Project Management Coordinated a team of engineers (electrical, mechanical, industrial, civil) to review the nuclear waste handling surface facilities at the proposed Yucca Mountain high-level nuclear waste storage facility.
Technical lead for preparing the Structures, Systems, and Components Important to Safety section of the Yucca Mountain Safety Evaluation Report for the United States Nuclear Regulatory Commission.
Software Development Developed composite micromechanics software which placed second in NASA Software of the Year Award competition.
ABAQUS/Standard, Explicit Nonlinear finite element analysis
Senior EngineerDecember January 2013 to CurrentCity, State
Developed detailed finite element models of composite blades for Sikorsky S92 and UH60 helicopters using ANSYS Workbench, ANSYS Composite PrePost, and ANSYS APDL.
Modeling involved complex composite layup sequences and ply drops.
Investigated changing ply layups for improved blade response.
January 2005 to August 2013Company Name － City, State
Led a team of engineers to review the structures, systems and components for the nuclear waste handling surface facilities at the proposed Yucca Mountain facility.
The review evaluated risk and probability of failure of all structures, systems, and components due to credible accident scenarios.
Participated in evaluating effect of an aircraft crash into a reinforced concrete surface structure using LS-DYNA simulations and the Riera method.
Reviewed structural design documents included in license renewal applications for nuclear power plants and nuclear waste storage facilities.
The evaluation included material performance including potential for environmental degradation, structural and thermal loads.
Evaluation results where documented in Safety Analysis Reports for the Nuclear Regulatory Commission.
Performed analytical calculations to evaluate potential for radioactive release due to an explosion inside a nuclear waste reprocessing facility.
Global structural evaluations were based on the methodology given in Unified Facilities Criteria (UFC) 3-340-02.
Dynamic analysis of the building modeled a typical reinforced concrete wall as an idealized lumped mass, single-degree-of-freedom (SDOF) system.
Wall deflection and support rotation were used to access potential for damage, i.e.
spalling, scabbing, and cracking.
Conducted a study for the Nuclear Regulatory Commission on the effects of vehicle born improvised explosive devices on subsurface structures.
The study involved modeling a range of potential explosive charge sizes located on the ground surface.
Utilized ABAQUS/Explicit Eulerian and Lagrangian models to investigate the effects of ground surface and above surface explosive charges on the formation of ground surface crater formation and propagation of stress waves through the soil.
Research January 1994 to May 2005Company Name － City, State
Assisted in the development of viscoplastic constitutive models for metal alloys at high temperature.
This work involved numerical implementation of advanced non-linear time-dependent constitutive models (viscoelastic, viscoplastic) into finite element software.
Efficient local (material model) level time integration algorithms were written in FORTRAN for use in the commercial finite element code ABAQUS (UMAT) and ANSYS (USERMAT).
Developed software to automatically determine the material parameters for viscoplastic models.
This software consisted of a small specially developed nonlinear finite element code for test simulation linked to optimization routines to fit the constitutive model parameters to experimental data.
A user-friendly graphical user interface using the programming language Tcl/Tk was developed for program control and data management.
Developed an algorithm for finite element-based large-scale computations for long-term life assessment simulations.
Utilized Unix scripts to couple ABAQUS analysis, results post-processing, and optimization routines.
Evaluated the long-term rutting resistance of asphalt concrete when subjected to heavy traffic cycles.
This work involved using ABAQUS coupled with an elastoviscoplastic model to perform long-term simulations involving thousands of wheel loading cycles.
Studied deformation behavior of heart valve tissue.
Required numerical implementation of an anisotropic hyperlastic constitutive model into ABAQUS via UMAT.
Onsite Resident Research Associate January 1992 to October 1994Company Name － City, State
Developed a micromechanics based deformation and damage code, MAC/GMC, to analyze metal matrix and polymer matrix composite materials.
Code includes laminate theory and the capability to simulate complex thermomechanical load histories.
Performed investigations on fiber and matrix stress, strain and damage state using both micromechanics and finite element analysis.
Performed thermomechanical life assessments of turbine blades and combustor liners subjected to repeated simulated flight cycles.
Utilized continuum and micromechanics constitutive models in a finite element based deformation and fatigue damage algorithm.
Education and Training
Doctor of Philosophy : Civil Engineering, 1992The University of Akron － City, StateCivil Engineering
Master of Science : Civil Engineering, 1988The University of Akron － City, StateCivil Engineering
Bachelor of Science : Civil Engineering, 1984The University of Akron － City, StateCivil Engineering
data management, graphical user interface, simulation, Unix scripts
AWARDS: NASA Software of the Year Award, Runner-up, for: The Generalized Method of
Cells/Micromechanics Analysis Code, MAC/GMC.
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Doctor of Philosophy : Civil Engineering , 1992 Master of Science : Civil Engineering , 1988 Bachelor of Science : Civil Engineering , 1984
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