubular sensors in laminated composites, dynamic testing of fastener joints, temperature and time dependent elasto-plastic characterization and modeling of thermoplastics, and experimental characterization of lamina property degradation

Information

Areas of Research Interest
  • Material Characterization and Modeling
    • Laminated Composites
    • Honeycomb Cores
    • Elastomers
    • Strain Rate Sensitivity
    • Fastener Joints
Areas of Teaching Interest

University Courses

AE 333 Mechanics of Materials 

AE 525 Flight Structures-I

AE 762 Airframe Analysis and Design

AE 832 Theory of Plates and Shells

AE 853 Advanced Mechanics of Composites

AE 936 Theory of Plasticity 

Workshops, Institutes, Professional Continuing Education and Short Courses Taught

  1. Composite Short Course for Engineers, Nov, 2006
  2. Composite Short Course for Engineers, Mar-Apr, 2008
  3. WIRED Grant -Composite Short Course for Engineers, Oct-Nov, 2008
  4. WIRED Grant -Composite Short Course for Engineers, Nov-Dec, 2008
  5. SAMPE Tutorial – Damage Resistance and Tolerance of Composites, SAMPE Fall Tech. Conf, Memphis, TN 2008
  6. SAMPE Tutorial – Damage Resistance and Tolerance of Composites, SAMPE Fall Tech. Conf, Wichita, KS 2009
  7. Composite Short Course for Engineers (Boeing Co), Jan, 2010
  8. WIRED Grant -Composite Short Course for Non-Engineers, Feb-Mar, 2010
  9. WIRED Grant –Adv. Composite Short Course for Engineers, Mar, 2010
  10. WIRED Grant -Composite Short Course for Engineers, Apr, 2010
  11. WIRED Grant -Composite Short Course for Non-Engineers, June, 2010
  12. SAMPE Tutorial – Damage Assessment in Composites, SAMPE Conf. & Exp. Seattle, WA 2010
  13. SAMPE Tutorial – Damage Assessment in Composites, SAMPE Fall Tech. Conf, Salt Lake City, Utah 2010
  14. WSU Continuing Education – Developed online course on Basic Composites, 2012
  15. WSU Continuing Education – Developed online course on Advanced Composites, 2014
  16. WSU Continuing Education – Advanced Mechanics of Laminated Composites course, Oct. 16-19, 2017, Gulfstream Aerospace, Savannah, GA
  17. WSU Continuing Education – Advanced Mechanics of Laminated Composites course, Oct. 14-18, 2019, Gulfstream Aerospace, Savannah, GA
  18. WSU Continuing Education – Advanced Mechanics of Laminated Composites course (Online), March. 14-18, 2022, Gulfstream Aerospace, Savannah, GA
  19. WSU Continuing Education – Composite Manufacturing Technology Safety Awareness (Online), Feb - May, 2022, Federal Aviation Administration.
Publications

Journal Articles and Book Chapters

  1. Md.T. Siddiqui* and  S. Keshavanarayana, “Scaling effects on the strain rate sensitivity of unidirectional and [+45/−45]s laminates under tensile loading,” Journal of Reinforced Plastics and Composites, https://doi.org/10.1177/07316844231198677, August 2023

  2. A Mahapatro, HM Hlaing, L Malladi, S Keshavanarayana, “Hybrid polymeric-metallic foams for bone tissue engineering scaffolds: mechanical properties and biofunctionality evaluations,” International Journal of Polymeric Materials and Polymeric Biomaterials, Published Online, October 2021, https://doi.org/10.1080/00914037.2021.1990058
  3. H Shahverdi Moghaddam, SR Keshavanarayana, D Ivanov, C Yang, AL Horner, “In-plane shear response of a composite hexagonal honeycomb core under large deformation–A numerical and experimental study,” Composite Structures, Vol.268, July 2021
  4. H Shahverdi Moghaddam, SR Keshavanarayana, C Yang, AL Horner, “Anisotropic hyperelastic constitutive modeling of in-plane finite deformation responses of commercial composite hexagonal honeycombs,” Journal of Sandwich Structures & Materials, February 2021, https://doi.org/10.1177/1099636221993860
  5. Yang, H.Shahverdi Moghaddam, S.R.Keshavanarayana, A.L.Horner, “An analytical approach to characterize uniaxial in-plane responses of commercial hexagonal honeycomb core under large deformations,” Composite Structures, Vol.211, March 2019
  6. R.Keshavanarayana, H. Shahverdi *, A. Kothare * , C. Yang, and J.Bingenheimer, “The effect of node bond adhesive fillet on uniaxial in-plane responses of hexagonal honeycomb core,” Composite Structures, Vol.175, May 2017
  7. Alok Menon*, Melvin Rafi*, Georg Schirmer*, Teresa Tran*, Jonathan Whitford*, Nita Yodo*, Yulia Kostogorova-Beller, Jim Steck, Animesh Chakravarthy, Suresh Keshavanarayana, “Measurement of Wing Deflections in Flexible Aircraft using the SansEC Smart Sensor,” IEEE Aerospace and Electronics Systems Magazine, Vol.32, Issue.10, December 2017
  8. John Tomblin, Lamia Salah, Suresh Keshavanarayana, Cindy Ashforth, Lessons Learned on Supportability and Repair of Composites In: Beaumont, P.W.R. and Zweben, C.H. (eds.), Comprehensive Composite Materials II. vol. 3, pp. 238–260. Oxford: Academic Press. August 2017
  9. Nassim Rahmani*, Bethany Willard*, Kevin Lease, Ephriem T. Legesse*, Seyed A. Soltani, and Suresh Keshavanarayana, “The effect of post-cure temperature on fiber/matrix adhesion of T650/Cycom 5320-1 using the micro-droplet technique,” Polymer testing, Vol.46, Sept. 2015
  10. Abumeri, F. Abdi, K.S. Raju, J. Housner, R. Bohner and A. McCloskey, “Cost Effective Computational Approach for Generation of Polymeric Composite Material Allowables for Reduced Testing,” Advances in Composite Materials - Ecodesign and Analysis, Brahim Attaf (Ed.), ISBN: 978-953-307-150-3, InTech, 
  11. Leemans S, Rohl P.J., Huang D, Abdi F, Surdenas J., and K., “Honeycomb Fuselage Panel Certification by Analysis,” SAMPE Journal, Vol.46. No.4, pp30-47, 2010
  12. Keshavanarayana, B.L. Smith, C. Gomez, F. Caido*, M. Shiao and M. Nuss, “Fatigue based Severity Factors for Shear Loaded Fastener Joints,” Journal of Aircraft, Vol.47, No.1, 2010.
  13. Abdi, J. Surdenas, D. Huang, G. Abumeri, N.  Munir, J. Housner, Raju Keshavanarayana, “Computational Approach Toward Advanced Composite Material Qualification And Structural Certification”, Chapter  (pp.137-163) in  Virtual Testing and Predictive Modeling for Fatigue and Fracture Mechanics Allowables, B. Farahmand (ed.) Springer Science+Business Media,LLC  2009, ISBN 978-0-387-95923-8
  14. Suresh Keshavanarayana and Manoj Varma Thotakuri, “Off-axis Compression Behavior of honeycomb core in WT-plane,” Int. J. Crashworthiness, Vol.14, No.2, April 2009, pp.173-181.
  15. S. Raju, B.L. Smith, C. Gomez, M. Shiao and M. Nuss, “The Fatigue Behavior of Fastener Joints,” SAE Int. J. Aerosp. 1(1):675:684, 2008
  16. S. Raju, B.L. Smith, J.S. Tomblin, K.H. Liew and J.C. Guarddon, “Impact Damage Resistance and Tolerance of Honeycomb Core Sandwich Panels,” Journal of Composite Materials, Feb 2008; vol. 42: pp. 385 - 412.
  17. S. Raju, S. Dandayudhapani and C.K. Thorbole, “Characterization of In-plane Shear Properties of Laminated Composites at Medium Strain Rates,” Journal of Aircraft, Vol.45, No.2, Mar-Apr 2008
  18. S. Raju and Mohan Ghimire, “Local Bending containment in Sandwich Panels with sub-surface Core Damage,” J.Reinf. Plastics and Composites, 2007, DOI: 10.1177/0731684408089862
  19. S. Raju and J. S. Tomblin, “Energy Absorption Characteristics of Stitched Composite Sandwich Panels”, Journal of Composite Materials, Vol.33, No.8, 1999, pp. 712-728.
  20. R.M.V.G.K. Rao, H.V. Shylaja Kumari and K. Suresh Raju, “Moisture Diffusion Behavior of T300-914C Laminates”, Journal of Reinforced Plastics and Composites, Vol. 14, May 1995, pp. 513-5211.

Papers in Conferences with Proceedings

  1. A.Bhasin*, S. Keshavanarayana, T. Maichan*, L. Gomez, G. Olivares, “Effects of Impact Damage on the Energy Absorption Capabilities of Composite Materials,” Proceedings of The American Society For Composites-38th  Technical Conference

  2. Akhil Bhasin*, Tanat Maichan*, Luis M. Gomez, Gerardo Olivares and Hooloomann Ramdial*, Suresh Keshavanarayana, “Low Velocity Impact on Composite Energy Absorbers: Experimental Analysis,” AIAA SciTech Forum, 23–27 January 2023 National Harbor, MD

  3. Akhil Bhasin, Suresh Raju Keshavanarayana, Tanat Maichan , Hooloomann Ramdial, Luis Manuel Gomez and Gerardo Olivares, “Effect of Manufacturing Defects on Composite Energy Absorbers: Experimental Analysis ,” ASC 35th Technical Conference, University of Arizona, Tuscon, AZ,  September 2022
  4. Akhil Bhasin, Suresh Raju Keshavanarayana, Luis Gomez, Aswini Kona Ravi, Brian P. Justusson, Gerardo Olivares, “Progressive Damage and Failure Analysis of Bonded Composite Joints at High Energy Dynamic Impacts,” ASC 34th Technical Conference, Georgia Institute of Technology, GA, September 2019
  5. Akhil Bhasin, Suresh Raju Keshavanarayana, “Parasitic Effects of Including Microwire Sensor Tube on In-Plane Compressive Strength of Carbon-Fiber Reinforced Polymeric Composite Laminates,” American Society of Composites, 34th Technical Conference, Georgia Institute of Technology, GA, September 2019
  6. Shahverdi, S.R.Keshavanarayana, A. Kothare, P. Teoh, C.Yang, A.L.Horner, “In-Plane Thermal Characterization of Fiberglass/Phenolic Honeycomb Core through an Experimental-Numerical Approach,” American Society of Composites, 33rd Technical Conference, Seattle, WA, Sept., 2018
  7. Adrian Gomez, Suresh Keshavanarayana, Luis Castillo, Aswini Kona, Akhil Bhasin, Jenna Pang, Matt Molitor, Mostafa Rassaian, “High Rate Testing of Composite Fastener Joints with and without Clamp-up,” American Society of Composites, 33rd Technical Conference, Seattle, WA, Sept., 2018
  8. Shahverdi Moghaddam*, S.R. Keshavanarayana, C. Yang, and A.L. Horner, “A Numerical and Experimental Approach to Characterize the Failure Modes of Hexagonal Cell Honeycomb Core Under In-Plane Loading,” American Society of Composites, 32nd Technical Conference, Purdue University, West Lafayette, Indiana, 23rd-25th Oct., 2017
  9. Shahverdi Moghaddam*, C. Yang, S.R. Keshavanarayana,  and A.L. Horner, “Analysis of In-Plane Mechanical Response of Hexagonal Honeycomb Core: Effect of Node Bond Adhesive and Proposed Analytical Method,” American Society of Composites, 32nd Technical Conference, Purdue University, West Lafayette, Indiana, 23rd-25th Oct., 2017
  10. Shahverdi Moghaddam*, S.R. Keshavanarayana, A. Kothare*, C. Yang, and A.L. Horner, “Experimental and Numerical Study on the Mechanical Response of Fiberglass/Phenolic Honeycomb Core under Uniaxial In-Plane Loading” SAMPE Seattle 2017, Seattle, WA, May 22-25, 2016
  11. Karuppiah, S. Keshavanarayana, K. K. Jones, A. Sriyarathne, “Predicting Stress Relaxation Behavior of Fabric Composites using Finite Element based Micromechanics Model,” SAMPE 2016, Long Beach, CA, May 23-26, 2016
  12. Caido, S. Keshavanarayana, “Effect of periodicity and Reverse Yielding on Cycling Loading of Notched Specimens,”28th ICAF Symposium, Helsinki, June 3-5, 2015.
  13. R. Talagani , F. Abdi, R. Keshavanarayana, “Honeycomb Progressive Failure Model Under Impact Loading Condition,” SAMPE 2015, Baltimore MD May 18-21, 2015
  14. Seyed A. Soltani, Suresh Keshavanarayana, Manoj T. Krishnamaraja, Akhil Bhasin, “Study Of Honeycomb Core Shear-Compression Properties During Autoclave Processing,” SAMPE Annual Conference and Exhibition, Seattle, WA, June 2014
  15. Seyed A. Soltani, Suresh Keshavanarayana, “Development Of Time-Temperature Viscosity Diagram For Effective Cure Monitoring Of Thermosetting Composite Materials,” SAMPE Annual Conference and Exhibition, Seattle, WA, June 2014
  16. F. Acosta, G. Olivares, S. Keshavanarayana, M. T. Siddiqui*, I.Echavarri, “Dynamic Material Characterization of Laminated Composite Materials – a Path for Test Method Development,” American Society for Composites, Annual Technical Conf., University of California San Diego, La Jolla, CA USA, Sept. 2014
  17. Seyed A. Soltani, Suresh Keshavanarayana, Akhil Bhasin, Manoj T. Krishnamaraja, and Fred Saremi, “Effect of Fabric Weave Type on Distortion of Flat Panels Made of Out –of –Autoclave Carbon-Fiber Epoxy Prepreg,” 45th International SAMPE Technical Conference - Wichita, KS Oct 21 - Oct 24, 2013
  18. Seyed A. Soltani, Suresh Keshavanarayana, Manoj T. Krishnamaraja, Akhil Bhasin, and Abhiruchika Sriyarathne “Effect of Post-Curing Temperature Variation on Mechanical Properties of Adhesively Bonded Composite Laminates,” 45th International SAMPE Technical Conference - Wichita, KS Oct 21 - Oct 24, 2013
  19. Seyed A. Soltani, Suresh Keshavanarayana, and Ephriem T. Legesse, “Experimental Data and Modeling of Cure Kinetics for an Out-Of-Autoclave Carbon-Fiber Epoxy Prepreg Cured at Different Staged Cure Cycles,” 45th International SAMPE Technical Conference - Wichita, KS Oct 21 - Oct 24, 2013
  20. Tareq Siddiqui and Suresh Keshavanarayana, “Scaling Studies on the Tensile Strain Rate Sensitivity of Laminated Composites,” 42nd SAMPE Fall Technical Conference, Salt Lake City, Utah, October 2010
  21. Chandrashekar K. Thorbole and Keshavanarayana S. Raju, “Investigation and Modification of Frequency Response Function using Digital Fourier Analysis for High Speed Dynamic Testing Facility,” 2009 ASME International Mechanical Engineering Congress and Exposition November 13-19, 2009, Lake Buena Vista, Florida, USA
  22. Suresh Keshavanarayana, J. Tomblin, P. Shyprykevich and C. Davies, “Damage Tolerance of Full-Scale Notched Sandwich Panels,” 41st SAMPE Fall Technical Conference, Wichita, KS, October 2009
  23. F. Acosta and Suresh Keshavanarayana, “Evaluation of Cubic Specimen for Compression Testing at Different Strain rates,” 41st SAMPE Fall Technical Conference, Wichita, KS, October 2009(refereed)
  24. Suresh Keshavanarayana and P. Nandakumar, “Rate Sensitivity of Fracture Toughness of Composite Laminates,” 41st SAMPE Fall Technical Conference, Wichita, KS, October 2009 (refereed)
  25. Suresh Keshavanarayana,Y.Tan and S. Elyas , “Load Rate Effects on the Crush Response of Laminated Corrugated Beams,” Accepted for presentation at 41st SAMPE Fall Technical Conference, Wichita, KS, October 2009(refereed)
  26. Leemans, P.J. Rohl, D.Huang, F. Abdi, J. Surdenas and Raju Keshavanarayana, “ Certification by Analysis: General Aviation Honeycomb Fuselage Panels,”  54th International  SAMPE Symposium and Exhibition, Baltimore, May 2009
  27. S. Raju, B.L. Smith, C. Gomez, M. Shiao and M. Nuss, “The Fatigue Behavior of Fastener Joints,” SAE 2008-01-2259, SAE General Aviation technical Conference, Wichita, KS, August 2008.
  28. F. Acosta and K.S. Raju, “ Strain Rate Effects on the Compressive Behavior of Composites,” American Society of Composites 22nd Technical Conference, Seattle, WA , September 2007
  29. S. Raju, J.S. Tomblin and J.F. Acosta, “ Damage Tolerance of Sandwich Panels under In-Plane Loads – Experiments,” The 10th Joint DOD/NASA/FAA Conference on Aging Aircraft, April 16-19, 2007, Palm Springs Convention Center, Palm Springs, California
  30. S. Raju and E. Dan-Jumbo, “Damage Tolerance and Durability of High Modulus Graphite/Epoxy Composite Laminates,” SAMPE Technical Conference, Dallas, TX Nov 2006
  31. S. Raju, C. K. Thorbole and S. Dandayudhapani, “Characterization of In-plane Shear Properties of Laminated Composites at High Strain Rates,” AIAA 2006-2258 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Confere1 - 4 May 2006, Newport, Rhode Island
  32. S. Raju and E.Dan-Jumbo,” Behavior of Single-Shear Double Fastener Joints under Fatigue Loading”, SAMPE Technical Conference, Seattle WA, November 2005
  33. S. Raju, J.S. Tomblin and K.W. Petzold, “Responses of Sandwich panels with Large notches under In-Plane Loads,” American Society of Composites 20th Technical Conference, Drexel University, PA August 2005
  34. J. Burnham, C.J. Baker and K.S. Raju, “Bearing Responses of Laminated Composites Joined Using Blind Rivets,” AIAA Student Conference – Midwest Region, Wichita State University, Spring 2005
  35. S.Raju, J.F. Acosta and E.Dan-Jumbo, “Durability of Honeycomb Core Sandwich Panels Under Extreme Environments,” SAMPE Technical Conference, San Diego, CA, November 2004.
  36. S. Raju, J.F. Acosta and J.S. Tomblin, “Open-Hole Compression behavior of Sandwich Panels with Thin Facesheets,” SAMPE 2004, Longbeach, CA, May 2004.
  37. Shyprykevich, J.S. Tomblin and K. Suresh Raju, “Testing and Non-Destructive Evaluation of Impact Damaged Structures,” ICCM-14, San Diego, CA, July 2003.
  38. Bert L. Smith, John S. Tomblin, S. Raju, K.H. Liew, A.K.M. Haque and Juan C. Guarddon, “Damage Tolerance of Honeycomb Sandwich Composite Panels,” SAE 2002-01-1537, General Aviation Technology Conference & Exhibition, April 2002, Wichita, KS, USA
  39. S. Raju and J. S. Tomblin, “ Damage Characteristics in Sandwich Panels subjected to Static Indentation using Spherical Indentors”, AIAA-2001-1189, 42nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 16-19 April 2001, Seattle, WA
  40. S. Raju and J. S. Tomblin., “ Energy Absorption in Stitched Composite sandwich Panels”, SAE 981202, Advances In Aviation Safety Conference & Exposition, April 1998, Daytona Beach, FL, USA, Society of Automotive Engineers, Inc.
Awards and Honors
  1. Dora Wallace Award for Excellence in Teaching, 2021
  2. Academy for Effective Teaching, Finalist, 2019
  3. Dora Wallace Award for Excellence in Research, 2018
  4. Academy for Effective Teaching, Finalist, 2017
  5. WSU Online Faculty Fellowship, 2014
  6. NASA award for “Turning Goals into Reality,” 2002
  7. NASA  “Group Achievement Award – AGATE Alliance Team,” 2001