Youssef Hammi

• 2019 - Present, Associate Professor, Mechanical Engineering Department, Mississippi State University
• 2004 - Aug. 2019, Assistant/Associate Research Professor, Center for Advanced Vehicular Systems, Mississippi State University
• 2000 - Oct. 2003, Postdoctoral Research Fellow, Sandia National Laboratories, Livermore, CA
• 1996 - Apr. 2000, Graduate Research Assistant, University of Technology of Troyes, Troyes, France
• 1995 - Mar. 1996, Research Engineer, Laboratoire de Modélisation en Mécanique, University Pierre and Marie Curie (Paris, VI), Paris, France

• Material Development
• Nonlinear Finite Element Analysis
• Computational and Structural Mechanics
• Continuum and Fracture Mechanics
• Damage Mechanics
• Finite Element Analysis of Metal Forming Processes
• Coupled Eulerian Lagrangian (CEL)
• eXtended Finite Element (XFEM)
• Fluid Structure Interaction

• StatePride Research Award 2011, Mississippi State University
• Region Champagne-Ardennes Fellowship Research Award, France, 2000
• Awarded Very Honorable PhD Thesis Dissertation, Troyes, France, 2000

Journals

• Jeremiah Stache, John F Peters; Jeremiah Stache; Youssef Hammi, and Farshid Vahedifard, (2019), A Kinematic Hardening Model based on Endochronic Theory for Complex Stress Histories Corresponding Author:Farshid Vahedifard, Computers and Geotechnics, Elsevier (under revision).
• Cisko, A.R.; Jordon, J.B.; Avery, D.Z.; Liu, T.; Brewer, L.N.; Allison, P.G.; Carino, R.L.; Hammi, Y.; Rushing, T.W.; Garcia, L. (2019) Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy. Metals, Vol. 9, 293.
• E. Cho, Y. Hammi, A.L. Bowman, Shun-Ichiro Karato, J.R. Baumgardner, M.F. Horstemeyer, (2019), A unified static and dynamic recrystallization Internal State Variable (ISV) constitutive model coupled with grain size evolution for metals and mineral aggregates, International Journal of Plasticity, Vol. 112, Pages 123-157, ISSN 0749-6419, https://doi.org/10.1016/j.ijplas.2018.08.009.
• Youssef Hammi, Tonya Stone, Haley Doude, L. Arias Tucker, P. G. Allison, and Mark F. Horstemeyer, (2018), Chapter 6: Steel Powder Metal Modeling, Integrated Computational Materials Engineering (ICME) for Metals: Concepts and Case Studies, Editor: Mark F. Horstemeyer, 2018 John Wiley & Sons, Inc., pp. 137-198.
• Heechen E. Cho, Youssef Hammi, David K. Francis, Tonya Stone, Yuxiong Mao, Ken Sullivan, John Wilbanks, Robert Zelinka, and Mark F. Horstemeyer, (2018), Microstructure‐Sensitive, History‐Dependent Internal State Variable Plasticity‐Damage Model for a Sequential Tubing Process, Integrated Computational Materials Engineering (ICME) for Metals: Concepts and Case Studies, Editor: Mark F. Horstemeyer, John Wiley & Sons, Inc., pp. 199-234.
• Haley Doude, David Oglesby, Philipp M. Gullett, Haitham El Kadiri, Bohumir Jelinek, Michael I. Baskes, Andrew Oppedal, Youssef Hammi, and Mark F. Horstemeyer, (2018), Chapter 10: Cast Magnesium Alloy Corvette Engine Cradle, Integrated Computational Materials Engineering (ICME) for Metals: Concepts and Case Studies, Editor: Mark F. Horstemeyer, John Wiley & Sons, Inc., pp. 337-376.
• Marco Lugo, Wilburn Whittington, Youssef Hammi, Clémence Bouvard, Bin Li, David K. Francis, Paul T. Wang, and Mark F. Horstemeyer, (2018), Chapter 11: Using an Internal State Variable (ISV)–Multistage Fatigue (MSF) Sequential Analysis for the Design of a Cast AZ91 Magnesium Alloy Front‐End Automotive Component, Integrated Computational Materials Engineering (ICME) for Metals: Concepts and Case Studies, Editor: Mark F. Horstemeyer, John Wiley & Sons, Inc., pp. 377-409.
• Tonya Stone and Youssef Hammi, (2018), Chapter 13: Nickel Powder Metal Modeling Illustrating Atomistic‐Continuum Friction Laws, Integrated Computational Materials Engineering (ICME) for Metals: Concepts and Case Studies, Editor: Mark F. Horstemeyer, John Wiley & Sons, Inc., pp. 447-464.
• Paliwal, B., Hammi, Y., Moser, R.D., & Horstemeyer, M.(Mar 2017). A Three-invariant Cap-plasticity Damage Model for Cementitious Materials. International Journal of Solids and Structures Elsevier, 108, 186-202.
• Liu, Y., Whittington, W. R., & Hammi, Y.(Jan 2017). Application of a Microstructure-based ISV Plasticity Damage Model to Study Penetration Mechanics of Metals and Validation through Penetration Study of Aluminum. Modelling and Simulation in Engineering, 6189168, 1-10.
• Huddleston, B. D., Dickel, D. E., Horstemeyer, M., Williams, N., Danielson, K., and Hammi, Y.(Dec 2016). Damage Progression and Fragmentation in Atomistic, Single Crystal Copper at High Strain Rates. Solid State Phenomena Trans Tech Publications, 258, 49-52.
• Dou Y., Liu Y., Hammi Y., Whittington W., Application of a Microstructure-Based ISV Plasticity Damage Model to Study Penetration Mechanics of Metals and Validation through Penetration Study of Aluminum. Modelling & Simulation in Engineering. 1-10, Jan. 29, 2017.
• Lawrimore, W.B. II, Francis, D.K. Bouvard, J-L., Hammi, Y., & Horstemeyer, M.F., (2016), “A Mesomechanics Parametric Finite Element Study of Damage Growth and Coalescence in Polymers Using an Internal State Variable Model”, Mechanics of Materials, 96, pp. 83–95.
• Yadollahi, A., Shamsaei, N., Hammi, Y., & Horstemeyer, M.F., (2016), “Quantification of tensile damage evolution in additive manufactured austenitic stainless steels”, Materials Science and Engineering: A, 657, No. 7, pp. 399–405.
• Francis, D.K., Bouvard, J.-L., Hammi, Y., & Horstemeyer, M.(Aug 2014). Formulation of a Damage Internal State Variable Model for Amorphous Glassy Polymers. International Journal of Solids and Structures, 51(15-16), 2765–2776.
• Whittington, W. R., Oppedal, A. L., Turnage, S., Hammi, Y., Rhee, H., Allison, P., Crane, C.K., & Horstemeyer, M.(Jan 2014). Capturing the Effect of Temperature, Strain Rate, and Stress State on the Plasticity and Fracture of Rolled Homogeneous Armor (RHA) Steel. Materials Science and Engineering: A Elsevier, 594, 82-88.
• Allison, P., Grewal, H., Hammi, Y., Brown H.R., Whittington, W.R., & Horstemeyer, M.(2013). “Plasticity and Fracture Modeling/Experimental Study of a Porous Metal Under Various Strain Rates, Temperatures, and Stress States,” J. Eng. Mater. Technol., 135(4).
• G. Allison, Y. Hammi, J. B. Jordon & M. F. Horstemeyer (2013) Modelling and experimental study of fatigue of powder metal steel (FC-0205), Powder Metallurgy, 56:5, 388-396
• Tang, T., Hammi, Y., Horstemeyer, M., & Wang, P.(Apr. 2012). Finite Element Micromechanical Analysis of the Deformation and Stress State Dependent Damage Evolution in Fiber Reinforced Metal Matrix Composites. Computational Materials Science, Vol. 59, pp. 165–173.
• Horstemeyer, M., Hammi, Y., Allison, P.G., Brown, H.R., Tucker, M.T., & Hwang, Y. (Sep 2011), “Microstructure-Property Relations of a Steel Powder Metal under Varying Temperatures, Strain Rates, and Stress States,” Matls. Science Eng. A, 529(1), 335-344.
• Damiens, N. R., Rhee, H., Hwang, Y., Park, S.J., Hammi, Y., Lim, H., & Horstemeyer, M., “Investigation on the Compressive Behavior of Turtle's Shell: Experiment,” Modeling, and Simulation. Journal of the Mechanical Behavior of Biomedical Materials, Volume 6, February 2012, Pages 106-112.
• Ma, Q., Marin, E.B., Antonyraj, A., Hammi, Y., Kadiri, H. E., Wang, P.T. and Horstemeyer, M.F. (2011) On Predicting the Channel Die Compression Behavior of HCP Magnesium AM30 using Crystal Plasticity FEM, in Magnesium Technology 2011 (eds W. H. Sillekens, S. R. Agnew, N. R. Neelameggham and S. N. Mathaudhu), John Wiley & Sons, Inc., Hoboken, NJ, USA.
• Acar, Y. Hammi., P.G. Allison, T.W. Stone, & M.F. Horstemeyer, 2010, "Sensitivity and Uncertainty Analysis of Microstructure-Property Relations for Compacted Powder Metals," Powder Metallurgy, 53(2), 141-145.
• Xue, A. Wright, D.L. McDowell, M.F. Horstemeyer, K.N. Solanki,and Y. Hammi, 2010, "Micromechanics Study of Fatigue Damage Incubation Following an Initial Overstrain," Journal of Engineering Materials and Technoloogy, 132(1), 021010-17.
• N. Solanki, M.F. Horstemeyer,G. Steele, Y. Hammi, and B. Jordon, 2010, "Calibration, Validation, and Verification Including Uncertainty of a Physically Motivated Internal State Variable Plasticity and Damage Model, " International J. of Solids and Structures, 47(2), 186-203.
• El Kadiri, L. Wang, H.O. Gulsoy, P. Suri, S.J. Park, Y. Hammi, and R.M. German, 2009, "Development of a Ti-based alloy: Design and experiment," JOM Journal of the Minerals, Metals and Materials Society Springer Boston, 61(5), 60-66.
• W. Stone,M.F. Horstemeyer, Y. Hammi, and P.G. Gullett, 2008, "Contact and Friction of Single Crystal Nickel Nanoparticles Using Molecular Dynamics," Acta Materialia, 56, 3577-3584.
• W. Stone, M.F. Horstemeyer, Y. Hammi and P.G. Gullett, 2008, "Contact and Friction of Single Crystal Nickel Nanoparticles Using Molecular Dynamics,” Acta Materialia (accepted).
• Li, S.J. Park, Y. Hammi, R.M. German and P.J. Blue, 2008, "Prediction of Tool Wear and Tool Life by Experiment, Modeling, and Simulation of the Die Compaction Process,” Advances in Powder Metallurgy and Particulate Materials, Princeton, NJ: Metal Powder Industries Federation.
• Hammi and M.F. Horstemeyer, 2007, “A Physically Motivated Anisotropic Tensorial Representation of Damage with Separate Functions for Void Nucleation, Growth, and Coalescence”, International Journal of Plasticity, Vol. 23, no. 10-11, pp. 1641–1678.
• Hammi, T.W. Stone, and M.F. Horstemeyer, 2005, "Constitutive Modeling of Metal Powder Behavior", SAE 2005 Transactions, J. of Materials & Manufacturing, Vol. 114, n. 5, pp. 293–299.
• Hammi, M.F. Horstermeyer and D.J. Bammann. 2003. ‘‘Modeling of Anisotropic Damage for Ductile Materials in Metal Forming Processes”, International Journal of Damage Mechanics, vol. 13, no. 2, pp. 123–146.
• Hammi, M.F. Horstermeyer and D.J. Bammann. 2003. ‘‘An Anisotropic Damage Model for Ductile Metals”, International Journal of Damage Mechanics, vol. 12, no. 3, pp. 245–262.
• Cherouat, K. Saanouni and Y. Hammi. 2003. “Improvement of forging process of a 3D complex part with respect to damage occurrence”, J. Mater. Process. Tech., vol. 142, no. 2, pp. 307–317.
• Saanouni, A. Cherouat and Y. Hammi. 2002. ‘‘Numerical improvement of thin tubes hydroforming with respect to ductile damage”, International Journal of Mechanical Sciences, Volume: 44, Issue: 12, pp. 2427–2446.
• Saanouni, A. Cherouat and Y. Hammi. 2000. ‘‘Stress Computation in Finite Elastoplasticity with Isotropic Ductile Damage for Metal Forming”, Revue Européenne des Eléments Finis, vol. 10, n°2-3-4, p. 327–351.
• Saanouni and Y. Hammi. 2000. ‘‘Numerical Simulation of Damage in Metal Forming Processes”, in Continuous Damage and Fracture, Edited by A. Benallal, Elsevier, pp. 353–363.
• Saanouni, K. Nesnas and Y. Hammi. 2000. "Damage Modeling in Metal Forming Processes," International Journal of Damage Mechanics, vol. 9, no. 3, pp. 196–240.

Conference Papers

• Paliwal, B., Jordan, M. E., Scott, D., Hammi, Y., Moser, R., & Horstemeyer, M.(). Internal State Variable (ISV) Informed Cap-Plasticity Damage Model with Highly Non-linear Hardening for Cementitious Materials, 2017 International Mechanical Engineering Congress and Exposition (ASME), Tampa, FL, Nov 3-9, 2017.
• Paliwal, B., Hammi, Y., & Horstemeyer, M.Three Invariant Capped Damage-plasticity Constitutive Model for Cementitious Materials, XXIV ICTAM Conference, Montreal, Canada, Aug 21-26, 2016.
• Abedin, M.Z., Chang, C.C., Li, B., Hammi, Y., and Horstemeyer, M.(2011). Powder Metal Main Bearing Cap Durability and Fatigue Analysis Using Density Distribution Based Mechanical Properties. SIMULIA Customer Conference, Barcelona, Spain.
• Najafi, A., Rais-Rohani, M., and Hammi, Y.(Jul 2011). Multi-Attribute Integrated Forming-Crush Simulation Optimization Using Internal State Variable Model. Proceedings, !st World Congress on Integrated Computational Materials Engineering.
• Stone, T.W., Asafa, O. A., Stone, J., & Hammi, Y.(Oct 2011). Multiscale Modeling of Nanoparticle Deformation. Material, Science and Technology (MS&T) Conference, Columbus, OH (2011)
• Ma, Q., Marin, E., Antonyraj, A., Hammi, Y., Wang, P., & Horstemeyer, M.(Oct 2010). On Predicting the Channel Die Compression Behavior of HCP Magnesium AM30 Using Crystal Plasticity FEM. Magnesium Technology 2011, 583-587. Proceedings of 2011 TMS Annual Meeting and Exhibition, San Diego, California, USA.
• Hammi, Y., T.W. Stone, P.G. Allison, and M.F. Horstemeyer, 2010, “Fatigue Modeling of a Powder Metallurgy Main Bearing Cap,“ 2010 SIMULIA Customer Conference, Providence, RI: 3DS SIMULIA.
• Florea, R. S., Solanki, K.N., Hammi, Y., Bammann, D., & Castanier, M.P. (Aug 2010). An Experimental Study of Mechanical Behavior of Resistance Spot Welded Aluminum 6061-T6 Joints. Proceedings of the ASME International Mechanical Engineering Congress & Exposition, IMECE2010, Vancouver, British Columbia, Canada.
• W. Stone,, Y. Hammi, R.L. Carino, and M.F. Horstemeyer,2009, Modeling for Powder Metallurgy Component Design and Performance Prediction. Advances in Powder Metallurgy & Particulate Materials, Las Vegas, NV: MPIF.
• W. Stone,, H.I. Sanderow, H.I. Grewal, H., E. Acar, Y. Hammi, P.G. Allison, and K.N. Solanki, K.N., 2009, Process Modeling: Use of Uncertainty, Sensitivity and Optimization Techniques for Improved Understanding of Compaction Model Outputs. Advances in Powder Metallurgy & Particulate Materials, Las Vegas, NV: MPIF.
• Hammi, T.W. Stone, L. Tucker, P.G. Allison, and M.F. Horstemeyer, “Modeling for Powder Metallurgy Component Design and Performance Prediction,” MPIF/APMI 2008 World Congress on Powder Metallurgy & Particulate Materia, Washington, DC, June 8-12 2008, 1-96 –1-110.
• W. Stone, L. Tucker, Y. Hammi, T.N. Williams, H. El Kadiri, and M.F. Horstemeyer, “Comparison of Density Measurement Techniques for Large PM Components,” MPIF/APMI 2008 World Congress on Powder Metallurgy & Particulate Materialsl, Washington, DC, June 8–12 2008.
• G. Allison, H. Brown, Y. Hammi, and M.F. Horstemeyer, “Stress-State Dependence of FC-0205 Steel Powder,” MPIF/APMI 2008 World Congress on Powder Metallurgy & Particulate Materialsl, Washington, DC, June 8–12 2008.
• Hammi, L. Tucker, P.G. Allison, T.W. Stone, M.F. Horstemeyer and E.B. Marin, “Constitutive Modeling of Compaction and Sintering for P/M Automotive Components”, PowderMet 2007 conference, Denver, CO, May 13-16 2007.
• G. Allison, Y. Hammi and M.F. Horstemeyer, “Determination of Microstructure-Property Relations for Performance and Design Optimization of the P/M Process”, PowderMet 2007 conference, Denver, CO, May 13-16 2007.
• W. Stone, L.M. Arias, Y. Hammi and M. F. Horstemeyer, “Multiscale Modeling of Powder Metallurgy Process”, PowderMet 2006, San Diego, June 17-22 2006.
• Hammi, T.Y. Stone and M.F. Horstermeyer. ‘‘Constitutive Modeling for Powder Compaction and Densification”, PM2TEC 2005 International Conference on Powder Metallurgy & Particulate Materials, June 19-23 2005, Montreal, Canada.
• Hammi, T.Y. Stone and M.F. Horstermeyer. ‘‘Constitutive Modeling of Metal Powder Behavior during Compaction”, SAE 2005 World Congress, April 11-14 2005, Detroit, Michigan.
• Solanki, K., Hammi, Y., Oglesby, D., & Horstemeyer, M. . Implementation of Internal State Variable Material Model for Crashworthiness. Proceedings of AmeriPAM 2004 User Conference, Troy, Michigan, 2004.
• Hammi, M.F. Horstermeyer and D.J. Bammann. ‘‘An Anisotropic Damage Model for Ductile Metals”, 2002 ASME International Mechanical Engineering Congress and Exposition, 17-22 November 2002, New Orleans, Louisiana.
• Hammi, M.F. Horstermeyer and D.J. Bammann. ‘‘Modeling of Anisotropic Damage for Ductile Materials in Metal Forming Processes”, 2002 ASME International Mechanical Engineering Congress and Exposition, November 2002, New Orleans, Louisiana.
• Saanouni, A. Cherouat and Y. Hammi. ‘‘Numerical Aspects of Finite Elastoplasticity with Isotropic Damage for Metal Forming”, Numerical Modeling in Damage Mechanics ‘‘NUMEDAM’00”, October 2000, Troyes, France.