Ajit Achuthan

Education Background

Ph.D. - 2004
Purdue University
M.E. - 2000
National University of Singapore
M.S. - 1998
Indian Institute of Technology
B.Tech. - 1994
Calicut University

Courses Taught

Theory of elasticity
Wave propagation in solids
Computational materials science
Aircraft structures - 1
Aircraft structures - 2
Mechanics of machine elements
Dynamical systems
Strength of materials

Research Interests

Dr Achuthan’s expertise is in the areas of solid mechanics and advanced materials. His group applies the principles of solid mechanics to address critical challenges in various technological applications by developing innovative solutions. Currently, his research interest is primarily in the area of the additive manufacturing of metals. He is particularly interested in studying the mechanism of microstructure evolution, the role of the evolved microstructure on mechanical properties, and various micro-scale deformation mechanisms. The insight gained from these studies is then used to develop appropriate constitutive models. Advanced experimental and computational tools are used/developed to help the investigation. These tools include: 1) material characterization techniques such as optical imaging, SEM and nanoindentation, 2) continuum based computational models such as crystal plasticity based constitutive models, finite element analysis (FEA) models, and 3) molecular dynamics (MD) models.

Awards

2024 Plenary speaker, Structural Engineering Convention (SEC2024), at National Institute of Technology Tiruchirappalli (NITT), India, 12-14, December.
2024 Acta student paper award (Janith Wanni - Graduate Student), “Columnar grain morphology and mechanical anisotropy of face-centered cubic metals and alloys” in Scripta Materialia
2017 The A. F. Davis Silver Medal by the American Welding Society for the excellence of a paper in the field of Structure Design
2017 Summer Faculty Fellow at U.S. Naval Research Laboratory, Washington DC
2016-2017 Visiting Faculty Fellow at U.S. Naval Research Laboratory, Washington DC
2012 NASA Glenn Summer Faculty Research Fellowship
2011 “Honorable Mention” awarded for the Poster presented at ASME IMECE 2011 (Top 3 posters out of 200+ posters in the session)

Patents

William Andrew Hennessy, Habib Vafi, Donald Earl Castleberry, Michael John Utschig, Mahadevan Balasubramaniam, Jie Jiang, Virendra Vilas Gaikwad, Ajit Achuthan, Le Yan: Digital x-ray detectors. General Electric Jan, 15 2009: US 20090014659, US 7495227
William James Premerlani, Kanakasabapathi Subramanian, Christopher Keimel, John N Park, Ajit Achuthan, Wensen Wang, Joshua Isaac Wright, Kristina Margaret Korosi, Somashekhar Basavaraj: Micro-electromechanical system based soft switching. General Electric Dec, 15 2009: US 7633725, : US 20070139830
Marko Baller, Marcin Alexy, Glenn S Claydon, Peter Joseph Codella, Stacey Kennerly, Kuna Kishore, Anis Zribi, Guiju Song, Shivappa Goravar, Ajit Achuthan: Early fouling detection. General Electric Jan, 26 2010: US 7652586, US 20080041139
Anis Zribi, Min-Yi Shih, Guiju Song, Ajit Achuthan, Glenn Scott Claydon, Stacey Joy Kennerly, Kuna Venkat Satya Rama Kishore, Jianming Zheng, Kevin George Harding, Hua Xia: Interferometer-based real time early fouling detection system and method. General Electric Sep, 23 2008: US 7428055, US 20080084565
Stephen Daley Arthur, Kanakasabapathi Subramanian, William James Premerlani, John N Park, Ajit Achuthan, Wensen Wang, Joshua Isaac Wright, Kristina Margaret Korosi, Somashekhar Basavaraj: Micro-electromechanical system based arc-less switching. General Electric Jun, 21 2007: US 20070139829

Publications

Selected Publications

Journals

(Book Chapter) “Multiphysics Integrated Computational Materials Engineering Linking Additive Manufacturing Process Parameters with Part Performance”, https://doi.org/10.1115/1.862025_ch10, Book chapter in “Advances in Computers and Information in Engineering Research, Volume 2” https://doi.org/10.1115/1.862025, 2021

N. Wijesinghe and A. Achuthan*, “An Optimized Multi-step Finite Element Analysis Framework for Simulating Additive Manufacturing Processes”, (To be submitted)

K. Wijesinghe†, C. Herath†, A. Iliopoulos, J. G. Michopoulos, S. M. Arnold, and A. Achuthan*, "Enhancing mechanical properties of Directed Energy Deposited Ti–6Al–4V through Boron addition " (under review, Journal of Alloys and Compounds)

C. Herath†, K. Wijesinghe†, A. Iliopoulos, J. G. Michopoulos, S. M. Arnold, and A. Achuthan*, “A Microstructure-Informed Constitutive Modeling Framework for α + β Ti Alloys”, International Journal of Plasticity, Vol 183, 2024, 104163. https://doi.org/10.1016/j.ijplas.2024.104163
O. Oyerinde, I. Mastorakos, A. Achuthan, P. Yuya*, Comparative Investigation of Process-induced Transformations and Diffusional Mechanisms in Additively Manufactured AlCoCrFeNi High-Entropy Alloy, Metallography, Microstructure, and Analysis,
K. Wijesinghe†, C. Herath†, J. G. Michopoulos, S. M. Arnold, and A. Achuthan*, " Hierarchical Anisotropic Material Response of Directed Energy Deposited (DED) Ti-6Al-4V alloy," Acta Materialia, Vol 276, 2024, 120080,
R. Mazruee Sebdani, J. D. Gale, H. K. Bilan, A. Achuthan*, “In-situ ultrasonic impact treatment (UIT) to improve the fatigue properties of laser powder bed fusion (LPBF) manufactured Inconel 718”, Journal of Materials Chemistry and Physics, Vol 322, 2024, 129595,
R. Mazruee Sebdani, H. K. Bilan, J. D. Gale, J. Wanni, G. Madireddy, M. P. Sealy, A. Achuthan*, “Ultrasonic Impact Treatment (UIT) Combined with Powder Bed Fusion (PBF) Process for Precipitation Hardened Martensitic Steels”, Additive Manufacturing, Vol 84, 2024, 104078,
C. Herath†, J. Wanni†, S. M. Arnold, and A. Achuthan*, “A Generalized Microstructure-informed Constitutive Modeling Framework for Hierarchical Materials Containing Cellular Network and Scattered Subgrain Features”, International Journal of Mechanical Sciences, Vol 261, 2024, 108691
J. Wanni†, K. Wijesinghe†, and A. Achuthan*, “Columnar grain morphology and mechanical anisotropy of face-centered cubic metals and alloys”, Scripta Materialia, Vol 236, 2023, 115684,
J. Wanni†, A. Colak, and A. Achuthan*, “Subgrain Microstructural Features in Directed Energy Deposited Stainless Steel 316L: The Influence of Morphology on Mechanical Properties”, Materials Science and Engineering A, Vol 880, 2023, 145215,
J. Wanni† and A. Achuthan*, “Hetero-deformation induced (HDI) strengthening in directed energy deposited SS316L: A nanoindentation-based investigation,” Materials Science and Engineering: A, Vol 860, 2022, 144280,
J. Wanni†, J. G. Michopoulos and A. Achuthan*, "Influence of Cellular Subgrain Feature on Mechanical Deformation and Properties of Directed Energy Deposited Stainless Steel 316L," Additive Manufacturing, 51, (2022), 102603,
KLM Avegnon, P Noll, MR Uddin, G Madireddy, RE Williams, A Achuthan, and MP Sealy, “Use of energy consumption during milling to fill a measurement gap in hybrid additive manufacturing,” Additive Manufacturing, 46, (2021),102167,
K. Wijesinghe†, J. Wanni†, N. K. Banerjee, S. Banerjee, and A. Achuthan*, "Characterization of microscopic deformation of materials using deep learning algorithms," Materials and Design, vol. 208, p. 109926, (2021),
J. Wanni†, J. G. Michopoulos, A. Bagchi, S. Banerjee, N. Banerjee, and A. Achuthan*, “High‐resolution optical microscopy for characterising microstructural deformation in microtensile testing”, Journal of Microscopy, Vol 281(3), pp 202-213, (2021)
A. Achuthan* and S. A. Jayanath†, “Stress Analysis of Variable Ram Blowout Prevention Valves,” SPE Drilling & Completion, 36(03), pp 647-657, (2021),
S. A. Jayanath† and A. Achuthan*, “A computationally efficient hybrid model for simulating the additive manufacturing process of metals”, International Journal of Mechanical Sciences, Vol 160, pp 255-269, (2019)
S. A. Jayanath† and A. Achuthan*, “A Computationally efficient Finite Element Framework to Simulate Additive Manufacturing Processes”, Journal of Manufacturing Science and Engineering, Vol 140(4), (2018), Art. #041009 (doi:10.1115/1.4039092)
J Gale† and A Achuthan*, “Application of Ultrasonic Peening during DMLS Production of 316L Stainless Steel and its Effect on Material Behavior ”, Rapid prototyping Journal, Vol 23(6), (2017), pp 1185-1194
M. G. Moghaddam†, A. Achuthan*, B. A. Bednarcyk, S. M. Arnold and E. J. Pineda, “Grain size dependent crystal plasticity constitutive model for polycrystal materials”, Materials Science and Engineering: A, 703, (2017), pp 521-532
H. Eisazadeh†, J. Bunn, H. E. Coules, A. Achuthan, J. Goldak, and D. K Aidun*, “A residual stress study in similar and dissimilar welds”, Welding Journal, 95(4), (2016)
M. G. Moghaddam†, A. Achuthan*, B. A. Bednarcyk, S. M. Arnold and E. J. Pineda, “A Multi-scale Computational Model Combining Single Crystal Plasticity Constitutive Model with Generalized Method of Cells (GMC) for Metallic Polycrystals”, Materials, 9(5), (2016), pp 335
M. G. Moghaddam†, A. Achuthan*, B. A. Bednarcyk, S. M. Arnold and E. J. Pineda, “Development of a precipitate size-dependent crystal plasticity constitutive model for two-phase materials and its implementation on a multi-scale computational framework”, Materials Science and Engineering: A, 651, (2016), pp 893-903
S. A. Jayanath†, A. Achuthan*, A. Mashue and M. Huang, “A subscale experimental test method to characterize extrusion-based elastomer seals”, Journal of Tribology, 138(3), (2016)
H. Eisazadeh†, A. Achuthan, J. Goldak, and D. K Aidun*, “Effect of material properties and mechanical tensioning load on residual stress formation in GTA 304-A36 dissimilar weld”, Journal of Materials Processing Technology, 222,(2015), pp 344-355
L. Jones†, A. Achuthan, and B. D. Erath*, “Modal response of a computational vocal fold model with a substrate layer of adipose tissue”, Journal of the Acoustical Society of America, 137(2), (2015), 158-164
O. Ait Maatallah†, A. Achuthan*, K. Janoyan, and P Marzocca, “Recursive wind speed forecasting based on Hammerstein auto-regressive model”, Applied Energy, 145, (2015), pp 191-197
M. G. Moghaddam†, A. Achuthan*, B. A. Bednarcyk, S. M. Arnold, and E. J. Pineda, “A Multi-scale Computational Model using Generalized Method of Cells (GMC) Homogenization for Multi-Phase Single Crystal Metals”, Computational Materials Science, 96,(2015), pp 44-55.
A. Ukwatta† and A. Achuthan*, “A molecular dynamics (MD) simulation study to investigate the role of existing dislocations on the incipient plasticity under nanoindentation”, Computational Materials Science, 91,(2014), pp 329-338.
J. D. Gale†, A. Achuthan*, and D. J. Morrison, “Indentation Size Effect (ISE) in Copper Subjected to Severe Plastic Deformation (SPD)”, Metallurgical and Materials Transactions A, 45(5), (2014), 2487-2497.
J. D. Gale† and A. Achuthan*, “The effect of work-hardening and pile-up on nanoindentation measurements”, Journal of Materials Science, 49(14), (2014), 5066-5075.
S. Bird*, A. Achuthan, O. Ait Maatallah†, W. Hu†, K. D. Janoyan, A. Kwasinski, J. N. Matthews, D. Mayhew, J. Owen, P. Marzocca. “Distributed (green) data centers: A new concept for energy, computing, and telecommunications”, Energy for Sustainable Development, (2014)
T. J. Arsenault†, A. Achuthan*, P. Marzocca, C. Grappasonni, G. Coppotelli. Development of a FBG based distributed strain sensor system for wind turbine structural health monitoring. Smart Materials and Structures, 22(7), (2013), 075027.
Z. Iverson†, A. Achuthan*, P. Marzocca, D. Aidun. “Optimal design of hybrid renewable energy systems (HRES) using hydrogen storage technology for data center applications”, Renewable Energy, 52, (2013), 79–87.
A. Achuthan, C. T. Sun*. A study of mechanisms of domain switching in a ferroelectric material via loading rate effect. Acta Materialia, 57(13), (2009), 3868–3875.
A. Achuthan and C. T. Sun*, “Domain switching in ferroelectric ceramic materials under combined loads”, Journal of Applied Physics, 97(11), (2005), 114103.
T. Sun* and A. Achuthan, “Domain-switching criteria for ferroelectric materials subjected to electrical and mechanical loads”, Journal of the American Ceramic Society, 87(3), (2004), 395-400.
A. Achuthan, A. K. Keng* and W. C. Wang, “Shape control of statically indeterminate beams with piezoelectric actuators”, Mechanics of Advanced Materials and Structures, 10(2), (2003), 145-160.
A. Achuthan, A. K. Keng and W. C. Wang*, “Shape control of coupled nonlinear piezoelectric beams”, Smart Materials and Structures 10(5), (2001), 914
A. Achuthan, A. K. Keng and W. C. Wang*, “Shape control of laminated cantilevered beams with piezoelectric actuators”, Journal of Intelligent Material Systems and Structures 10(2), (1999), 164-175.

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