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Department of Mathematics, NC State
William S. Oates
Postdoctoral Research Associate


address    Campus Box 8205 

email

   wsoates@ncsu.edu 
phone    (919) 515-2386 
fax    (919) 515-8967 




Graduate Research Opportunity


Research Interests

Constitutive modeling, Fracture, Ferroelectric Materials, Nonlinear Control and Device Design

Teaching Interests
Fracture, Continuum Mechanics,  Elasticity, Experimental Methodology, System Dynamics and Controls

Education
B.S.,
Mechanical Engineering, Georgia Institute of Technology, 1998
B.S.,
Mathematics, Georgia Southwestern State University, 1998
M.S.,
Mechanical Engineering, Georgia Institute of Technology, 2001
Ph.D.,
Mechanical Engineering, Georgia Institute of Technology, 2004

Position
Postdoctoral Research Associate at the Center for Research in Scientific Computation, North Carolina State University

Distinctions
Registered Professional Engineer in North Carolina

Best Student Paper award, SPIE International Smart Structures and Materials Conference, 2003.

Science Applications International Corporation (SAIC) Best Paper award, 2003.
Duke Energy Business Plan Finalist, 2001.
International Wire & Cable Symposium Scholarship Award, 1997.
Academic All-American, Georgia Southwestern State University baseball, 1994-1995.
Kaleidoscope Award, Top Ten Overall Outstanding Student, Georgia Southwestern State University, 1995.
Ryder Roundtable Scholarship Award, 1993.

Current Research
Multi-scale and multi-axial constitutive modeling of ferroic materials.
Domain length scale modeling of ferroelectric ceramics and single crystals for ferroelectric thin film, MEMS and NEMS
applications.
Computational development and experimental implementation of nonlinear control designs for smart material structures and devices.

Biosketch
William S. Oates received his B.S.
(1998) in Mechanical Engineering from Georgia Tech in Atlanta, GA after transferring from Georgia Southwestern State University in Americus, GA where he received a B.S. in Mathematics (1998) through a dual-degree program.  While pursuing his B.S. in Mechanical Engineering at Georgia Tech, he characterized fiber optic polymer coatings at Bell Laboratories in Norcross, GA.  After receiving his B.S. from Georgia Tech, he worked for Inflation Systems, Inc. developing passenger side programmable airbag inflators for BMW, Honda and Nissan.  He then returned to Georgia Tech to obtain his M.S. (2001) and Ph.D. (2004) in Mechanical Engineering.  In the fall of 2004, he joined the Center for Research in Scientific Computation at North Carolina State University where he is currently a postdoctoral research associate.

His research focuses on the development of
piezoelectric devices, constitutive modeling, and fracture of ferroelectric materials as well as nonlinear control of smart material structures. He was instrumental in designing and modeling a piezoelectric pump for morphing aircraft control surfaces while conducting research at Georgia Tech.  This work led to the Compact Hybrid Actuator Program (CHAP) supported by DARPA.  He has experimentally studied, and theoretically modeled the fracture behavior of piezoelectric ceramics and single crystals with particular emphasis in formulating mathematical theories for anisotropic, electro-mechanical coupling behavior.  His current interests include developing algorithms for real-time control of smart material systems and structures using model-based nonlinear control.

Journal Publications

Westram, I. Oates, W.S., Lupascu, D.C., Roedel, J., Lynch, C.S., "Mechanism of Electric Fatigue Crack Growth in Lead Zirconate Titanate," Acta. Mater., submitted.

Oates, W.S., Smith, R.C., "Optimal Tracking Control Using Magnetostrictive Actuators Operating in Nonlinear and Hysteretic Regimes," J. Dyn. Syst.-T. ASME, submitted.

Oates, W.S., Smith, R.C., "Nonlinear Optimal Control Techniques for Vibration Attenuation Using Magnetostrictive Actuators," J. Intell. Mater. Syst. Struct, submitted.

Oates, W.S. "Heterogeneity Influence on Electric Field Induced Piezoelectric Microfracture," J. Intell. Mater. Syst. Struct., v. 16(9), (2005), pp. 733-741.

Oates, W.S., Lynch, C.S., Lupascu, D.C., Kounga, A. "Anisotropic Fracture Behavior in Ferroelectric Relaxor PZN-4.5%PT Single Crystals," J. Am. Cer. Soc., v. 88(7), (2005), pp. 1838-1844.

Liu, T., Oates, W.S., Wan, S., Lynch, C.S. "Fracture at Partial Electrodes in PZN-0.045PT Single Crystals," J. Int. Mat. Sys. Struct., v. 16 [4], (2005), pp. 373-379.

Oates, W.S., Lynch, C.S. "New Approach to Solving Crack Tip Stress Fields in Piezoelectric Materials," J. Intell. Mater. Syst. Struct., v. 15 [7], (2004), pp. 557-563.

Oates, W.S., Lynch, C.S., Lupascu, D.C., Kounga, A., Aulbach, E., Roedel, J. "Subcritical Crack Growth in Lead Zirconate Titanate," J. Am. Cer. Soc., v. 87 [7], (2004), pp. 1362-1364.

Lynch, C.S., Oates, W.S. "Orthotropic Rescaling for Crack Tip Fields in Linear Piezoelectric Materials," Int. J. Solids Structures, v. 41 [11-12], (2004), pp. 2899-2917.

Oates, W.S., Lynch, C.S. "Piezoelectric Hydraulic Pump System Dynamic Model," J. Intell. Mater. Syst. Struct., v. 12 [11], (2001), pp. 737-744.


Conference Proceedings

Oates, W.S., Smith, R.C., "Nonlinear Open Loop Optimal Tracking Using Magnetostrictive Transducers," proceedings of the ASME IMECE (2005), Orlando, FL, to appear.

Oates, W.S., Smith, R.C., "Nonlinear Optimal Control of Plate Structures Using Magnetostrictive Materials," proc. SPIE:  Smart Materials and Structures (2005), to appear.

Oates, W.S., Webber, K.G., Lynch, C.S., Njiwa, A.K., Lupascu, D.C., "Local Fracture Properties in Ferroelectric Relaxor PZN-4.5%PT Single Crystals,"  proc. SPIE:  Smart Materials and Structures, v. 5761,
(2005), pp.299-304.

Oates, W.S., Malbec, A., Herdic S., Lynch, C.S., "Phase Field Modeling of Domain Structures in Ferroelectric Materials," proc. SPIE:  Smart materials and Structures, v. 5387, (2004), pp. 314-325.

Oates, W.S., Lynch, C.S., "New Approach to Solving Crack Tip Stress Fields in Piezoelectric Materials," proc. SPIE: Smart Materials and Structures (invited to appear in J. Mat. Sys. Struct.), v. 5053, (2003), pp. 376-386.

Oates, W.S., Lynch, C.S., "Orthotropy Rescaling for the Fracture Problem in Anisotropic Piezoelectric Materials," proc. ASME IMECE, (2002), v. 67, p. 97-102.

Oates, W.S., Mauck, L.D., Lynch, C.S., "System Dynamics Modeling of a Piezoelectric Hydraulic Pump," proc. SPIE:  Smart Materials and Structures, (2001), v. 4693, pp. 598-606.

Mauck, L.D., Oates, W.S., Lynch, C.S., "Piezoelectric Hydraulic Pump Performance," proc. SPIE:  Smart Materials and Structures, (2001), v. 4332, pp. 246-353.

Oates, W.S., Mauck, L.D., Lynch C.S., "PZT Piston Driven Hydraulic Pump Development,"  proc. 2000 12th IEEE International Symposium on Applications of Ferroelectrics.

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