Amir Keyhani, Ph.D.

Senior Associate
Mechanical Engineering
Menlo Park
  • CV (English)
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Dr. Keyhani is a mechanical engineer specializing in solid mechanics, finite element analysis (FEA), fracture mechanics, micro-mechanics, shock physics, and mechanical design. He has applied his expertise to predict and/or improve the performance of a wide range of materials and structures including thin metallic films, additively manufactured materials, energetic materials, polymer composites, heat exchangers, and consumer electronics. He is proficient in programing with Fortran, Python, C/C++, and MATLAB. During his academic and industrial career in mechanical engineering, he has overcome several long-standing challenges in the field and published over 10 technical papers in pioneer journals.

Dr. Keyhani has developed novel computational and experimental techniques to analyze and predict the behavior materials and structures with unprecedented levels of detail. He has applied proven methods and developed novel techniques to predict failure processes in a wide range of materials including metals, polymers, composites, and additively manufactured materials. The techniques developed link the material behavior at macro and micro scales to accurately account for underlaying physics of material failure. He is also experienced in analyzing damage and failure in materials and structures subjected to dynamic and impact loading events.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Mechanical Engineering, Georgia Institute of Technology (Georgia Tech), 2020

Publications

Peer-Reviewed Journal Articles

Keyhani A, Zhou M. Effect of Structure on Response of a 3D-Printed Photopolymer-Particulate Composite Under Intermediate Strain Rate Loading. Journal of Applied Mechanics 2020; 87(11).

Keyhani A, Zhou M. Thermo-Mechanical Response of an Additively Manufactured Energetic Material Simulant to Dynamic Loading. Journal of Dynamic Behavior of Materials 2020.

Wagner KB, Keyhani A, Boddorff AK, Kennedy G, Montaigne D, Jensen BJ, Beason M, Zhou M, Thadhani NN. High-speed x-ray phase contrast imaging and digital image correlation analysis of microscale shock response of an additively manufactured energetic material simulant. Journal of Applied Physics 2020;127(23):235902.

Wei Y, Olsen DH, Miller CM, Wagner KB, Keyhani A, Thadhani N, Zhou M. Computational Design of Three-Dimensional Multi-Constituent Material Microstructure Sets with Prescribed Statistical Constituent and Geometric Attributes. Multiscale Science and Engineering 2020; 2:7-19.

Keyhani A, Yang R, Zhou M. Novel capability for microscale in-situ imaging of temperature and deformation fields under dynamic loading. Experimental Mechanics 2019; 59(5):775-90.

Keyhani A, Kim S, Horie Y, Zhou M. Energy dissipation in polymer-bonded explosives with various levels of constituent plasticity and internal friction. Computational Materials Science 2019; 159:136-49.

Keyhani A. Overdriven dislocation-precipitate interactions at elevated temperatures. Computational Materials Science 2018; 146:54-60.

Keyhani A, Roumina R. Dislocation-precipitate interaction map. Computational Materials Science 2018; 141:153-61.

Karami M, Yaghoubi M, Keyhani A. Experimental study of natural convection from an array of square fins. Experimental Thermal and Fluid Science 2018; 93:409-18.

Torabi M, Keyhani A, Peterson GP. A comprehensive investigation of natural convection inside a partially differentially heated cavity with a thin fin using two-set lattice Boltzmann distribution functions. International Journal of Heat and Mass Transfer 2017; 115:264-77.

Keyhani A, Roumina R, Mohammadi S. An efficient computational technique for modeling dislocation–precipitate interactions within dislocation dynamics. Computational Materials Science 2016; 122:281-7.

Keyhani A, Goudarzi M, Mohammadi S, Roumina R. XFEM–dislocation dynamics multi-scale modeling of plasticity and fracture. Computational Materials Science 2015; 104:98-107.

Prior Experience

Dr. Keyhani completed his Ph.D. in mechanical engineering at the Georgia Institute of Technology. In a joint project between Georgia Tech and US Air Force, he took a key part in developing a novel device for time-resolved and space-resolved measurements of the temperature and deformation fields at the microstructure level under dynamic conditions. The device was used to provide detailed first-time ever insight into the processes of fracture, friction, shear localization, and temperature spike development in material microstructures. He also developed and applied a meso scale computational model to analyze the effects of microstructure attributes including structure, anisotropy and defects on the thermo-mechanical response of an additively manufactured material. He established trends in and quantification of the relations between structure and response of a class of additively manufactured photopolymer-particulate composites. The trends were used to support the design of next-generation additively manufactured energetic materials.

Prior to his Ph.D. term, Dr. Keyhani worked on several projects including optimization of heat exchangers and prediction of damage and failure in metals and alloys. In the latter project, he developed and applied a novel multi-scale framework to predict damage and failure in metallic thin films and micro wires. Referred as XFEM-DD, the framework cohesively integrated the extended finite element framework (XFEM) and the dislocation dynamics methodology (DD). While former frameworks were limited to the analysis of only mode-I crack propagation to avoid the expensive remeshing procedure, XFEM-DD proved its efficiency and robustness in mixed-mode crack propagation analysis in metals and alloys. This framework was used to analyze deformation and fracture in several micro-devices.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Mechanical Engineering, Georgia Institute of Technology (Georgia Tech), 2020