Nanomechanics

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Johanns

Kurt E. Johanns PhD.

Director of Lab Services

Kurt Johanns obtained his BS in Chemical Engineering from Tennessee Technological University in 2005. He then worked at Oak Ridge National Laboratory in the Ceramic Science and Technology group before starting graduate work at the University of Tennessee under Prof. George M. Pharr. Kurt received his Ph.D. in Materials Science and Engineering in 2014 with the topic of finite element modeling of indentation cracking in brittle materials. He then traveled to Darmstadt, Germany to work with Prof. Dr. Karsten Durst as a postdoc on the mechanical testing of borosilicate glasses and other small-scale mechanics problems. Kurt recently joined Nanomechanics, Inc. in August 2015 as Director of Analytical Services.

Kurt has experience testing and modeling a diverse range of materials and is well versed in topics including: ceramic armor, amorphous silicates, strain-rate sensitivity of BCC metals, and cohesive zone finite element modeling.

Publications

  • K. E. Johanns, J. H. Lee, Y. F. Gao, and G. M. Pharr. An Evaluation of the Advantages and Limitations in Simulating Indentation Cracking with Cohesive Zone Finite Elements, Mod. and Sim. in Mat. Sci. and Eng. (2014).
  • K. E. Johanns, A. Sedlmayr, P. Sudharshan Phani, R. Mönig, O. Kraft, E. P. George, and G. M. Pharr. In-Situ Tensile Testing of single- crystal molybdenum-alloy fibers with various dislocation densities in a scanning electron microscope, JMR (2012).
  • P. Sudharshan Phani, K. E. Johanns, G.Duscher, A. Gali, E. P. George, and G. M. Pharr. Scanning Transmission Electron Microscope Observations of Defects in as-grown and pre-strained Mo-alloy fibers, Acta. Mat. (2011).
  • A. A. Wereszczak and K. E. Johanns. Spherical Indentation of SiC, Adv. Cer. Armor II (2008).
  • A. A. Wereszczak, K. E. Johanns, and O. M. Jadaan. Hertzian Ring Crack Initiation in Hot-Pressed Silicon Carbides, JACerS (2009).
  • E. G. Herbert, K. E. Johanns, R. S. Singleton, and G. M. Pharr. On the Measurement of Energy Dissipation Using Nanoindentation and the Continuous Stiffness Technique, JMR (2013).
  • P. Sudharshan Phani, K. E. Johanns, E. P. George, and G. M. Pharr. A Simple Stochastic Model for Yielding in Specimens with a Limited Number of Dislocations, Acta. Mat. (2012).
  • P. Sudharshan Phani, K. E. Johanns, E. P. George, and G. M. Pharr. A Stochastic Model for the Size Dependence of Spherical Indentation Pop-In, JMR (2013).
  • J. H. Lee, Y. F. Gao, K. E. Johanns, and G. M. Pharr. Cohesive Interface Simulations of Indentation Cracking as a Fracture Toughness Measurement Method for Brittle Materials, Acta. Mat. (2011).
  • O. M. Jadaan, A. A. Wereszczak, K. E. Johanns, and W. L. Daloz. Weibull Effective Area for Ring Crack Initiation, Int. J. App. Cer. Tech. (2010).
  • M. Sebastiani, K. E. Johanns, E. G. Herbert, E. Bemporad,F. Carassiti, and G. M. Pharr. A Novel Pillar Indentation Splitting Test for Measuring Fracture Toughness of Thin Ceramic Coatings, Phil. Mag (2015).
  • M. Sebastiani, K. E. Johanns, E. G. Herbert, and G. M. Pharr. Measurement of Fracture Toughness by Nanoindentation Methods: Recent Advances and Future Challenges, Current Opinion in Solid State and Materials Science (2015).
  • E. G. Herbert, P. Sudharshan Phani, and K. E. Johanns. Nanoindentation of Viscoelastic Solids: A Critical Assessment of Experimental Methods, Current Opinion in Solid State and Materials Science (2015).
  • P. Malchow, K. E. Johanns, D. Möncke, S. Korte-Kerzel, L. Wondraczek, and K. Durst. Composition and Cooling-Rate Dependence of Plastic Deformation, Densification, and Cracking in Sodium Borosilicate Glasses during Pyramidal Indentation, J. Non-Cryst. Sol. (2015).