# Nicolas Triantafyllidis | Faculty

### Short Bio

**EDUCATION**

**Brown University**

PhD Engineering

MS Applied Math

MS Engineering

**National Technical University of Greece**

Diploma Civil Engineering

**SOCIETY MEMBERSHIPS**

- American Institute of Aeronautics and Astronautics
- American Society of Mechanical Engineering
- American Society of Civil Engineering
- American Academy of Mechanics
- Society of Engineering Science

**POSITIONS HELD AT MICHIGAN**

- Professor of Aerospace Engineering
- Assistant Professor (October 1980)

### Specializations and Research Interests

Continuum mechanics. Micromechanics. Structural mechanics. Structural stability. Manufacturing process modeling, Numerical methods (f.e.m.), Geomechanics, Magneto-Electro-Mechanical coupling problems in solid.

### Teaching Interests

- Structural Mechanics I (AE 314)
- Aircraft and Spacecraft Sturctures (AE 315)
- Structural Mechanics II (AE 414)
- Theory of Plates and Shells (AE 416)
- Introduction to Finite Elements(AE 510)
- Advanced Finite Elements(AE 511)
- Nonlinear Continuum Solid Mechanics(AE 514)
- Mechanics of Composite and Microstructured Media (AE 515)
- Introduction to Structural Stability (AE 518)
- Plasticity Theory -with Prof. W. Yang (AE 519)
- Advanced Theory of Plates and Shells with Prof. R. Peek (AE 614)
- Advanced Elastic & Plastic Stabiltiy (AE 618)

### Honors and Awards

- Fellowship of the C.N.R.S. (French NSF) Awarded to foreign scientists to pursue research in France (2003)
- Southwest Mechanics Lecture Series Speaker (2001)
- Appointed Associate Editor for the ASME Journal of Applied Mechanics (2000)
- Elected to the Board of Governors of the SES (Society of Engineering Science) (1999)
- Research Fellowship Award, Ecole Polytechnique of France (1998)
- Excellence in Research Award, Aerospace Engineering Department, University of Michigan (1997)
- Fellowship of the CNRS (French NSF) awarded to foreign scientists to pursue research in French Institutions (1987-1988)
- Elected Fellow of the ASME (1996)

### Publications

- "Void Growth and Local Necking of Biaxially Stretched Sheets," (with A. Needleman), Journal Eng. Matls. & Technology, 100, 1978, pp. 164-169.
- "Effects of Third Order Elastic Constants on the Buckling of Thin Plates," (with X. Markenskoff), Intl. Journal Solids & Structures, 15, 1979, pp. 987-992.
- "Bifurcation Phenomena in Pure Bending," Journal Mech. Physics Solids, 28, 1980, pp. 221-245.
- "An Analysis of Wrinkling in the Swift Cup Test," (with A. Needleman), Journal Eng. Matls. & Technology, 102, 1980, pp. 241-248.
- "On the Emergence of Shear Bands in Plane Strain," (with R. Abeyaratne), Intl. Journal Solids & Structures, 17, 1981, pp. 1113-1134.
- "On the Development of Shear Bands in Pure Bending," (with A. Needleman & V. Tvergaard), Intl. Journal Solids & Structures, 18, 1982, pp. 121-138.
- "On the Large Deformations of Elastic Materials with Non Elliptic Strain Energy Density Functions," (with N. Kikuchi), Quarterly Appl. Math, 40, 1982, pp. 241-248.
- "Instabilities of a Finitely Deformed Fiber Reinforced Elastic Material," (with R. Abeyaratne), Journal Appl. Mech., 50, 1983, pp. 149-156.
- "On the Bifurcation and Postbifurcation Analysis of Elastic-Plastic Solids Under General Prebifurcation Conditions," Journal Mech. Physics Solids, 31, 1983, pp. 499-510.
- "An Investigation of Localization in a Porous Elastic Material Using Homogenization Theory," (with R. Abeyaratne), Journal Appl. Mech., 51, 1984, pp. 481-486.
- "Surface Instabilities in Finitely Strained Solids Under Static Loading," Intl. Journal Eng. Sci., 22, 1984, pp. 1187-1192.
- "Puckering Instability Phenomena in the Hemispherical Cup Test," Journal Mech. Physics Solids, 33, 1985, pp. 117-139.
- "Effect of Debonding on the Stability of Fiber Reinforced Composites," (with J. Barber), Journal Appl. Mech., 52, 1985, pp. 235-237.
- "On the Comparison Between Microscopic and Macroscopic Instability Mechanisms in a Class of Fiber Reinforced Composites," (with B. Maker), Journal Appl. Mech., 52, 1985, pp. 794-800.
- "Bending Effects on Flow Localization in Metallic Sheets," (with S. Samanta ), Proc. Roy. Soc. London, A 406, 1986, pp. 205-226.
- "Gradient Approach to Localization of Deformation. I. Hyperelastic Materials," (with E. Aifantis ), Journal of Elasticity, 16 , 1986, pp. 225-237.
- "An Investigation of Draw Beads in Sheet Metal Forming. I- Theoretical Formulation," (with B. Maker & S. Samanta ), Journal Eng. Matls. & Technology, 108, 1986, pp. 321-327.
- "An Investigation of Draw Beads in Sheet Metal Forming. II- Experimental Results," (with B. Maker, J. Grabb & S. Samanta ), Journal Eng. Matls. & Technology, 109, 1987, pp. 164-170.
- "Thickness Effects on the Stability of Thin Walled Structures," (with Y. J. Kwon), Journal Mech. Physics Solids, 35, 1987, pp. 643-674.
- "Plastic Bifurcation and Postbifurcation for Generalized Standard Continua," (with S. Q. Nguyen), Journal Mech. Physics Solids, 37, 1989, pp. 545-566.
- "An Experimental Verification of the Hemispherical Cup Puckering Test," (with M. Donoghue, Y. J. Kwon & R. Stevenson), Journal Eng. Matls. & Technology, 111, 1989, pp. 248-254.
- "Scale Effects in the Optimal Design of a Microstructured Medium Against Buckling," (with M. P. BendsÃ¸e), Intl. Journal Solids & Structures, 26, 1990, pp. 725-741.
- "Quelques Remarques sur Homogeneisation des Materiaux Elastiques Nonlineaires," (with G. Geymonat & S. Muller), Comptes Rendus de l' Academie des Sciences de Paris, Ser. I, 311, 1990, pp. 911-916.
- "Interfacial Instability of Density-Stratified Two-Layer Systems Under Initial Stress," (with F. Lehner), Journal Mech. Physics Solids, 41, 1993, pp. 117-142.
- "On Stability and the Worst Imperfection Shape in Solids with Nearly Simultaneous Eigenmodes," (with R. Peek), Intl. Journal Solids & Structures, 29, 1992, pp. 2281-2299.
- "Worst Shape of Imperfection for Space Trusses with Many Simultaneous Buckling Modes," (with R. Peek), Intl. Journal Solids & Structures, 29, 1992, pp. 2385-2402.
- " Homogenization for Nonlinear Elastic Materials, Microbuckling and Loss of Ellipticity," (with G. Geymonat & S. Muller), Archive. Rat. Mechanics and Analysis, 122, 1993, pp. 231-290
- "On Higher Order Gradient Continuum Theories in Nonlinear Elasticity Derivation from and Comparison to the Corresponding Discrete Models," (with S. Bardenhagen ), Journal of Elasticity, 33, 1993, pp. 259-293.
- "Comparison of Microscopic and Macroscopic Instabilities in a Class of Two Dimensional Periodic Composites ," (with W. Schnaidt ), Journal Mech. Physics Solids, 41, 1993, pp. 1533-1565.
- "Stability of a Finite-Thickness Frictional Material Layer Resting on a Viscous Half-Space," (with Y. Leroy), Journal Mech. Physics Solids, 42, 1994, pp. 51-110.
- "Derivation of Higher Order Gradient Continuum Theories in 2,3-D Non-Linear Elasticity for Periodic Lattice Models," (with S. Bardenhagen ), Journal Mech. Physics Solids, 42, 1994, pp. 111-139.
- "Post-Bifurcation and Imperfection Sensitivity of Space Trusses With Many Simultaneous Buckling Bars and a Strongly Nonlinear Prebuckling Solution," (with R. Peek), Eur. Jour. Mech. A/Solids, 14, 1995, pp. 721-745.
- "Scale Size on the Stability of Periodic Solids and the Role of Associated Higher Order Gradient Continuum Models," (with S. Bardenhagen ), Journal Mech. Physics Solids, 44, 1996, pp. 1891-1928.
- "Stability of a Frictional Cohesive Layer on a Viscous Substratum: Variational Formulation and Asymptotic Solution," (with Y. Leroy), Journal of Geophysical Research, B8, 101, 1996, pp. 17795-17811.
- "Stability of a Frictional Cohesive Layer on a Viscous Substratum: Validity of Asymptotic Solution and Influence of Material Properties," (with Y. Leroy), Journal of Geophysical Research, B9, 102, 1997, pp. 20551-20570
- "Stability of Density-Stratified Two-Layers System," (with P. Massin & Y. Leroy), Comptes Rendus de l' Academie des Sciences de Paris, Ser. IIa, 322, 1996, pp. 407-413.
- "A sufficient Condition for the Linear Instability of Strain-Rate Dependent Solids" (with P. Massin & Y. Leroy), Comptes Rendus de l' Academie des Sciences de Paris, Ser. IIb, 324, 1997, pp. 151-157.
- "Effects of Scale Size on Media with Periodic and Nearly Periodic Microstructures - I Macroscopic Properties," (with M. Schraad), Journal Appl. Mech., 64, 1997, pp. 751-762.
- "Effects of Scale Size on Media with Periodic and Nearly Periodic Microstructures - II Failure Mechanisms," (with M. Schraad), Journal Appl. Mech., 64, 1997, pp. 762-771
- "Onset of Failure in Aluminum Honeycombs Under Arbitrary In-Plane Loading," (with M. Schraad), Journal Mech. Physics Solids, 46, 1998, pp. 1089-1124
- Asymptotic Analysis of Stability for Prismatic Solids Under Axial Loads, (with W. Scherzinger ), Journal Mech. Physics Solids, 46, 1998, pp. 955-1007
- Surface Bifurcation in Anisotropic Materials with Application to Aluminum Alloys, (with M. Nestorovic & E. Chu ), Journal Appl. Mech., 66, 1999, pp. 62-68
- "On the Stability of Strain-Rate Dependent Solids I - Structural Examples, (with P. Massin & Y. Leroy), Journal Mech. Physics Solids, 47, 1999, pp. 1737-1779
- On the Stability of Rate-Dependent Solids with Application to the Uniaxial Plane Strain Test, (with M. Nestorovic & Y. Leroy), Journal Mech. Physics Solids, 48, 2000, pp. 1476-1491
- Asymptotic Stability Analysis for Sheet Metal Forming - I Theory, (with W. Scherzinger ), Journal Appl. Mech., 67, 2000, pp. 685-690
- Asymptotic Stability Analysis for Sheet Metal Forming - II Application, (with W. Scherzinger & E. Chu ), Journal Appl. Mech., 67, 2000, pp. 691-696
- Stability of Pressure-Dependent, Thermally-Induced Martensitic Transformations in Bi-Atomic Crystals , (with R. Elliott & J. Shaw), Intl. Journal Solids & Structures, 39, 2002, pp. 3845-3856
- Bifurcation and Stability of an Elastic Plate over an Inviscid and Buoyant Fluid, (with Y. Leroy & M. Guiton), Intl. Journal Solids & Structures, 39, 2002, pp. 3873-3891
- Stability of Thermally-Induced Martensitic Transformations in Bi-Atomic Lattices,(with R. Elliott & J. Shaw), J. Mech. Phys. Solids, 50, 2002, pp. 2463-2493
- Onset of Failure in Finitely Strained Layered Composites Subjected to Combined Normal and Shear Loading, (with M. Nestorovic) J. Mech. Phys. Solids 52, 2004, pp. 941-974
- Onset of Necking in Electro-magnetically Formed Rings, (with J. Waldenmyer) J. Mech. Phys. Solids 52, 2004, pp. 2127-2148
- On Finitely Strained Magneto-Rheological Elastomers, (with S. Kankanala ) J. Mech. Phys. Solids 52, 2004, pp. 2869-2908
- On the Stability of Kelvin Cell Foams Under Compressive Loads,(with L. Gong & S. Kyriakides ) J. Mech. Phys. Solids 53, 2005, pp. 771-794
- Failure Surfaces for Finitely Strained Two-Phase Periodic Solids Under Arbitrary Plane Strains, (with M. Nestorovic and M. Schraad) Journal Appl. Mech., 73, 2006, pp. 505-515
- Stability of Crystalline Solids I: Continuum and Atomic Lattice Considerations,(with R. Elliott & J. Shaw) J. Mech. Phys. Solids 54, 2006, pp. 161-192
- Stability of Crystalline Solids II: Application to Temperature-Induced Martensitic Phase Transformations in a Bi-Atomic Crystal , (with R. Elliott & J. Shaw) J. Mech. Phys. Solids 54, 2006, pp. 193-232
- "Forming Limits for Electromagnetically Expanded Aluminum Alloy Tubes: Theory and Experiment," (with J.D. Thomas, M. Seth, J. Bradley and G. Daehn) Acta Materialia, 55, 2007, pp. 2863-2873
- "Post-Bifurcation Equilibria in the Plane Strain Test for a Hyperelastic Rectangular Block," (with W.H. Scherzinger and H.-J. Huang) Intl. Journal Solids & Structures, 44, 2007, pp. 3700-3719
- "Microscopic and Macroscopic Instabilities in Finitely Strained Porous Elastomers," (with J.C. Michel, O. Lopez-Pamies and P. Ponte Castaneda) J. Mech. Phys. Solids, 55, 2007, pp. 900-938
- "Theory of Necking Localization in Unconstrained Electromagnitc Expansion of Thin Sheets," (with J.D. Thomas) Intl. Journal Solids & Structures, 44, 2007, pp. 6744-6767
- "Surface Instability of an Elastic Half Space with Material Properties Varying with Depth," (with D. Lee, J. Barber & M. Thouless), J. Mech. Phys. Solids, 56, 2008, pp. 858-868
- "Magnetoelastic Buckling of a Rectangular Block in Plane Strain," (with S. Kankanala), J. Mech. Phys. Solids, 56, 2008, pp. 1147-1169
- "Superelasticity and Stability of a Shape Memory Alloy Hexagonal Honeycomb under In-plane Compression" (with P. Michailides, J.A. Shaw & D.S. Grummon) Intl. Journal Solids & Structures, 46, 2009, pp. 2724-2738
- "On Electromagnetic Forming Processes in Finitely Strained Solids: Theory and Examples," (with J.D. Thomas), J. Mech. Phys. Solids, 57, 2009, 1391-1416
- "Comparison of Fully Coupled Modeling and Experiments for Electromagnetic Forming Processes in Finitely Strained Solids," (with J.D. Thomas, A. Vivek, G.S. Daehn & J.R. Bradley), Int. Journal of Fracture, Submitted, 2009