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Dennis J. Buchanan

Division Head, Structural Materials

University of Dayton Research Institute: Structural Materials

Contact

Email: Dennis Buchanan
Phone: 937-229-4417
Website: Visit Site
Shroyer Park Center, RM 1230

Profile

Dr. Dennis Buchanan has over 25 years of experience in characterization of mechanical behavior of advanced structural materials. His most recent activity is investigation of relaxation of surface and bulk residual stresses in turbine engine components. He developed a coupled creep-plasticity constitutive model that incorporates residual stress and the plastic deformation associated with shot peening to predict residual stress relaxation in nickel-base superalloys. His other duties include material characterization and modeling of advanced aerospace materials such as nickel-base and titanium-base alloys, high temperature composite materials (CMC, MMC), and structural TPS materials subject to mechanical and thermal loading histories.

Dr. Buchanan is also involved in development and implementation of new experimental techniques. He has designed and tested several new fatigue initiation and crack growth geometries, which have been extracted from retired components. He also provides technical expertise in hardware design, software design and development, system integration, and implementation in support of advanced high-temperature test requirements. He has developed software and test techniques in the areas of experimental mechanics for automated material testing, specifically applicable to elevated temperature structures.

Research

Dr. Buchanan’s recent and current research interests include the following:

  • Relaxation of residual stresses under sustained and cyclic loading in turbine engine alloys
  • Plasticity and creep modeling of nickel-based superalloys for gas turbine engines
  • Life prediction models for damage tolerant design
  • Development of life prediction codes and damage models in advanced turbine engine allloy materials
  • Development and implementation of new experimental techniques for advanced mechanical testing

In addition, Dr. Buchanan oversees UDRI's Structural Materials division, which conducts the following research:

Education

  • Ph.D., Mechanical Engineering, University of Dayton
  • M.S., Engineering Mechanics, University of Wisconsin-Madison
  • B.S., Engineering Mechanics, University of Wisconsin-Madison

Affiliations

  • ASTM International
  • The Minerals, Metals, & Materials Society (TMS)

Selected Publications

  • Buchanan, D.J., and John, R., “Effect of Large Plastic Strains and Strain Gradients on Residual Stress Relaxation in Shot Peened IN100,” 13th International Symposium, Superalloys 2016, Champion, PA, 11-15 September 2016.
  • Parthasarathy, T.A., Porter, W.J., Buchanan, D.J., and John, R., "Development of a microstructure-sensitive design tool for high temperature strain rate sensitive flow stress of IN100 Ni-base superalloy", Material Science and Engineering A, 661, 2016, pp. 247-253.
  • Buchanan, D.J., and John R., “Residual Stress Redistribution in Shot Peened Samples Subject to Mechanical Loading,” Material Science and Engineering A, 615, 2014, pp. 70-78.
  • Buchanan, D., Shepard, M., and John, R., “Retained Residual Stress Profiles in Laser Shock-peened and Shot-peened Nickel Base Superalloy Subject to Thermal Exposure,” International Journal of Structural Integrity, Vol. 2, No. 1, 2011, pp. 34-41.
  • John, R., Buchanan, D., Caton, M., and Jha, S., “Stability of Shot Peen Residual Stresses in IN100 Subjected to Creep and Fatigue Loading,” Procedia Engineering, (2), 2010, pp. 1887-1893.
  • Buchanan, D. J., John, R., and Brockman, R. A., “Relaxation of Shot-Peened Residual Stresses Under Creep Loading,” ASME Journal of Engineering Materials and Technology, Vol. 131, July 2009.
  • Buchanan, D.J., John, R., and Zawada, L.P., “Off-axis Creep Behavior of Oxide/Oxide Nextel720/AS-0,” Composites Science and Technology, Vol. 68, 2008, pp. 1313-1320.
  • Golden, P., Buchanan, D., and Naboulsi, S., “Influence of Residual Stresses on Fretting Fatigue Life Prediction in Ti-6Al-4V,” 7th International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics, Tampa, FL, 14-16 November 2007.
  • Buchanan, D. J., John, R. and Ashbaugh, N. E., “Thermal Residual Stress Relaxation in Powder Metal IN100 Superalloy,” Journal of ASTM International, Vol. 3, No. 5, March 2006.
  • John, R., and Buchanan, D. J., “Bridging Stress Distributions During Fatigue Crack Growth in Continuously Reinforced [0] Metal Matrix Composites,” J. Composites Technology & Research, Vol. 23, No. 2, 2001, pp. 69-81.
  • John, R., Buchanan, D. J., and Larsen, J. M., “Prediction of Transverse Fatigue Behavior of Unidirectionally Reinforced Metal Matrix Composites,” Scripta Materialia, Vol. 39, No. 11, 1998, pp. 1529-1536.
  • Buchanan, D. J., John, R., and Johnson, D. A., “Determination of Crack Bridging Stresses from Crack Opening Displacement Profiles,” International Journal of Fracture, Vol. 87, No. 2, 1997, pp. 101-117.
  • Hartman, G.A., Ashbaugh, N.E., and Buchanan, D.J., “A Sampling of Mechanical Test Automation Methodologies Used in a Basic Research Laboratory,” Automation in Fatigue and Fracture: Testing and Analysis, ASTM STP 1231, C. Amzallag, Ed., American Society for Testing and Materials, 1994, pp. 36-50.
  • Buchanan, D. J., John, R., Stubbs, D. A., Benson, D. M., and Karpur, P., “Ultrasonic Longitudinal and Surface Wave Methods for In Situ Monitoring of Damage in Metal Matrix and Ceramic Matrix Composites,” Symposium on Nontraditional Methods of Sensing Stress, Strain, and Damage in Materials and Structures, ASTM STP 1318, George F. Lucus and David A. Stubbs, eds., American Society for Testing and Materials, Philadelphia, PA, 1986, pp. 173-186.