Larry Butkus, Ph.D., P.E.
Education
- Ph.D., Mechanical Engineering, Georgia Institute of Technology, 1997
- M.S., Mechanical Engineering, University of Michigan, 1991
- M.A., International Affairs, University of Dayton, 1989
- S.B., Mechanical Engineering, Massachusetts Institute of Technology, 1985
Teaching Experience
Miami University
2021- Present
Sinclair Community College
2014
U.S. Air Force Academy
1992-94, 2001-04
Georgia Institute of Technology
1995-97
University of Colorado – Colorado Springs
1992-94
Professional Experience
Chief
USAF Airworthiness Office (AFLCMC/EZZ)
Wright-Patterson AFB, OH
Jan 20 - Aug 21
Technical Director
USAF Airworthiness Office (AFLCMC/EZZ)
Wright-Patterson AFB, OH
Sep 18 - Jan 20
Chief Engineer
Materials & Manufacturing Directorate (AFRL/RX)
Wright-Patterson AFB, OH
Dec 12 - Sep 18
Lead, Structural Materials Evaluation Team & Acting Chief, Materials Integrity Branch
Systems Support Division (AFRL/RXSA)
Wright-Patterson AFB, OH
Mar 07 - Dec 12
Deputy, U.S. Air Force Aircraft Structural Integrity Program (ASIP)
Flight Systems Engineering Division (ASC/ENF)
Wright-Patterson AFB, OH
Jun 04 - Feb 07
Investigator
Columbia Accident Investigation Board
Johnson Space Center, TX
Mar 03 - Aug 03
Chief, Materials Division & Assistant Professor
Department of Engineering Mechanics (USAFA/DFEM)
U.S. Air Force Academy, CO
Jul 01 - Jun 03
Program Management Lead, F118-GE-100 Engine Integrated Product Team
Propulsion Development Systems Office (ASC/LPB)
Wright-Patterson AFB, OH
Jun 99 - Jun 01
Lead Structures Engineer for Aging Aircraft
Structures Branch, Engineering Directorate (ASC/ENFS)
Wright-Patterson AFB, OH
Oct 97 - Jun 99
Graduate Teaching Assistant
Department of Mechanical Engineering
Georgia Institute of Technology
Dec 95 - May 97
Executive Officer & Assistant Professor
Department of Engineering Mechanics (USAFA/DFEM)
U.S. Air Force Academy, CO
Jul 93 - Aug 94
Instructor
Department of Engineering Mechanics (USAFA/DFEM)
U.S. Air Force Academy, CO
Jan 92 - Jul 93
Materials Research Engineer
Metals & Ceramics Division, Materials Laboratory (WRDC/MLLN)
Wright-Patterson AFB, OH
Feb 89 - Aug 90
Project Engineer
Systems Support Division, Materials Laboratory (AFWAL/MLSE)
Wright-Patterson AFB, OH
Jul 86 - Jan 89
Publications & Presentations
Book Chapter
- Butkus, L.M., Valentin, R.V., and Johnson, W.S., "Evaluation of Environmental Effects on Bonded Repair Systems Using Fracture Mechanics," in Advances in the Bonded Composite Repair of Metallic Airframe Structures, Elsevier Science B.V., Amsterdam, 2003.
Technical Reports
- "Material, Product Form, and Process Substitution Guidelines for Metallic Components," EZ-SB-13-001, Air Force Life Cycle Management Center, Wright-Patterson AFB, OH, Jan 2013.
- Babish, C.A. IV, Butkus, L.M., DeFazio, M.S, Reams, R.H., and Gaskin, J.A., "Summary of the 2009 Aircraft Structural Integrity Program (ASIP) Review," ASC-WP-TR-2009-5001, Aeronautical Systems Center, Wright-Patterson AFB, OH, Dec 2009.
- Babish, C.A. IV, Gonzalez, J.F., Butkus, L.M., DeFazio, M.S, and Reams, R.H., "Summary of the 2008 Aircraft Structural Integrity Program (ASIP) Review," ASC-WP-TR-2008-9011, Aeronautical Systems Center, Wright-Patterson AFB, OH, Dec 2008.
- Brausch, J.C., Butkus, L.M., Campbell, D., Mullis, T. and Paulk, M., "Recommended Processes and Best Practices for Nondestructive Inspection of Safety-of-Flight Structures," AFRL-ML-WP-TR-2009-4373, Air Force Research Laboratory, Wright-Patterson AFB, OH, Oct 2008.
- Brausch, J.C., and Butkus, L.M., "Investigation and Root Cause Analysis Guidelines," AFRL-ML-WP-TR-2007-4113, Air Force Research Laboratory, Wright-Patterson AFB, OH, Jan 2007.
- Columbia Accident Investigation Board, "Report of the Columbia Accident Investigation Board." Aug 2003.
- Butkus, L.M., Valentin, R.V., and Johnson, W.S., "Application of Fracture Mechanics to the Durability of Bonded Composite Joints," Federal Aviation Administration, DOT/FAA/AR-97/56, Final Report, May 1998.
- Butkus, L.M., "Thermomechanical Fatigue Behavior of a Silicon Carbide Fiber-Reinforced Calcium Aluminosilicate Glass-Ceramic Matrix Composite," WL-TR-92-4071 Clearance # ASC -92-2239, Wright Laboratories, Wright-Patterson AFB, OH, Nov 1992.
- Butkus, L.M., "An Evaluation of the Effects of 'Hand' Sanding and Plastic Media Blasting (PMB) on Graphite/Epoxy Composite Materials," WRDC-TR-90-4006, Wright Research and Development Center, Wright-Patterson AFB, OH, Mar 1990.
Refereed Journal Articles
- Lubke, K. A., Butkus, L.M., and Johnson W.S., "Effect of Environment on Fracture Toughness and Debond Growth of Aluminum FM®73/Boron-Epoxy Adhesively Bonded Joints," Journal of Composites Technology & Research, Vol. 23, Jan. 2001.
- Lubke, K.A., Butkus, L.M., and Johnson, W.S., "Environmental Effects on Bonded Graphite/Bismaleimide Structural Joints," in Composite Structures: Theory and Practice: ASTM STP 1383, American Society for Testing and Materials, West Conshohocken, PA, 2000.
- Butkus, L.M., Mathern, P.D., and Johnson, W.S., "Tensile Properties and Plane-Stress Fracture Toughness of Thin Film Aerospace Adhesives," The Journal of Adhesion, Vol. 66, 1998.
- Valentin, R.V., Butkus, L.M., and Johnson, W.S., "A Finite Element and Experimental Evaluation of Boron-Epoxy Doublers Bonded to Aluminum Substrates," Journal of Composites Technology & Research, Vol. 20, 1998.
- Johnson, W.S. and Butkus, L.M., "Considering Environmental Conditions in the Design of Bonded Structures: A Fracture Mechanics Approach," Int'l Journal of Fatigue & Fracture of Eng'r'g Mat'ls & Structures, Vol. 21, 1998.
- Butkus, L.M. and Holmes, J.W. and Nicholas, T., "Thermomechanical Fatigue of a Silicon Carbide Fiber-Reinforced Calcium Aluminosilicate Composite," Journal of the American Ceramic Society, Vol. 76, 1993.
- Butkus, L.M., Zawada, L.P., and Hartman, G.A., "Fatigue Test Methodology and Results for Ceramic Matrix Composites at Room and Elevated Temperatures," Cyclic Deformation, Fracture, and Nondestructive Evaluation of Advanced Materials: ASTM STP 1157, American Society for Testing and Materials, Philadelphia, 1992.
- Zawada, L. P., Butkus, L.M., and Hartman, G.A., "Room Temperature Tensile and Fatigue Properties of Silicon Carbide Fiber-Reinforced Aluminosilicate Glass," Journal of the American Ceramic Society, American Ceramic Society, Westerville, OH, Vol 74, No 11, 1991, pp. 2851-2858
Conference Proceedings
- Butkus, L.M., "USAF Response to Contemporary Materials & Manufacturing Challenges in Aircraft Structural Integrity," in 2016 Australian Defence Forces' Aircraft Structural Integrity Symposium (AASI16), Melbourne, Victoria, Australia, 16-18 Nov 2016. – Invited Keynote
- Butkus, L.M., Babish IV, C.A, DeFazio, M.S, Perkins, L.P., and Reams, R.H., "Material, Product Form, and Process Substitution Guidelines for Metallic Components," in Proceedings of the 2013 Aircraft Structural Integrity Program (ASIP) Conference, Bonita Springs, FL, 3-5 Dec 2013.
- Butkus, L.M., Gallagher, J.P., Berens, A.P., Malas, J.C, and Babish IV, C.A., "U.S. Air Force Efforts in Understanding and Mitigating the Effects of 'NDI Misses,'" in Durability and Damage Tolerance of Aircraft Structures: Metals vs. Composites: Proceedings of the 24th Symposium of the International Committee on Aeronautical Fatigue, Naples, Italy, 14-17 May 2007.
- Mazza, J.J., Guijt, C.B, Kelly, D.F., Jacobs, N.J., Greer, J.M., Gaskin, J.A., and Butkus, L.M., "Long-Term Performance of Bonded Composite Repairs to Metallic Aircraft Structure," in Proceedings of the 10th Aging Aircraft Conference, Palm Springs, CA, 16-19 April 2007.
- Gallagher, J.P., Butkus, L.M., Brausch, J.C, Babish IV, C.A., Malas, J.C, and Berens, A.P., "Demonstrating the Effectiveness of an Inspection System to Detect Cracks in Safety of Flight Structure," Proceedings of the 10th Aging Aircraft Conference, Palm Springs, CA, 16-19 April 2007.
- Butkus, L.M., Gaskin, A., Greer, J.M., Guijt, C.B, Jacobs, N.J., Kelly, D.F., and Mazza, J.J, "Residual Strength of Bonded Structural Repairs after 10 Years of Service," in Proceedings of the 2006 Aircraft Structural Integrity Program (ASIP) Conference, San Antonio, TX, 28-30 Nov 2006.
- Butkus, L.M., Gallagher, J.S., and Babish, C.A., "The U.S. Air Force’s Aircraft Structural Integrity Program (ASIP)," in Proceedings of the 2006 International Fatigue Congress, Atlanta, GA, May 2006. – Reviewed
- Butkus, L.M., Guijt, C.B, Mazza, J.J., and Stargel, D.S., "Selected U.S. Air Force Efforts in Bonded Repair of Aircraft Structures," in Creating New Opportunities for the World Economy, Proceedings of the 2006 SAMPE Symposium and Exhibition, Society for the Advancement of Material and Process Engineering, Covina, CA, 30 Apr 2006. – Reviewed
- Butkus, L.M., "Nondestructive Inspections: An Essential Component of Aircraft Structural Integrity," in Proceedings of the 2006 Air Force Nondestructive Inspection (NDI) Working Group Meeting, San Antonio, TX, 26 Feb 2006. – Invited
- Butkus, L.M., "Undetected Cracks: Structural Significance and Root Cause Investigations," Proceedings of the 2005 Aircraft Structural Integrity Program (ASIP) Conference, Memphis, TN, 30 Nov 2005.
- Butkus, L.M., "Proposed Changes to MIL-STD-1530, The ASIP Standard," Proceedings of the 2004 Aircraft Structural Integrity Program (ASIP) Conference, Memphis, TN, 1 Dec 2004.
- Butkus, L.M., and Fredell, R.S., "Preparation for Practice - A Variation on the Capstone Design Course," presented at the ASEE Rocky Mountain Regional Conference, Pueblo, CO, 6 Apr 2002.
- Johnson, W.S. and Butkus, L.M., "Bonded Joint Strength as a Function of Long Term Exposure and Adhesive Type," EURADH '98 and 1st World Congress on Adhesion, Garmisch-Partenkirchen, Germany, 6-11 Sep 98.
- Butkus, L.M. and Johnson, W.S., "Environmental Effects on Several Bonded Systems," Proceedings of the 1997 USAF Aircraft Structural Integrity Program Conference, San Antonio, TX, 2-5 Dec 1997.
- Butkus, L.M. and Johnson, W.S., "The Durability of Graphite-Bismaleimide Aerospace Composites Bonded Using a Modified Epoxy Adhesive," Proceedings of the American Society for Composites 12th Annual Technical Conference, Wayne State Univ., Detroit, MI, R. Gibson and G. Newaz, eds., Technomic Publishing, Lancaster, PA, 6-8 Oct 1997.
- Butkus, L.M. and Johnson, W.S., "Environmental Effects on the Mode I Fracture and Fatigue Behavior of Adhesive Bonds," Proceedings of the Third International Conference on Progress in Durability Analysis of Composite Systems (DURACOSYS’97), K.L. Reifsnider, D.A. Dillard, and A.H. Cardon, eds., Blacksburg, VA, 14-17 Sep 1997.
- Butkus, L.M., Valentin, R.V., and Johnson, W.S., "Durability Issues in Bonded Joint Design," Fatigue in New and Ageing Aircraft: Proceedings of the International Committee on Aeronautical Fatigue 19th Symposium, Edinburgh, Scotland, P. Poole, ed., Engineering Materials Advisory Services, Ltd., Warley, U.K., 16-20 Jun 1997, pp. 843-854.
- Butkus, L.M. and Johnson, W.S., "Environmental Effects on the Opening Mode Fracture Behavior of Boron-Epoxy/Aluminum Joints," Proceedings of the 11th Technical Conference of the American Society of Composites, Atlanta, GA, Oct 1996.
- Johnson, W.S. and Butkus, L.M. and Valentin, R., "Designing for Durability of Bonded Structures" Proceedings of the FAA-NASA Symposium on Continued Airworthiness of Aircraft Structures, Atlanta, GA, Aug 1996.
- Butkus, L.M. and Johnson, W.S., "Durability of Adhesively Bonded Joints," Proceedings of the 4th Annual USAF Aging Aircraft Conference, USAF Academy, CO, Jul 1996.
- Butkus, L.M., "Assessing Structural Integrity of Bonded Joints Using Fracture Mechanics," Proceedings of the 1995 Aircraft Structural Integrity Program (ASIP) Conference, San Antonio, TX, 28-30 Nov 1995.
- Fredell, R., Müller, R., Borsboom, C., and Butkus, L., "Bonded Repair of Multiple Site Damage with GLARE tm Fiber Metal Laminate Patches," Proceedings of the 1994 Aircraft Structural Integrity Program (ASIP) Conference, San Antonio, TX, 6-8 Dec 1994.
- Bridge, J.W. and Butkus, L.M., "Hands-On Laboratory Projects that Enhance Learning in Materials Engineering," Proceedings of the 1994 Conf. of the American Society of Engineering Education, Edmonton, Alberta, Jul 1994.
- Zawada, L.P., Pernot, J.J. and Butkus, L.M., "The Fatigue Behavior of Several Ceramic Matrix Composites," Proceedings of Fatigue '93, The 5th International Conference on Fatigue and Fatigue Threshholds, J.P. Bailon and J.I. Dickson, eds., Chameleon Press, Ltd., London, pp. 1307-1312, Montréal, Québec, Canada, 3-7 May 1993.
- Butkus, L.M., and Holmes, J.W., "Thermomechanical Fatigue of a Nicalon-Reinforced Calcium Aluminosilicate Glass-Ceramic," Ceramic Engineering and Science Proceedings, Proceedings of the 12th Annual Conference on Composites and Advanced Ceramics American Ceramic Society, Westerville, OH,, Vol 12, No. 13, pp. 7-10, 13 Jan 1992.
- Butkus, L.M., Zawada, L.P., and Hartman, G.A., "Fatigue Test Methodology and Results for Ceramic Matrix Composites at Room and Elevated Temperatures," 1992.Symposium on Cyclic Deformation, Fracture, and Nondestructive Evaluation of Advanced Materials; American Society for Testing and Materials (ASTM), San Antonio, TX, 12 Nov 1990.
- Zawada, L.P., Butkus, L.M., and Hartman, G.A., "Room Temperature Tensile and Fatigue Properties of Silicon Carbide Fiber-Reinforced Aluminosilicate Glass," Annual Sagamore Conference, U.S. Army, Plymouth, MA, 1-4 Oct 1990.
- Butkus, L.M., Zawada, L.P., and Hartman, G.A., "Room Temperature Tensile and Fatigue Properties of Silicon Carbide Fiber-Reinforced Ceramic Matrix Composites," Advanced Aerospace Materials/Processes Conference and Exhibition (AeroMat), ASM International, Long Beach, CA, 21-24 May 1990.
- Butkus, L.M., Meuer, G.D. and Behme, A.K., Jr., "Plastic Media Blast (PMB) Paint Removal from Composites," in Advanced Materials: The Challenge for the Next Decade, Proceedings of the 35th International SAMPE Symposium and Exhibition, G. Janicki, V. Bailey, and H Schjeldrup, eds., Society for the Advancement of Material and Process Engineering, Covina, CA, pp. 1385 - 1397, 4 Apr 1990.
- Zawada, L.P., Butkus, L.M. and Hartman, G.A., "Room Temperature Tensile and Fatigue Properties of Silicon Carbide Fiber-Reinforced Aluminosilicate Glass," in Ceramic Engineering and Science Proceedings, Proceedings of the 14th Annual Conference on Composites and Advanced Ceramics American Ceramic Society, Westerville, OH, Vol. 11, No. 9-10, pp. 1592-1606, 15 Jan 1990. – Best Paper Award
Other Publications
- Butkus, L.M. and Samuels, S., "Creating Discussion in the Classroom: More Than Just Asking Questions," USAFA Educator, Vol XII, Issue 2, Spring 2004
- Butkus, L.M., Lincoln, J.W., and Davidson, E.A., "Techno-Team Assesses Structural Health of Air Force's Aging Aircraft," The Exceptional Release: Journal of the Maintenance Officer Assoc., No. 73, pp 26-27, Spring 1999.
Invited Presentations/Panels
- "Are We Preparing Our Next Generation of Airworthiness Professionals?", panel session, Aircraft Airworthiness & Sustainment Conference, National Harbor, MD, April, 2019
- "Speed" – Executive Panel Session, Lockheed Martin Advanced Development Projects Independent Review – LMAIR, Fort Worth, TX, August 2017.