Joel Lefever

 


Phone Number: 215-898-4591
Email: lefever@seas.upenn.edu
Office: 112 Towne


Education

Ph.D., Materials Science and Engineering, University of Pennsylvania (Expected 2017)

M.Sc., Materials Science and Engineering, University of Pennsylvania (2015)

B.Sc., Mechanical Engineering, Lafayette College (2012)

Research Interests

Currently, I study stress-driven deformation mechanisms in disordered nanoparticle packings, which serve as a model system for metallic glasses and other amorphous materials. Techniques include nanoindentation using atomic force microscopy and in situ transmission electron microscopy. Quantitative mechanical properties as well as spatial imagery are accessible with both techniques.

Previous and ongoing research interests include nanotribology, biomechanics, and pedagogy.

Publications

  1. J.A. Lefever, T.D.B. Jacobs, Q. Tam, J.L. Hor, Y.-R. Huang, D. Lee, and R.W. Carpick. Heterogeneity in the small-scale deformation behavior of disordered nanoparticle packings. Nano Letters (2016) 16:2455-2462.
  2. T.D.B. Jacobs, J.A. Lefever, and R.W. Carpick. A technique for the experimental determination of the length and strength of adhesive interactions between effectively rigid materials, Tribology Letters (2015) 59:1.
  3. T.D.B. Jacobs, J.A. Lefever, and R.W. Carpick. Measurement of the length and strength of adhesive interactions in a nanoscale silicon-diamond interface, Advanced Materials Interfaces (2015) 2:1400547.
  4. T.D.B. Jacobs, K.E. Ryan, P.L. Keating, D.S. Grierson, J.A. Lefever, K.T. Turner, J.A. Harrison, and R.W. Carpick. The effect of atomic-scale roughness on the adhesion of nanoscale asperities: a combined simulation and experimental investigation, Tribology Letters (2013) 50:81–93.
  5. J.A. Lefever, J.J. García, and J.H. Smith. A patient-specific, finite element model for noncommunicating hydrocephalus capable of large deformation, Journal of Biomechanics (2013) 46:1447–1453.