Areas of Research:

• 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 MMC, CMC, and monolithic materials
• Development and implementation of new experimental techniques for advanced mechanical testing

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., 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.

Buchanan, D. J., John, R., and Goecke, K. E., “Influence of Temperature and Stress Ratio on the Low-Cycle Fatigue Behavior of Trimarc-1/Ti-6Al-2Sn-4Zr-2Mo,” Composite Materials: Fatigue and Fracture, Seventh Volume, ASTM STP 1330, R. B. Bucinell Ed., 1998, pp. 199-216.

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.

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.