Ravi Kiran Nalla

E-mail: RKNalla@lbl.gov

Education

• University of Calfornia at Berkeley, Ph.D., Materials Science & Engineering.                                            Dec ‘01 – to date
• University of Calfornia at Berkeley,Master of Science, Materials Science & Engineering.                       Aug ‘99 – Dec ‘01
• Indian Institute of Technology, Madras, India: Bachelor of  Technology, Metallurgical Engineering.      Jun ‘95 - May’99

Failure Analysis, Engineering Fracture Mechanics, Material Selection, Process/Product Design, Fatigue and Corrosion, Mechanical Testing of Materials.

Work Experience

• Working on a NIH-sponsored on initiative on life prediction in human mineralized tissue, with focus on development of fracture mechanics based framework to explain the failure of such tissues. Research Advisor: Prof. R.O. Ritchie, Materials Science & Engg., UC Berkeley. [View poster1, poster2]
• Worked on the Air Force Sponsored Research Initiative on High Cycle Fatigue, involving fatigue testing of Titanium alloys for turbine engine applications. Research Advisor: Prof. R.O. Ritchie, Materials Science & Engg., UC Berkeley.  M.S. Thesis title “Effect of Microstructure on High Cycle Fatigue Thresholds in a Turbine Engine Titanium Alloy”

Course Work at Graduate Level

Experimental Skills

• X-Ray Diffraction
• Scanning Electron Microscopy (conventional and environmental)
• Transmission Electron Microscopy
• Semiconductor IC Microfabrication
• Device Characterization
• Mechanical Testing on High Frequency Materials Test Systems

Publications

• R.K. Nalla, B.L. Boyce, J.P. Campbell, J.O. Peters and R.O. Ritchie, “Influence of Microstructure on High-Cycle Fatigue of Ti-6Al-4V: Bimodal vs. Lamellar Structures”, Metall. Mater. Trans.A, vol.33A (no.3A), March 2002. pp.899-918.
• R.K. Nalla, J.P. Campbell and R.O. Ritchie, “Effects of Microstructure on Mixed-Mode, High-Cycle Fatigue Crack Growth Thresholds in Ti-6Al-4V”, Fatigue Fract. of Engng. Mater. Struct., vol.25 (no.6), June 2002. pp.587-606
• R.K. Nalla, J.P. Campbell and R.O. Ritchie, “Mixed-Mode, High-Cycle Fatigue-Crack Growth Thresholds in Ti-6Al-4V: Role of Small Cracks”, Int. J Fatigue, vol.24, 2002. pp. 1047-1062.
• R.K. Nalla, I. Altenberger, U. Noster, G.Y. Liu, B. Scholtes, and R.O. Ritchie, “On the Influence of Mechanical Surface Treatments - Deep Rolling and Laser Shock Peening - on the Fatigue Behavior of Ti-6Al-4V at Ambient and Elevated Temperatures”, Mater. Sci. Eng. A, 2003. in press.
• I.Altenberger, R.K. Nalla, U. Noster, G. Liu, B. Scholtes and R.O. Ritchie, "Verhalten laserschockverfestigter und festgewalzter Randschichten der Ti-Legierung Ti-6Al-4V bei schwingender Beanspruchung unter erhöhten Temperaturen", Materialwissenschaft und Werkstofftechnik, vol. 34, 2003. pp. 529-541.
• R.K. Nalla, J.H. Kinney, and R.O. Ritchie, "Mechanistic Fracture Criteria for the Failure of Human Cortical Bone", Nature Mater., vol.2, 2003. pp. 164-168.
• R.K. Nalla, J. S. Stölken, J. H. Kinney and R. O. Ritchie, "On the Micro-Mechanisms of In Vitro Fracture and Toughening in Human Cortical Bone", J. Biomech., 2003. in review.
• I.Altenberger, E. A. Stach. G. Liu, R.K. Nalla and R.O. Ritchie, "An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening", Scripta Materialia, vol 48, 2003. pp. 1593-1598.
• R.K. Nalla, J.H. Kinney,  S.J. Marshall and R.O. Ritchie, "On the In Vitro Fatigue Behavior of Human Dentin: Effect of Mean Stress", J. Dent.Res., 2003, in review.
• V. Imbeni, R.K. Nalla, C. Bosi, J.H. Kinney, and R.O. Ritchie, “On the in vitro fracture toughness of human dentin”, J. Biomed. Mater. Res., 2003; 66A:1-9.
• R.K. Nalla, V. Imbeni, J.H. Kinney, M. Staninec, S.J. Marshall and R.O. Ritchie, “On the in vitro fatigue behavior of human dentin with implications for life prediction”, J. Biomed. Mater. Res., 2003; 66A:10-20.
• R.K. Nalla, J.H. Kinney, and R.O. Ritchie, “On the fracture of human dentin- Is it stress- or strain-controlled?”, J. Biomed. Mater. Res., 2003. in press.
• R.K. Nalla, J.H. Kinney, and R.O. Ritchie, “Effect of orientation on the in vitro fracture toughness of dentin: The role of toughening mechanisms”, Biomater., 2003; 24:3955:3968.
• R.K. Nalla, J.H. Kinney, and R.O. Ritchie, “Mechanistic Fracture Criteria for the Failure of Human Cortical Bone”, Nature Mater., 2003; 2:164-168.
• J.J. Kruzic, R.K. Nalla, J.H. Kinney and R.O. Ritchie, “Crack blunting, crack bridging and resistance-curve fracture mechanics in dentin: Effect of hydration”, Biomater., 2003. in press.

• R.K. Nalla, J.P. Campbell and R.O. Ritchie, “Short and Large Crack, Mixed-Mode Fatigue-Crack Growth Thresholds in Ti-6Al-4V”, in: Proc. 6th Conf. on High Cycle Fatigue, Jacksonville, FL, March 2001.
• R.K. Nalla, J.P. Campbell and R.O. Ritchie, “Mixed-Mode, High-Cycle Fatigue-Crack Growth Thresholds in Ti-6Al-4V: A Comparison of Large and Small Crack Behavior”, in: Proc. 6th Int. Conf. on Biaxial/Multiaxial Fatigue & Fracture, Lisbon, Portugal, 2001.
• R.K. Nalla, J.P. Campbell and R.O. Ritchie, “Mixed-mode thresholds in high cycle fatigue in Ti-6Al-4V”, in: Proc. “David L. Davidson Symposium on Fatigue”, Eds. K.S. Chan, P.K. Liaw, R.S. Bellows, T. Zogas, and W.O. Soboyejo, TMS, Warrendale, PA, 2002.
• V. Imbeni, R.K. Nalla, J.H. Kinney, M. Staninec, S.J. Marshall, G.W. Marshall and R.O. Ritchie, “Stress/Life Cyclic Fatigue Behavior of Human Dentin”, in: Proc. IADR/AADR/CADR meeting (J. Dent. Res.), San Diego, CA, March 2002. [View poster]
• I. Altenberger, R.K. Nalla, U. Noster, B. Scholtes, and R.O. Ritchie, “On the Fatigue Behavior and Associated Effect of Residual Stresses in Deep-Rolled and Laser Shock Peened Ti-6Al-4V Alloys at Ambient and Elevated Temperatures”, HCF 2002: 7th National Turbine Engine High Cycle Fatigue Conference, Palm Beach, FL, May 2002. [View presentation]
• R.K. Nalla and R.O. Ritchie, “Role of Crack Size and Microstructure on Mixed-Mode High-Cycle Fatigue Thresholds in Ti-6Al-4V”, HCF 2002: 7th National Turbine Engine High Cycle Fatigue Conference, Palm Beach, FL, May 2002. [View presentation]
• J.O. Peters, G. Lütjering, R.K. Nalla, I. Altenberger, and R.O. Ritchie, “High cycle fatigue of beta-titanium alloys”, in: Proc. Fatigue 2002, Stockholm, Sweden, 2002.
• R.K. Nalla, V. Imbeni, J.H. Kinney, S.J. Marshall and R.O. Ritchie, “On the development of life prediction methodologies for the failure of human teeth”, submitted to: Proc. Symposium on Materials Lifetime Science and Engineering, Eds.: P.K. Liaw et al.), TMS, San Diego, CA, March 2003. [View paper] [View presentation]
• R.K. Nalla, V. Imbeni, J.H. Kinney, M. Staninec, S.J. Marshall, G.W. Marshall and R.O. Ritchie, “On the Development of a Fracture Mechanics-Based Approach to Failure Prediction in Human Dentin”, in: Proc. IADR/AADR/CADR meeting, San Antonio, TX, March 2003. [View poster]
• I. Altenberger, U. Noster, R.K. Nalla, B. Scholtes and R.O. Ritchie, "Residual Stress Relaxation in Fatigue of Mechanically Surface Treated Materials", in: Measurement and Interpretation of Internal/Residual Stresses: Processing, Orgs.: C. S. Hartley, M. A. M. Bourke and B. K. Kad, TMS, San Diego, CA, March 2003.
• I. Altenberger,  R.K. Nalla, U. Noster, B. Scholtes and R.O. Ritchie, "On the Effects of Residual Stresses on Fatigue Behavior in Deep-Rolled and Laser Shock Peened Ti-6Al-4V at Ambient and Elevated Temperatures", in: Measurement and Interpretation of Internal/Residual Stresses: Neutron and SXRD, Orgs.: C. S. Hartley, M. A. M. Bourke and B. K. Kad, TMS, San Diego, CA, March 2003. [View presentation]
• R. O. Ritchie, C. L. Muhlstein, and R. K. Nalla, "On the Fatigue and Fracture of 'Nano' and 'Bio' Materials", in: Proceedings of the International Conference on Advanced Technology in Experimental Mechanics 2003 (ATEM'03), H. Kimura, ed., 2003.