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Robert Winholtz

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Robert Winholtz

Robert Winholtz, Associate Professor

Mechanical and Aerospace Engineering

Robert Winholtz Portrait

Biography

Robert A. Winholtz is an associate professor in the Mechanical and Aerospace Engineering Department and the Nuclear Engineering Program at the University of Missouri. A longtime research scientist at the University of Missouri Research Reactor, Winholtz is also familiar with synchrotron X-ray experimental facilities. His work has been funded by the Office of Naval Research, the National Science Foundation and NASA.

Education

PhD from Northwestern University in Illinois
MS and BS from the University of Nebraska

Technical Focus

Materials Science
X-ray Topography and Residual Stresses
Neutron Radiography

Publications

Book Chapters

  1. Residual Stresses: Macro and Micro Stresses, R.A. Winholtz, Encyclopedia of Materials:  Science and Technology, K.H.J. Buschow, R.W. Cahn, M.C. Flemings, B. Ilschner, E.J. Kramer, S. Mahajan, Eds., Pergamon, Oxford, 2001.
  2. Characterization of Macrostress, R.A. Winholtz, Analysis of Residual Stress by Diffraction using Neutron and Synchrotron Radiation, M. Fitzpatrick and A. Lodini, Eds., Taylor and Francis, London, 2003.
  3. X-ray Stress Analysis, Jonathan D. Almer and Robert A. Winholtz, Handbook of Experimental Solid Mechanics, William N. Sharpe, Ed., Springer, New York, 2008.

Refereed Journals

  1. “Generalised Least-squares Determination of Triaxial Stress States by X-ray Diffraction and the Associated Errors,” R.A. Winholtz and J.B. Cohen, Australian Journal of Physics, 41, 189-99, 1988.
  2. “On the Thickness of G.P. Zones in Al-Cu Alloys,” D.R. Haeffner, R.A. Winholtz, and J.B. Cohen, Scripta Metallurgica, 22, 1821-2, 1988.
  3. “Residual Stresses in a Two-Phase Microcracking Ceramics,” D.J. Magley, R.A. Winholtz, and K.T. Faber, Journal of the American Ceramic Society, 73, 1641-44, 1990.
  4. “Load Sharing of the Phases in 1080 Steel During Low Cycle Fatigue,” R.A. Winholtz and J.B. Cohen, Metallurgical Transactions A, 23A, 341-354, 1992.
  5. “Changes in the Macrostresses and Microstresses in Steel with Fatigue,” R.A. Winholtz and J.B. Cohen, Materials Science and Engineering, A154, 155-163, 1992.
  6. “Heat Treatment for Stress Relieving,” Yuyi Lin and R.A. Winholtz, Springs, 33(1), 37-45, 1994.
  7. “Use of Position-Dependent Stress-Free Standards for Diffraction Stress Measurement,” A.D. Krawitz and R.A. Winholtz, Materials Science and Engineering, A185, 123-130, 1994.
  8. “The Relaxation of Residual Stresses with Post Weld Heat Treatment in a High Performance Weldment Measured with Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, Metallurgical Transactions, 26A, 1287-1295, 1995.
  9. “Corrections to Equations for Estimating the Counting Statistical Errors in Diffraction Stress Measurements,” R.A. Winholtz, The Journal of Applied Crystallography, 28, 590-593, 1995.
  10. “The Effect of Assuming the Principal Directions in Neutron Diffraction Measurement of Stress Tensors,” R.A. Winholtz and A.D. Krawitz, Materials Science and Engineering, A205, 257-258, 1996.
  11. “Relation of Elastic Strain Distributions Determined by Diffraction to Corresponding Stress Distributions,” A.D. Krawitz, R.A. Winholtz, and C. Weisbrook, Materials Science and Engineering, A206, 176-182, 1996.
  12. “Implications of Equilibrium on Principal Macrostresses Measured by Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, Materials Science and Engineering, A221, 33-37, 1996.
  13. “An Instrument for Stress Measurement using Neutron Diffraction,” D.A. Witte, A.D. Krawitz, R.A. Winholtz, R.R. Berliner, and M. Popovici, Journal of Neutron Research, 6, 217-232, 1998.
  14. “The Effects of Residual Macrostresses and Microstresses on Fatigue Crack Propagation,” J.D. Almer, J.B. Cohen, and R.A. Winholtz, Metallurgical and Materials Transactions A, 28A, 2127-2136, 1998.
  15. “Residual Stresses in Polycrystalline Diamond Compacts,” A.D. Krawitz, R.A. Winholtz, E.F. Drake, and N.D. Griffin, International Journal of Refractory Metals and Hard Materials, 17, 117-122, 1999.
  16. “The Measurement of Residual Macrostresses Using Neutrons,” A.D. Krawitz and R.A. Winholtz, Journal of Neutron Research, 7, 259-276, 1999.
  17. “Residual Stress and Stress Gradients in Polycrystalline Diamond Compacts,” J.W. Paggett, E.F. Drake, A.D. Krawitz, R.A. Winholtz, and N.D. Griffin, International Journal of Refractory Metals and Hard Materials, 20, 187-194, 2002.
  18. “Residual stresses in a bulk metallic glass–stainless steel composite,” C.C. Aydıner, E. Ustundag, B. Clausen, J.C. Hanan,1, R.A. Winholtz, M.A.M. Bourke, A. Peker, Materials Science and Engineering A, 399A, 107–113, 2005.
  19. “Instrumentation for neutron scattering at the Missouri University Research Reactor,” P.F. Miceli, W. Montfrooij, H. Taub, K. Schoen, D.L. Worcester, and R.A. Winholtz, Transactions of the American Nuclear Society, 92, 174, 2005.
  20. “Strain-induced deformation in magnesia-alumina layered composites,” C.S. Kim, S.J. Lombardo, and R.A. Winholtz, Journal of the American Ceramic Society, 88 (8): 2064-2070, 2005.
  21. “Effect of Processing on the Microstructure and Induced-Strain Mismatch in Magnesia–Alumina-Layered Composites,” C.S. Kim, S.J. Lombardo and R.A. Winholtz, Journal of the American Ceramic Society, 89 (9) 2718–2725, 2006.
  22. “Visual Observation of Oscillating Heat Pipes Using Neutron Radiography,” C. Wilson, B. Borgmeyer, R. A. Winholtz, H. B. Ma, D. L. Jacobson, D. S. Hussey, M. Arif, AIAA Journal of Thermophysics and Heat Transfer, 22, 366-372, 2008.
  23. “Experimental Investigation of Miniature Three-Dimensional Flat-Plate Oscillating Heat Pipe,” S.M. Thompson, H.B. Ma, R.A. Winholtz, and C. Wilson, ASME Journal of Heat Transfer, 131, 043210, 2009.
  24. “Heat Transport Capability and Fluid Flow Neutron Radiography of Three-Dimensional Oscillating Heat Pipes,” B. Borgmeyer, C. Wilson, R.A. Winholtz, H.B. Ma, D. Jacobson, and D. Hussey, ASME Journal of Heat Transfer, 132, 1-7, 2010
  25. “Thermal and Visual Observation of Water and Acetone Oscillating Heat Pipes,” C. Wilson, B. Borgmeyer, R.A. Winholtz, H.B. Ma, D. Jacobson, and D. Hussey, ASME Journal of Heat Transfer, 133, 061502, 2011.
  26. “”I Know This is Supposed to be More Like the Real World, But . . .”: Student Perceptions of a PBL Implementation in an Undergraduate Materials Science Course,” H.R. Henry, A.A. Tawfik, D.H. Jonassen, R.A. Winholtz, and S. Khanna, Interdisciplinary Journal of Problem-based Learning, 6, 43-81, 2012.
  27. “Neutron phase volumetry and temperature observations in an oscillating heat Pipe,” I. Yoon, C. Wilson, B. Borgmeyer, R.A. Winholtz, H.B. Ma, D.L. Jacobson, and D.S. Hussey, International Journal of Thermal Sciences, 60, 52-60, 2012.
  1. “Thermal and visual observation of a hybrid heat pipe,” C.D. Smoot, H.B. Ma, R.A. Winholtz, D.L. Jacobson, and D.S. Hussey, Heat Transfer Research, 44, 31-42, 2013.
  2. “Study of the effects of liquid fraction and vapor volume on the fluctuating temperature in an oscillating heat pipe using neutron imaging,” I. Yoon, H.B. Ma, and R.A. Winholtz, Heat Transfer Research, 44, 43-57, 2013.
  3. “Effect of Hydrophilic Nanostructured Cupric Oxide Surfaces on the Heat Transport Capability of a Flat-Plate Oscillating Heat Pipe,” F.Z. Zhang, R.A. Winholtz, W.J. Black, M.R. Wilson, H. Taub, and H.B. Ma, Journal of Heat Transfer, 138, 062901-1, 2016.
  4. “Residual stress measurements via neutron diffraction of additive manufactured stainless steel 17-4 PH,” Mohammad Masoomi, Nima Shamsaei, Robert A. Winholtz, Justin L. Milner, Thomas Gnäupel-Herold, Alaa Elwany, Mohamad Mahmoudi, Scott M. Thompson, Data in Brief, 13, 408-414, 2017.
  5. “A neutron scattering and electron microscopy study of the structure, wetting, and freezing behavior of water near hydrophilic CuO-nanostructured surfaces,” J. Torres, Z.N. Buck, H. Kaiser, X. He, T. White, M. Tyagi, R.A. Winholtz, F.Y. Hansen, K.W. Herwig, and H. Taub, Journal of Applied Physics, 125, 025302, 2019.

Refereed Conference Proceedings/Papers

  1. “Separation of the Macro- and Micro-Stresses in Plastically Deformed 1080 Steel,” R.A. Winholtz and J.B. Cohen, Advances in X-ray Analysis, 32, 341-53, 1989.
  2. “Counting Statistical Errors in Principal Stresses and Directions Determined by Diffraction,” D.A. Witte, R.A. Winholtz, and S.P. Neal, Advances in X-ray Analysis, 37, 265-278, 1994.
  3. “Methods for Depth Profiling Complete Stress Tensors Using Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, Advances in X-ray Analysis, 37, 253-264, 1994.
  4. “Assessing the Validity of Diffraction Stress Measurements Using the Goodness-of-Fit Statistic,” T.A. Lohkamp and R.A. Winholtz, Advances in X-ray Analysis, 39, 281-289, 1997.
  5. “An Analysis of Macro- and Microstresses Around a Fatigue Crack Tip,” J.D. Almer, J.B. Cohen, W.D. Kirk, and R.A. Winholtz, Advances in X-ray Analysis, 39, 353-361, 1997.

Conference Proceedings/Papers

  1. “Internal Friction Damping in a Rapidly Solidified Al-Fe-Ce Powder Metallurgy Alloy,” R.A. Winholtz and W.N. Weins, Journal de Physique, C10, C10-375-8, 1985.
  2. “Fracture Properties of SiC-Based Particulate Composites,” K.T. Faber, W.-H. Gu, H. Cai, R.A. Winholtz, and D.J. Magley, in Proceedings of the NATO Advanced Research Workshop on Toughening Mechanisms in Quasi-Brittle Materials, S.P. Shah Ed., 3-17, Kluwer Academic Publishers, Dordrecht, 1991.
  3. “The Separation of Macrostresses and Microstresses,” R.A. Winholtz, Proceedings of the NATO Advanced Research Workshop on the Application of Neutron Diffraction to the Measurement of Residual and Applied Stresses, A. Krawitz and M. Hutchings Eds., 131-145, Kluwer Academic Publishers, Dordrecht, 1992.
  4. “Depth Probing of Stress Tensors Using Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, Proceedings of the Fourth International Conference on Residual Stresses, 14-23, Society for Experimental Mechanics, Bethel, CT (1994).
  5. “Neutron Stress Measurement of Triaxial Residual Stress Tensors in an Aerospace Weldment Before and After Post-Weld Heat-Treatment,” R.A. Winholtz and A.D. Krawitz, 4th International Conference on Trends in Welding Research, 93-97, ASM International, Materials Park, OH, 1996.
  6. “Measurement of Residual Stresses in a Large Weldment with Neutron Diffraction,” A.D. Krawitz and R.A. Winholtz, Proceedings of the 44th Defence Working Group on Nondestructive Testing, 265-278, 1995.
  7. “Residual Stresses in Bulk Metallic Glasses due to Differential Cooling or Thermal Processing,” E. Ustundag, B. Clausen, J.C. Hanan, M.A.M. Bourke, A. Winholtz, and A. Peker, in Bulk Metallic Glasses, W.L. Johnson, C.T. Liu, and A. Inoue (eds.), Materials Research Society, Warrendale, PA, MRS Symposium Proceedings, 554, 431-437, 1999.
  8. “The Growth Rate and Plastic Zone Size Variations of a Fatigue Crack Grown in a Tensile Residual Stress Field,” Y. Prawoto and R.A. Winholtz, Proceedings of the Eighth International Conference on Nuclear Engineering, American Society of Mechanical Engineers, paper 8785, 2000.
  9. “Residual Stress Measurement with High Energy X-rays at the Advanced Photon Source,” R.A. Winholtz, D.R. Haeffner, R.E.L. Green, R. Varma, and D. Hammon, Proceedings of the Sixth International Conference on Residual Stresses, IOM Communications, London, 1058-1060, 2000.
  10. “Analysis of the Effect of Tensile Residual Stress on Fatigue Crack Propagation,” Y. Prawoto and R.A. Winholtz, Proceedings of the Sixth International Conference on Residual Stresses, IOM Communications, London, 1477-1484, 2000.
  11. “Residual Stresses in Bulk Metallic Glasses and Composites,” E. Ustundag, C.C. Aydiner, D. Dragoi, B. Clausen, M.A.M. Bourke, and R.A. Winholtz, Proceedings of the Sixth International Conference on Residual Stresses, IOM Communications, London, 155-162, 2000.
  12. “Fatigue Crack Growth with Tensile Residual Stresses,” Y. Prawoto and R.A. Winholtz, Advances in Fracture Research, Proceedings of ICF10, Elsevier Science Ltd., Reference ICF100983OR, 2001.
  13. “Strain-Induced Forming of Ceramics Without the Application of External Pressure,” S. J. Lombardo, R. V. Shende, C. S. Kim, and R. A. Winholtz, Ceramic Transactions Vol. 154, Innovative Processing and Synthesis of Ceramics, Glasses, and Composites, VII, American Ceramic Society, Westerville, OH, 115-121, 2003.
  14. “High-Temperature Forming of Ceramic Shapes without Applying External Pressure,” S.J. Lombardo, R.V. Shende, C.S. Kim, and R.A. Winholtz, Ceramic Transactions Vol. 166, Innovative Processing and Synthesis of Ceramics, Glasses, and Composites, VIII, American Ceramic Society, Westerville, OH, 179-189, 2005.
  15. “Introducing Problem Based Learning in a Materials Science Course In the Undergraduate Engineering Curriculum”, H. Holly, D. Jonassen, A. Winholtz and S. K. Khanna, Proceedings ASME 2010 International Congress, Vancouver, Canada, Nov. 12-18, 2010.
  16. “Capstone Design as Cornerstone for Project-Based Learning throughout the Curriculum,” B. Hyman, R. Fales, Y. Lin, and A. Winholtz, Harvey Mudd Design Workshop VI, 2011.
  1. OEffectiveness of Introducing Problem Based Learning In The Undergraduate Engineering Curriculum, S. K. Khanna, R. A. Winholtz, D. Jonassen, A. Tawfik, H. Holly, Proceedings ASME 2012 International Congress, Houston, Texas, USA, Nov. 11-18, 2012.

Reports

  1. “Residual Stress and Diffraction Elastic Constants Measurement with a Personal Computer,” R.A. Winholtz, ONR Technical Report #27, July 1990.

Invited

  1. “The Separation of Macrostresses and Microstresses,” R.A. Winholtz, NATO Advanced Research Workshop, Oxford, U.K., March 18-22, 1991.
  2. “Depth Probing of Stress Tensors Using Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, International Conference on Residual Stresses, Baltimore, MD, June 8-10, 1994.
  3. “Characterization of the Stress State and Stress Relief in a High Performance Weldment Using Neutron Stress Measurements,” A.D. Krawitz and R.A. Winholtz, TMS Fall Meeting, Rosemont, IL, October 2-6, 1994. (Presented by A.D. Krawitz)
  4. “Measurement of Residual Stresses in a Large Weldment with Neutron Diffraction,” A.D. Krawitz and R.A. Winholtz, 44th Defense Working Group on Nondestructive Testing Conference, San Antonio, Texas, October 30-November 2, 1995.  (Presented by A.D. Krawitz)
  5. “Stress and Strain Determination in the Interior of Materials with Diffraction,” R.A. Winholtz, Special Presentation, Advanced Photon Source, Argonne National Laboratory, July 21, 1998.
  6. “Stress/Strain Determination with Diffraction,” R.A. Winholtz, National School on Neutron and X-ray Scattering, Argonne National Laboratory, August 25, 1999.
  7. “Neutron and High Energy Synchrotron X-ray Diffraction Studies of Residual Stresses in the Interior of Materials,” R.A. Winholtz and D.R. Haeffner, Eighth International Conference on Nuclear Engineering, Baltimore, Maryland, April 2-6, 2000.
  8. “Modeling Fatigue Crack Propagation in the Presence of Residual Stress,” R.A. Winholtz, 49th Annual Denver X-ray Conference on Applications of X-ray Analysis, Denver, Colorado, July 31-August 4, 2000.

Regular

  1. “Internal Friction Damping in a Rapidly Solidified Al-Fe-Ce Powder Metallurgy Alloy,” R.A. Winholtz and W.N. Weins, ICIFUAS-8, Urbana, Illinois, June 3-6, 1985.
  2. “Generalized Least-Squares Determination of Triaxial Stress States via X-ray Diffraction,” R.A. Winholtz and J.B. Cohen, AIME/TMS Winter Meeting, Phoenix Arizona, January 25, 1988.
  3. “Separation of the Macro- and Micro-Stresses in Plastically Deformed 1080 Steel,” R.A. Winholtz and J.B. Cohen, 37th Annual Denver Conference on Applications of X-ray Analysis, Steamboat Springs, Colorado, August 1-5, 1988.
  4. “Load Sharing by the Phases in 1080 Steel During Low Cycle Fatigue,” R.A. Winholtz and J.B. Cohen, AIME/TMS Fall Meeting, Detroit, Michigan, October 10, 1991.
  5. “The Effect of Residual Macro and Microstresses on the Fatigue of 1080 Steel,” R.A. Winholtz and J.B. Cohen, AIME/TMS Annual Meeting, New Orleans, Louisiana, February 17-21, 1991.
  6. “Counting Statistical Errors in Principal Stresses and Directions Determined by Diffraction,” D.A. Witte, R.A. Winholtz, and S.P. Neal, 42nd Annual Denver Conference on Applications of X-ray Analysis, Denver, Colorado, August 2-6, 1993. (Presented by D.A. Witte)
  7. “Methods for Depth Profiling Stress Tensors Using Neutron Diffraction,” R.A. Winholtz and A.D. Krawitz, 42nd Annual Denver Conference on Applications of X-ray Analysis, Denver, Colorado, August 2-6, 1993.
  8. “Neutron Stress Measurement of Triaxial Residual Stress Tensors in an Aerospace Weldment Before and After Post-Weld Heat-Treatment,” R.A. Winholtz and A.D. Krawitz, 4th International Conference on Trends in Welding Research, Gatlinburg, Tennessee, June 5-8, 1995.
  9. “An Analysis of Macro- and Microstresses Around a Fatigue Crack Tip,” J.D. Almer, J.B. Cohen, W.D. Kirk, and R.A. Winholtz, 44th Annual Denver Conference on Applications of X-ray Analysis, Colorado Springs, Colorado, July 31-August 4, 1995. (Presented by J.D. Almer)
  10. “Assessing the Validity of Diffraction Stress Measurements Using the Goodness-of-Fit Statistic,” T.A. Lohkamp and R.A. Winholtz, 44th Annual Denver Conference on Applications of X-ray Analysis, Colorado Springs, Colorado, July 31-August 4, 1995. (Presented by T.A. Lohkamp)
  11. “The Neutron Stress Program at MURR”, A.D. Krawitz and R.A. Winholtz, Inaugural Meeting of VAMAS Technical Working Area on Measurement of Residual Stress, Grenoble, France, January 9-10, 1996. (Presented by A.D. Krawitz)
  12. “Characterization of Residual Stresses in a Cylindrical Weld,” J. Hunt, A. Krawitz, and A. Winholtz, American Welding Society 77th Annual Convention, Chicago, IL, April 21-25, 1996.  (Presented by J. Hunt)
  13. “Modeling the Diffraction Average in Measurement of Microstresses,” R.A. Winholtz and A.D. Krawitz, 45th Annual Denver Conference on Applications of X-ray Analysis, Denver, Colorado, August 3-8, 1996.
  14. “Residual Stress Tensor Measurements: Issues and Implications,” A.D. Krawitz and R.A. Winholtz, Symposium on Nondestructive Evaluation and Materials Properties, TMS Fall Meeting, Cincinnati, Ohio, October 6-10, 1996. (Presented by A.D. Krawitz)
  15. “Neutron Detectors from Linear Position Sensitive Proportional Counter Arrays,” R. Berliner, D. Charlton, W.B. Yelon, A.D. Krawitz, R.A. Winholtz, Bjorn C. Hauback, Helmer Fjellfaag, O. Steinsvoll, Neutron Scattering, A Satellite Meeting to the XVII IUCr Congress, August 5-7, 1996. (Presented by R. Berliner)
  16. “Hardware and Software System Design for High Resolution Linear Position Sensitive Proportional Counter Detector Arrays,” R. Berliner, D. Charlton, W. B. Yelon, A. D. Krawitz, R. A. Winholtz, Bjorn C. Hauback, Helmer Fellfaag, and O. Steinsvoll, Proceedings of the International Workshop on Data Acquisition Systems for Neutron Experimental Facilities, Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, June 2-4, 1997. (Presented by R. Berliner)
  17. “Aspects of Neutron Diffraction Triaxial Stress Tensor Measurement,” R.A. Winholtz and A.D. Krawitz, The Fifth International Conference on Residual Stresses, Liköping Sweden, June 16-18, 1997.
  18. “X-Ray Diffraction and Finite Element Study of Residual Stress Evolution During Fatigue Crack Propagation,” J.D. Almer, J.B. Cohen, K.D. McCallum, and R.A. Winholtz, The Fifth International Conference on Residual Stresses, Liköping Sweden, June 16-18, 1997. (Presented by J.D. Almer)
  19. “An Instrument for Stress Measurement Using Neutron Diffraction,” D.A. Witte, A.D. Krawitz, R.A. Winholtz, R.R. Berliner, and M. Popovichi, Liköping Sweden, June 16-18, 1997.
  20. “Residual Stresses in Polycrystalline Diamond Compacts,” A.D. Krawitz, R.A. Winholtz, E.F. Drake, and N.D. Griffin, Sixth International Conference on the Science of Hard Materials, Lanzarote, Spain, March 9-14, 1998.
  21. “Residual Stresses in Bulk Metallic Glasses due to Differential Cooling or Thermal Processing,” E. Ustundag, B. Clausen, J.C. Hanan, M.A.M. Bourke, A. Winholtz, and A. Peker, Fall Meeting of the Materials Research Society, Boston, MA, December 3, 1998. (Presented by Ersan Ustundag)
  22. “Residual Stresses in Bulk Metallic Glasses,” E. Ustundag, J.C. Hanan, V. Scruggs, B. Clausen, M.A.M. Bourke, R.A. Winholtz, and J.W. Richardson, 48th Annual Denver X-ray Conference, Steamboat Springs, Colorado, August 2-6, 1999. (Presented by Ersan Ustundag)
  23. “The Growth Rate and Plastic Zone Size Variations of a Fatigue Crack Grown in a Tensile Residual Stress Field,” Y. Prawoto and R.A. Winholtz, Eighth International Conference on Nuclear Engineering, Baltimore, Maryland, April 2-6, 2000.
  24. “Analysis of the Effect of Tensile Residual Stresses on Fatigue Crack Propagation,” Y. Prawoto and R.A. Winholtz, The Sixth International Conference on Residual Stresses, Oxford, UK, July 10-12, 2000.
  25. “Residual Stress Measurement with High Energy X-rays at the Advanced Photon Source,” R.A. Winholtz, D.R. Haeffner, R.E.L. Green, R. Varma, and D. Hammon, The Sixth International Conference on Residual Stresses, Oxford, UK, July 10-12, 2000.
  26. “Residual Stresses in Bulk Metallic Glasses and Composites,” E. Ustundag, D. Dragoi, C.C. Aydiner, B. Clausen, M.A.M. Bourke, R.A. Winholtz, The Sixth International Conference on Residual Stresses, Oxford, UK, July 10-12, 2000. (Presented by Ersan Ustundag)
  27. “Modeling Fatigue Crack Propagation In The Presence Of Residual Stress,” R.A. Winholtz, 49th Annual Denver X-ray Conference, Denver, Colorado, July 31-August 4, 2000.
  28. “Fatigue Crack Growth with Tensile Residual Stresses,” Y. Prawoto and R.A. Winholtz, The 10th International Conference on Fracture, Honolulu, HA, December 2-6, 2001.
  29. “Strain-Induced Forming Of Ceramics Without The Application Of External Pressure,” S.J. Lombardo, R.V. Shende, C.S. Kim, and R.A. Winholtz, American Ceramic Society, Nashville, TN, April 27-30, 2003.
  30. “High Temperature Forming Of Ceramic Shapes Without Applying External Pressure,” S.J. Lombardo, R.V. Shende, C.S. Kim, and R.A. Winholtz, 106th Annual Meeting of the American Ceramic Society, Indianapolis, IN, April 18-21, 2004.
  31. “Heat Transport Capability and Fluid Flow Neutron Radiography of a Three-Dimensional Oscillating Heat Pipes,” B. Borgmeyer, C. Wilson, R.A. Winholtz, H.B. Ma, D.L. Jacobson, D.S. Hussey, 2008 ASME Summer Heat Transfer Conference, August 10-14, Jacksonville, FL, USA.
  32. “Thermal and Visual Observation of Water and Acetone Oscillating Heat Pipes,” C. Wilson, B. Borgmeyer, R.A. Winholtz, H.B. Ma, D. L. Jacobson, D.S. Hussey, M. Arif, 2008 ASME Summer Heat Transfer Conference, August 10-14, Jacksonville, FL, USA.
  33. “Challenges of introducing problem-based learning in a materials science course in the undergraduate engineering curriculum,” H. Henry, D. Jonassen, R.A. Winholtz, and S. Khanna, ASME 2010 International Mechanical Engineering Congress & Exposition, November 12-18, 2010, Vancouver, Canada.
  34. “”We kind of got pushed off into the deep end”: PBL in undergraduate engineering,” H. Henry, D. Jonassen, R.A. Winholtz, and S. Khanna, Annual Meeting of the American Educational Research Association, April 9, 2011, New Orleans, LA.
  35. S. K. Khanna, R. A. Winholtz, D. Jonassen, A. Tawfik, H. Holly, Effectiveness Of Introducing Problem Based Learning In The Undergraduate Engineering Curriculum, Proceedings ASME 2012 International Congress, Houston, Texas, USA, Nov. 11-18, 2012.
  36. F. Zhang, R.A. Winholtz, W. J. Black, M.R. Wilson, H.B. Ma, D.S. Hussey, and D.L. Jacobson, Effect of Selective Placement of CuO Nanostructures in an Oscillating Heat Pipe Studied with Neutron Imaging, 2014 American Conference on Neutron Scattering, Knoxville, TN, June 3, 2014.
  37. I. Yoon, H. Peng, R.A. Winholtz, P.F. Pai, H.B. Ma, D.S. Hussey, and D.L. Jacobson, Use of Neutron Imaging to Study the Dynamics of Oscillating Heat Pipes, 10th World Conference on Neutron Radiography, Grindelwald, Switzerland, October 5-10, 2014.
  38. H.B. Ma, F. Zhang, R.A. Winholtz, The effect of hybrid hydrophobic and hydrophilic surfaces on heat transfer performance of an oscillating heat pipe, AIAA Aviation and Aeronautics Forum and Exposition, June 13-17, 2016.
  39. M. Masoomi, S.M. Thompson, N. Shamsaei, M. Frost, R.A. Winholtz, Predicting Residual Stress Formation in Direct Laser Deposited Ti-6Al-4V via Thermo-Mechanical Modeling, 2016 Annual International Solid Freeform Fabrication Symposium, Austin, Texas, August 8-10, 2016.
  40. Mohammad Masoomi, Aref Yadollahi, Scott Thompson, Nima Shamsaei, Robert Winholtz, Justin Milner, Assessment of Residual Stress in Selective Laser Melted 17-4 PH Stainless Steel via Numerical Modeling and Neutron Diffraction, Materials Science & Technology 2016, Salt Lake City, Utah, October 23-27, 2016.
  41. Andy Winholtz, Designing Group-based Writing Assignments for Problem-based Learning Course, WebCast presentation for The Center for the Integration of Research, Teaching, and Learning, CIRTL Network, Madison, WI, February 23, 2017. https://www.youtube.com/watch?v=paYXAupPMxk&t=15s
  42. J. Torres, X. He, T. White, Z.N. Buck, R.A. Winholtz, H. Kaiser, H. Taub, Characterization of Hydrophilic Cupric Oxide Nanostructures, Microscopy and Microanalysis 2017, St. Louis, Missouri, August 6-10, 2017.
  43. 43. J. Torres, Z. Buck, H. Kaiser, X. He, T. White, R. Winholtz, H. Taub, M. Tyagi, K.W. Herwig, E. Mamontov, L.L. Daemen, M. Kidder, F.Y. Hansen, Structure and Dynamics of Water Interacting with Hydrophilic, Nanostructured CuO Coatings, APS March Meeting 2019, Boston, Massachusetts. March 4-8, 2019.

Professional Activities

Professional Organizations

ASM International

The Minerals, Metals & Materials Society

Neutron Scattering Society of America

Professional Activities

  • Invited to participate in the NATO Advanced Research Workshop on the Application of Neutron Diffraction to the Measurement of Residual and Applied Stresses, Oxford, UK, March 18-22, 1991.  Activities included contributing a presentation and paper, participating in discussion groups, and reviewing another contributed paper.
  • Instructor for the workshop “Measurement of Strains by X-ray Diffraction Methods” at the 42nd Annual Denver Conference on Applications of X-ray Analysis, Denver, Colorado, August 2-6, 1993.
  • Instructor for the “Residual Stress Workshop by X-ray and Neutron Diffraction Methods” at the High Temperature Materials Laboratory, Oak Ridge National Laboratory, August 26 & 27, 1993.
  • Member of the Versailles Project on Advanced Materials and Standards, Technical Working Area-20 (Measurement of Residual Stress).  This international standards organization developed a set of international standards for neutron stress measurement.  February 1996 to September 2001.
  • Member of the SMARTS (Structural MAterials Research at Temperature and Stress) Instrument Team, Los Alamos LANSCE Facility, 1997 to 2005.
  • Member of the Los Alamos National Laboratory LANSCE Materials Program Advisory Committee, May 1998 to April 2003.
  • Member of the Advanced Photon Source Independent Investigator Proposal Review Panel, September 2000 to 2006.
  • Member of the International Steering Comittee for “Hard Synchrotron X-rays for Texture and Strain Analysis,” held at HASYLAB April 9-12 2003.
  • Member of the VULCAN Instrument Design Team for the Spallation Neutron Source, November 1999 to 2006.
  • National Research Council/US Air Force Office of Scientific Research Summer Faculty Fellowship spent at Kirtland Air Force Base, Albuquerque, NM, June 2 to July 25, 2003.  Project Title:  An Investigation of X-ray Topography to Examine Laser-Induced Damage in Materials.
  • Reviewer for the Oak Ridge National Laboratory Neutron Sciences Directorate user program, 2007 to 2010.
  • Biodesign lecturer, MU Biodesign and Innovation Program, 2007, 2009.
  • Editor, Artifacts: A Journal of Undergraduate Writing at the University of Missouri, December 2011 to December 2013.
  • Consulting Editor, Interdisciplinary Journal of Problem-based Learning, August 2012 to present.
  • Reviewer for the NIST Center for Neutron Research user program, 2014 to present.

Professional Experience

Associate Professor, Mechanical and Aerospace Engineering
University of Missouri-Columbia
September 1997 to present

Visiting Professor, Thai Nguyen University of Technology
Thai Nguyen City, Vietnam, June-July, 2011; December, 2012-January, 2013, June-July, 2015.
July-August, 2016

Visiting Scholar, Dalian Maritime University
Dalian, China, May-July, 2009.

Senior Research Scientist, University of Missouri Research Reactor
April 1998 to August 2008
Visiting Scientist, Argonne National Laboratory
July 1998, May-June 1999

Assistant Professor, Mechanical and Aerospace Engineering
University of Missouri-Columbia
August 1991 to August 1997

Research Scientist, University of Missouri Research Reactor
August 1991 to March 1998

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