Group Members

 

Postdoctoral Researchers

 

Qingcheng Yang

Research interest

Computational mechanics, atomistic-to-continuum coupling, phase-field modeling, multiscale material modeling; current project: constitutive modeling of porous crystalline materials based on homogenization of crystal plasticity.

Past Education Details:
Ph.D., Mechanical Engineering, University of Pittsburgh, USA
M.S., Solid Mechanics, Beihang University, China
B.S., Engineering Mechanics, Wuhan University, China

Chandra Prakash

Research interest

Multiscale modeling of materials under extreme loading condition, Phase-Field Method.

Current Project: Multiscale modeling and design of protective hybrid composite systems for Aerospace structures.​

Past Education Details:
Ph.D., School of Aeronautics and Astronautics, Purdue University, USA, 2014-2018
M.Tech., Mechanical Engineering, Indian Institute of Technology, Kanpur, India, 2012-2014
B.Tech., Mechanical Engineering, National Institute of Technology, Raipur, India, 2007-2011

Subhendu Chakraborty

Education:
  • Ph.D., Mechanical Engineering, Johns Hopkins University, Baltimore (USA)
  • ME, Aerospace Engineering Indian Institute of Science, Bangalore, India
  • BE, Civil Engineering, Jadavpur University, Kolkata, India
Area of work
Modeling the Evolution of Defects in Crystalline Solids Using Self-consistent Coupled Atomistic-Continuum Framework.

Concurrent multiscale models that couple atomistic and continuum calculations are useful for extending the spatial limitations of atomistic models, as well as for deriving effective continuum models. This work develops a concurrent atomistic-continuum computational model with an embedded crack in the atomistic domain. Molecular dynamics (MD) simulations are conducted in the atomistic domain, while the continuum domain is modeled using the finite element (FE) method. To bridge the time scale difference, the MD model is augmented by a novel strain-boost hyperdynamics accelerated time marching scheme. The concurrent model is used to evaluate the free energy density function for phase field modeling of crack propagation in crystalline materials.

Publications
Journal Articles:
  1. S. Chakraborty, J. Zhang and S. Ghosh, “Accelerated molecular dynamics simulations for characterizing plastic deformation in crystalline materials with cracks”, Computational Materials Science, Vol. 121(2016), pp. 23-36, (Editor’s Choice).
  2. J. Zhang, S. Chakraborty and S. Ghosh, “Concurrent atomistic-continuum model for developing self-consistent elastic constitutive modeling of crystalline solids with cracks”, International Journal Multiscale Computational Engineering, Vol. 15(2017), No. 2, pp. 99-119
  3. S. Chakraborty and S. Ghosh, “Hyperdynamics accelerated concurrent atomistic-continuum model for developing crack propagation models in elastic crystalline materials”, Computational Materials Science, Vol. 154(2018), pp. 212-224, (Editor’s Choice).

Conference Articles:

  1. S Chakraborty, J Zhang and S Ghosh. “Characterization and Quantification of Crack Tip Plasticity in Crystalline Materials at Experimentally Achievable Strain Rate”, TMS2016, Tennessee, Nashville, Feb 14-18, 2016
  2. S. Chakraborty and S Ghosh. “Spatial and Temporal scale bridging of AtomisticContinuum Concurrent Multiscale Models for Inelastic modelling of materials”, WCCM2018, New York City, NY, July 22-27, 2018
Awards
  1. 3’rd place in the student poster competition at 13’th World Congress On Computational Mechanics(WCCM2018), New York, NY.

George Weber

Education:
  • B. S., Materials Science and Engineering, Drexel University, 2013
  • M. S., Materials Science and Engineering, Drexel University, 2013
  • Ph. D., Mechanical Engineering, Johns Hopkins University, 2020
Current Project Title:

Integrated Image-Based Multi-Scale Modeling of Yield, Creep, and Fatigue in Nickel-Based Superalloys

Awards:

Best Student Poster Award, at the 14th U. S. National Congress on Computational Mechanics (USNCCM14) in Montreal, Canada.

Book Chapters:
  • S. Ghosh, S. Keshavarz and G. Weber, “Computational multiscale modeling of nickel based superalloys containing gamma-gamma precipitates”, Advanced Structural Materials, Vol. 57: Inelastic Behavior of Materials and Structures under Monotonic and Cyclic Loading, H. Altenbach and M. Brunig (eds), Springer, Vol. 57, pp. 67-96, 2015.
Papers:
Conferences:
  • G. Weber, A. Bagri, M. Pinz and S. Ghosh, “An Image-Based Finite Element Model for Ni-Based Superalloys using a Two Scale Constitutive Model Accounting for Morphological Distributions of Gamma Precipitates”, 14th US National Congress on Computational Mechanics, Montreal, Canada, June 17-20, 2017.
  • G. Weber and S. Ghosh, “Multi-scale models of deformation for Ni-based Superalloys”, 3rd World Congress on Integrated Computational Materials Engineering (ICME 2015), Colorado Springs, CO, May 31 – June 4, 2015.
  • G. Weber, C. Woodward, D. Dimiduk, and  S. Ghosh, “An image based finite element model for Ni-based Superalloys using a two scale constitutive model”, TMS 2015 144th Annual Meeting & Exhibition, Orlando, FL, March 15-19, 2015
  • G. Weber, S. Keshavarz, and S. Ghosh, “Hierarchical crystal plasticity finite element model for Nickel-based Superalloys: Sub-Grain microstructures to polycrystalline aggregates”, 17th U.S. National Congress on Theoretical & Applied Mechanics, East Lansing, MI, June 18-20, 2014.

Graduate Students

Shravan Kotha

Education:
  • B.E., Civil Engineering, Osmania University, India
  • M.Tech., Structural Engineering, Indian Institute of Technology, Bombay, India.
Current Project Title:
Parametrically Homogenized Constitutive and Damage Model Development from Micro-mechanical Simulations

Parametrically Homogenized elasto-plastic Constitutive Model (PHCM) for Titanium alloys based on detailed micromechanical simulations using CPFE is developed in this work. The primary focus is to express the constitutive equations as a function of material microstructural parameters using an extensive database of CPFE simulations and Machine learning. The experimentally validated model represents material response dependency on crystallography, grain size, strain rate and temperature.  This model implemented in Abaqus/Ansys is used in efficiently solving microstructure dependent structure-material problems.

Conferences:
  • S. Kotha, D. Ozturk and S. Ghosh, “Probabilistic homogenization of crystal plasticity and fatigue crack nucleation models, EMI 2017: Engineering Mechanics Institute Conference, San Diego, CA, June 4-7, 2017.
  • S. Ghosh, S. Kotha and D. Ozturk, “Probabilistic homogenization of crystal plasticity modeling for Ti alloys”, TMS 2016 144th Annual Meeting & Exhibition, Nashville, TN, February 14-18, 2016

Xiaofan Zhang

Education:
  • PhD, Civil Engineering, Johns Hopkins University, United States.
  • MS. Civil Engineering, Northwestern University, Illinois, United States.
  • BS. Civil Engineering,  University of Macau, Macau, China.
Area of work

Developing Parametrically Homogenized Continuum Damage Mechanics (PHCDM) Model for Composite materials. This PHCDM model accounts for the microscopic morphology and evolution of composite materials during the analysis of macroscopic deformation and damage. Meanwhile, the multi-scale damage model is much more computationally efficient than the conventional FE2 methods, enabling us to understand material failure behaviors across multiple length scales with affordable computation resource.

Publications
  1. X. Zhang, D. O’Brien and S. Ghosh “Parametrically homogenized continuum damage mechanics (PHCDM) models for composites from micromechanical analysis”, Computer Methods in Applied Mechanics and Engineering, https://doi.org/10.1016/j.cma.2018.12.005
Talks
  1. X. Zhang,  D. O’Brien and S. Ghosh. “Parametric Homogenization Based Continuum Damage Mechanics Model for Composites.”  Mach Conference. Annapolis, MD. April, 2018.
  2. X. Zhang, Z. Li, D. O’Brien and S. Ghosh. “Multi-scale Damage Modeling of Composites: Parametric Homogenization Based Continuum Damage Mechanics.” American Society for Composites 31th Technical Conference. Williamsburg, Virginia. September, 2016

Max Pinz

Area of work:

Integrated Image-Based Multi-Scale Modeling of Yield, Creep, and Fatigue in Nickel-Based Superalloys

My current research is focused on the development and integration of statistical characterization of nickel-based superalloys. Recently we have developed a method of generating statistically equivalent virtual microstructures, and establishing domains for which the microstructural and property response volumes converge. My current focus is in developing a probabilistic crack nucleation model as a function of material state variables.

Education:
  • B. S., Applied Mathematics and Statistics, Johns Hopkins University, 2014
  • B. S., Chemical and Biomolecular Engineering, Johns Hopkins University, 2014
  • M. S., Chemical and Biomolecular Engineering, Johns Hopkins University, 2015
Publications
  • Pinz, M., Weber, G., Lenthe, W. C., Uchic, M. D., Pollock, T. M., & Ghosh, S. (2018). Microstructure and property based statistically equivalent RVEs for intragranular γ− γ’microstructures of Ni-based superalloys. Acta Materialia, 157, 245-258.
  • Kubair, D. V., Pinz, M., Kollins, K., Przybyla, C., & Ghosh, S. (2018). Role of exterior statistics-based boundary conditions for property-based statistically equivalent representative volume elements of polydispersed elastic composites. Journal of Composite Materials, 0021998318758498.
Talks
  • M, Pinz, G.Weber, S.Ghosh, An Integrated Microstructure Development and Crystal Plasticity Approach with Uncertainty Quantification for Multi-scale Constitutive Model Development, TMS 2017, San Diego Ca, February 2017

Jinlei Shen

Area of work:
Multi-Scale Modeling of Deformation and Crack nucleation in Ti-64 Alloy under Cyclic loading
  • Develop image-based crystal plasticity model of Ti64 for micro-mechanical analysis.
  • Calibrate and validate CPFEM microscopic crack nucleation model from experimental data
  • Parametrically Homogenized Continuum Plasticity Model(PHCM) for Ti64 is calibrated through CPFEM simulations and validated with experimental data.
  • Develop Wavelet transformation-based multi-time scale (WATMUS) for both CPFEM and PHCM to accelerate the simulation of Ti64 under cyclic loading
Education:
  • Ph.D., Civil Engineering, Johns Hopkins University, 2015-present
  • M. S., Civil Engineering, Hefei University of Technology, 2014
  • B. S., Civil Engineering ,Hefei University of Technology, 2011
Publications
  • Cheng, J., Shen, J., Mishra, R. K., & Ghosh, S. (2018). Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model. Acta Materialia149, 142-153.
  • Tu, X., Shahba, A., Shen, J., & Ghosh, S. (2018). Microstructure and property based statistically equivalent RVEs for polycrystalline-polyphase aluminum alloys. International Journal of Plasticity.

Yanrong Xiao

Education:
  • Ph.D. of Civil Engineering, Aug.2017 – present, Johns Hopkins University,
  • Master of Engineering in Civil Engineering, Sep 2014 – Jun 2017, Harbin Institute of TechnologyHarbin, P.R.China
  • Bachelor of Engineering in Civil Engineering, Aug 2010 – Jun 2014, Harbin Institute of TechnologyHarbin, P.R.China
Area of work

I am interested in multiscale damage modeling of composites material. Now I am working on the parametrically homogenized continuum damage mechanics (PHCDM) model for woven composites materials. We use the PHCDM model to predict damage behavior across various composites material length scales. The three-dimension representative volume element RVE of woven composites is used to predict the micro mechanical properties. The effective material properties of woven composites are studied using the numerical homogenization techniques to get the micro-macro equivalence embedded in PHCDM model.

 

Saikat Dan

Area of work:

I am currently working on multiphysics problems. My work essentially encompasses coupled mechanical and electromagnetic systems used in antenna and sensor applications. Specifically, I am in the process of developing material models for piezoelectric sensors to be used in the quantification of material damage in mechanical systems. I work with and develop finite element programs for solving coupled electromagnetics (Maxwell’s Equations of Electromagnetics) and mechanics (Equations of Mechanical Equilibrium) in a finite deformation paradigm. This facilitates in solving more complex mechanical systems involving sensing of mechanical damage from evolving electromagnetic fields.

Education:
  • PhD, Civil Engineering, Johns Hopkins University, United States.
  • B.Tech, Department of Civil Engineering, Indian Institute of Technology, Kharagpur (2015)
  • M.Tech, Department of Civil Engineering, Indian Institute of Technology, Kharagpur (2015)

Preetam Tarafder

Area of work:

My work is focused on computational modelling of multifunctional materials, in which the material behavior is governed by more than one governing equations and follows a coupled constitutive law. Currently, I am working on developing an efficient finite element model for piezoelectric materials in finite deformation framework by establishing a two-way coupling between mechanical and transient electric fields.

Education:
  • PhD, Civil Engineering, Johns Hopkins University, United States.
  • B.Tech., Civil Engineering, Indian Institute of Technology Kharagpur, 2017
  • M.Tech., Structural Engineering, Indian Institute of Technology Kharagpur, 2017

Maloth Thirupathi

Area of work:
My work focuses on uncertainty quantification in parametrically homogenized elasto-plastic constitutive models (PHCM) built from homogenization of microscale CPFEM simulations of poly-crystalline metals.
Education:
  • 2011-2015 B.Tech, Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai, India
  • 2015-2017 MS, Mechanical Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
  • 2017 – PhD, Civil Engineering, Johns Hopkins University

Arunjyoti Sinha Roy

Area of work: 

Modeling of Polymer Nano-composites for Molecular Dynamics simulation

Education:
  • M.Tech., Mechanical Engineering, Indian Institute of Technology, Kanpur
  • B.E., Mechanical Engineering, Indian Institute of Engineering, Science and Technology, Shibpur

Özge Özbayram

Area of work:

Multiscale modeling, coupling atomistic and continuum models

Education:
  • Ph.D., Civil Engineering, Johns Hopkins University, 2020 –
  • M.S., Civil Engineering, University of Stuttgart, Germany, 2016 – 2019
  • B.S., Civil Engineering, Istanbul Technical University, Turkey, 2009 – 2014

B.S.K. Gargeya

Area of work:

Shock Spallation in Aluminium Alloys

Research Interests:

Multiscale Modelling of Materials Deformation

Education:
  • M.Tech., Materials Engineering, Indian Institute of Science, Bangalore, India (2018-2020)
  • B.Tech., Metallurgical and Materials Engineering, National Institute of Technology Rourkela, India (2014-2018)

Ivory Jamilleth Sarceno

Area of work:

Cold Spray Modeling

Education:
  • B. S., Mechanical Engineering, George Mason University, 2020