Yannis P Korkolis, Associate Professor
Yannis P Korkolis, Associate Professor
Prof. Korkolis joined the department in Fall 2009. He is trained as a mechanical engineer with emphasis on mechanical constructions and on manufacturing, while his graduate studies are in solid mechanics. He also has 2 years of industrial experience. His research aims at interfacing mechanics of materials, constitutive modeling and failure, using numerical methods and experimental techniques. It is motivated by – but not limited to – actual manufacturing problems, such as those encountered in sheet metal forming and tube hydroforming. He has worked on constitutive modeling of advanced aluminum alloys, formability and failure prediction, modeling of machining operations, tube hydroforming and microforming processes.
Prof. Korkolis is the recipient of a 2012 CAREER Award from the National Science Foundation (NSF). His research is further supported by grants from NSF, Office of Naval Research, Dept. of Commerce, Ford Motor Company and the Auto/Steel Partnership.
Prof. Korkolis has taught ME 542 - Mechanical Dissection and Design Analysis, ME 643 – Machine Design, ME 795/895 - Materials Processing in Manufacturing, ME 777/877 - Computer-Aided Engineering, ME 927 - Theory of Plasticity and ME 795/995 - Experimental Mechanics while at UNH.
For more details, please take a look at Prof. Korkolis' C.V
Prof. Korkolis' areas of reasearch are the following:
- Plasticity and constitutive modeling of materials.
- Ductile fracture and formability. Instabilities and wrinkling.
- Forming of light-weight materials (e.g., high rate forming processes, sheet metal forming, tube hydroforming).
His present research efforts are summarized below:
H.Y. Gong, S. Wang, P. Knysh and Y.P. Korkolis, "Experimental investigation of the mechanical response of laser-welded dissimiar blanks from advanced- and ultra-high-strength steel", (submitted to Materials & Design)
H. Tian, B. Brownell, M. Baral and Y.P. Korkolis, "Earing in cup-drawing of anisotropic Al-6022-T4 sheets", (submitted to International Journal of Mechanical Sciences)
P.W. Ripley and Y.P. Korkolis, “Multiaxial deformation apparatus for testing of microtubes under combined axial-force and internal-pressure", (under revision for Experimental Mechanics)
Y.P. Korkolis, N. Deng and T. Kuwabara, “On the non-linear unloading behavior of a biaxially loaded dual-phase steel sheet” (in preparation)
Y.P. Korkolis, B. Brownell, S. Coppieters and H. Tian, "Hole-expansion of anisotropic Al-6022-T4 sheets using a flat-headed punch", (in preparation)
C.P. Dick and Y.P. Korkolis, "Anisotropy of thin-walled tubes by a new method of combined tension and shear loading", International Journal of Plasticity, 71 (2015) 87-112
C.P. Nikhare, Y.P. Korkolis and B.L. Kinsey "Formability enhancement in titanium tube-flaring by manipulating the deformation path”, Journal of Manufacturing Science and Engineering-ASME, (2015 – in press)
P. Knysh and Y.P. Korkolis, "Determination of the fraction of plastic work converted into heat in metals", Mechanics of Materials 86 (2015), 71-80
N. Deng, T. Kuwabara and Y.P. Korkolis, “Cruciform specimen design and verification for constitutive identification of anisotropic sheets”, Experimental Mechanics 55 (2015), 1005-1022
C.P. Dick and Y.P. Korkolis, “Strength and ductility evaluation of cold-welded seams in aluminum tubes extruded through porthole dies”, Materials & Design 67 (2015), 631-636
M.G. Lee, Y.P. Korkolis and J.H. Kim, “Recent developments in hydroforming technology”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 229(4), 572-596 (review article for the special issue on TubeHydro 2013 Conference)
M. Knezevic, M. Jahedi, Y.P. Korkolis and I.J. Beyerlein, “Material based design of the extrusion of bimetallic tubes”, Computational Materials Science 95 (2014), 63-73 link
N.H. Moser, T.S. Gross and Y.P. Korkolis, “Martensite formation in conventional and isothermal tension of 304 austenitic stainless steel measured by x-ray diffraction”, Metallurgical and Materials Transactions - A 45 (2014), 4891-4896 link
C.P. Dick and Y.P. Korkolis, “Mechanics and full-field deformation study of the ring hoop tension test”, International Journal of Solids and Structures, 51 (2014), 3042-3057 link
J.F. Wilson, B.L. Kinsey and Y.P. Korkolis, “Development of a biaxial loading frame for sheet metal”, Journal of Manufacturing Processes–SME, 15 (2013), 580-585 link
N. Deng and Y.P. Korkolis, “Numerical study of the lateral crushing and reinflation of stainless steel and aluminum tubes”, Journal of Manufacturing Processes – SME, 15 (2013), 242-255 link
G.W. Cullen and Y.P. Korkolis, “Ductility of 304 stainless steel under pulsed uniaxial loading”, International Journal of Solids and Structures, 50 (2013), 1621-1633 link
L. Wang, Y.P. Korkolis and B.L. Kinsey, “Investigation of strain gradients and magnitudes during microbending”, Journal of Manufacturing Science and Engineering-ASME, 134 (2012), 041011-1/-9 link
Y.P. Korkolis and S. Kyriakides, “Hydroforming of anisotropic aluminum tubes. Part II: analysis”, International Journal of Mechanical Sciences, 53 (2011), 83-90 link
Y.P. Korkolis and S. Kyriakides, “Hydroforming of anisotropic aluminum tubes. Part I: experiments”, International Journal of Mechanical Sciences, 53 (2011), 75-82 link
T. Giagmouris, S. Kyriakides, Y.P. Korkolis and L.-H. Lee, “On the localization and failure in aluminum shells due to crushing-induced bending and tension”, International Journal of Solids and Structures, 47 (2010), 2680-2692 link
Y.P. Korkolis, S. Kyriakides, T. Giagmouris and L.-H. Lee, “Constitutive modeling and rupture predictions of Al-6061-T6 tubes under biaxial loading paths”, Journal of Applied Mechanics-ASME, 77 (2010), 064501-1/-5 link
Y.P. Korkolis and S. Kyriakides, “Path-dependent failure of inflated aluminum tubes”, International Journal of Plasticity, 25/11 (2009) 2059-2080 link
Y.P. Korkolis and S. Kyriakides, “Inflation and burst of anisotropic aluminum tubes, part II: an advanced yield function including deformation-induced anisotropy”, International Journal of Plasticity, 24/9 (2008) 1625-1637 link
Y.P. Korkolis and S. Kyriakides, “Inflation and burst of anisotropic aluminum tubes for hydroforming applications”, International Journal of Plasticity, 24/3 (2008) 509-543 link
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