Education
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Ph.D. from University of Missouri, Columbia, Mechanical & Aerospace Engineering, 2014
Dissertation advisor: C.W. LaPierre Professor P. Frank Pai
Dissertation title: "Innovative Design of Metamaterial Structures for Elastic Wave Absorption and Structural Vibration Suppression"
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M.S. from University of Missouri, Columbia, Mechanical & Aerospace Engineering, 2012
Thesis advisor: C.W. LaPierre Professor P. Frank Pai & Hongbin Bill Ma
Thesis title: "Nonlinear Thermomechanical Finite-element Modeling, Analysis and Characterization of Multi-turn Oscillating Heat Pipes"
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B.S. from Huazhong University of Science & Technology, Mechanical Engineering, China, 2011
Work Experience
2019-present Senior Software Engineer at Siemens
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Siemens' acquisition of Atlas3D: Siemens acquired Atlas3D in 2019 and Atlas3D is now operating independently as part of the Siemens Additive Manufacturing (AM or 3D printing) solution portfolios.
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Software Development for NX: Major roles include integrating Atlas3D algorithms into NX environment, development of generic and robust algorithms for generating support structures for polymer 3D printing processes, rendering support structures in NX viewer, z-compensation for 3D objects in binder jet AM processes, and intersection detection and removal for meshes with defects.
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Path Optimization with Machine Learning: The laser scanning path in AM build processes were optimized by machine learning algorithms developed based on scikit-learn library. The model is trained against thermal data from FEM simulation. Optimized print files were generated for an SLM machine and experiment results show that uniform thermal profile can be achieved with the optimized path.
2017-2019 Vice president of product development at Atlas3D
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Cofounder of Atlas3D: Atlas3D is a SaaS platform for AM applications built upon my research work at Notre Dame and AWS services. Main features of the platform include fast thermo-mechanical simulation of AM build processes with parallel computing, optimization of build orientation and support design, nesting of 3D objects with collision detection algorithms, and digital mesh processing functions like remeshing, decimation, hole filling, mesh repair, voxelization and high-quality 2D/3D mesh generation based on constrained Delaunay triangulation.
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Parallel Computing for Atlas3D: Open MPI was employed on the CPU side to allow for the evaluation of thermal distortion of multiple build orientations at the same time while Kokkos by Sandia National Lab was employed on the GPU side to accelerate the FEM simulation of each build orientation. The overall improvement of the computational efficiency is over 100 times.
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Front-end Development: Took part in the front-end development for Atlas3D under the Vue.js framework. Major roles include developing 3D web viewers where users can input AM build parameters, manipulate part orientations, paint on part surfaces, generate and render support structures, submit optimization jobs and view thermal distortion on parts. The viewer was built from scratch based on the Three.js WebGL library.
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Design, Simulation and 3D Printing of Gyroid Heat Exchangers: Heat exchangers based on gyroid surfaces were designed with SolidWorks and Rhinoceros 3D. The design was imported into COMSOL and a thermo-fluid multi-physics model was developed to analyze the flow pattern and heat transfer performance. The optimized design was printed with an EOS M290. Experiment shows that the heat transfer efficiency of the novel heat exchanger design is significantly higher than a commercial benchmark product.
2015-present: Postdoctoral associate at University of Notre Dame
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Parametric Design of Functional Support Structures for Metal Alloy Feedstocks: This project optimized part orientation and support structures in Direct Metal Laser Sintering (DMLS) AM build process. The Thermal Circuit Network (TCN) model was developed for fast prediction of temperature history, and the quasi-static thermo-mechanical (QTM) model was developed for fast prediction of on/off-substrate elasto-plastic distortion and residual stress due to thermal loading. The TCN and QTM were integrated with the DIRECT optimization algorithm to find the optimal part orientation and support structures for minimum part distortion. The optimization results were validated by coordinate measuring machine of parts printed by EOS M290 machines.
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Multi-physics Modeling of Metallic AM Processes: Investigated the multi-physical processes in metallic additive manufacturing, including laser/electron beam absorption, heat conduction into the metal powder bed, convection and radiative heat transfer into the inert gas phase, phase change of metal powders, Marangoni convection in the melt pool, balling effect due to Plateau-Rayleigh instability and the dynamic motion of metal powders.
Postdoctoral Associate at University of California, Merced
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Non-diffusive Heat Conduction: Developed ballistic-diffusive heat conduction models to predict the non-Fourier thermal behavior at nanoscale.
2011-2014 Research Assistant at Structural Mechanics and Controls Lab
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Design and Simulation of Acoustic Metamaterials: Designed acoustic metamaterial beam and plate structures for elastic wave absorption and vibration suppression with SolidWorks. The working mechanism of acoustic metamaterials was revealed to be based on traditional vibration absorbers. The performance of the metamaterial structures was thoroughly studied through in-house Matlab FEM code and benchmarked against Abaqus. Both explicit and implicit analyses were performed to study the behavior of metamaterial beams and plates under periodic and transient loadings.
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Multi-physics Simulation of Oscillating Heat Pipes (OHPs) : Developed a multi-physics model for OHPs with Matlab by coupling phase change in the vapor phase, convective heat transfer in the liquid phase, and mechanical motion of the liquid slugs. The fundamental working mechanism of OHPs was revealed by modal analysis of the liquid-vapor slug system and the velocity signal of the liquid slugs.
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CFD Modeling of Airfoils: Established a fluid dynamics model and developed in-house Matlab code for simulating the air flow around two adjacent airfoils; applied an upwind scheme to compute the momentum and energy field in the computational domain.
Teaching Experience
2011-2014: Teaching Assistant at University of Missouri, Columbia
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Taught in a lab class "Computational Methods for Engineering Design"; prepared class contents for each lecture; helped students with homework assignments.
Computer Skills
Matlab, Fortran, C++, ABAQUS, ANSYS, COMSOL, Autocad, Solidworks, CNC programming, U/G, Inventor, Pro/E, Labview, Freehand, Dreamweaver, Word, Excel, PowerPoint
Honors and Affiliations
2012-2014 Vice President of the Badminton Club at University of Missouri, Columbia
2012-2013 Missouri Honors Award
2009 Chinese National Scholarship
2008 Outstanding Academic Scholarship
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Senior Software Engineer
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Siemens PLM MFE Additive
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hao.peng@siemens.com