Search Results - "Michopoulos, J. G."

Performance Analysis of the Mesh-Free Random Grid Method for Full-Field Synthetic Strain Measurements by Iliopoulos, A. P., Michopoulos, J. G., Andrianopoulos, N. P.

“…:  In responding to the needs of the material characterization community, the recently developed mesh‐free random grid method (MFRGM) has been exhibiting very…”
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High‐resolution optical microscopy for characterising microstructural deformation in microtensile testing by WANNI, J., MICHOPOULOS, J.G., BAGCHI, A., BANERJEE, S., BANERJEE, N., ACHUTHAN, A.

“…Summary Imaging surface deformation of a coupon specimen in microtensile testing with an optical microscope presents challenges due to the narrow depth of…”
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Nested size effects in the nanoindentation response of additively manufactured 316L stainless steel by Birnbaum, A.J., Ryou, H., Steuben, J.C., Iliopoulos, A.P., Wahl, K.J., Michopoulos, J.G.

“…•Size effects stem from the: indenter, grain size, and dislocation cells.•Varying size effects were found via analysis of annealed and unprocessed…”
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Oxygen-induced giant grain growth in Ag films by Birnbaum, A. J., Thompson, C. V., Steuben, J. C., Iliopoulos, A. P., Michopoulos, J. G.

“…Thin film crystallites typically exhibit normal or abnormal growth with maximum grain size limited by energetic and geometric constraints. Although epitaxial…”
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Additively manufactured Ti-6Al-4V replacement parts for military aircraft by Jones, R., Raman, R.K. Singh, Iliopoulos, A.P., Michopoulos, J.G., Phan, N., Peng, D.

“…This paper is motivated by the need to better understand the potential of Additively Manufactured (AM) Ti6-Al-4V replacement parts for future use on…”
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Representing crack growth in additively manufactured Ti-6Al-4V by Jones, R., Michopoulos, J.G., Iliopoulos, A.P., Singh Raman, R.K., Phan, N., Nguyen, T.

“…•Crack growth in AM Ti-6AL-4V can be modelled via a single equation.•It illustrates the importance of the threshold term in accounting for crack growth.•It…”
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Accretion for direct volumetric manufacturing via addressable resistive thermal fields by Birnbaum, A.J., Iliopoulos, A.P., Steuben, J.C., Michopoulos, J.G.

“…The vast majority of additive manufacturing methods rely on an ultra-serialized approach for building parts. Often described as “layer-by-layer,” in reality,…”
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Thermomechanical failure response of notched NiTi coupons by Iliopoulos, A.P., Steuben, J.C., Kirk, T., Baxevanis, T., Michopoulos, J.G., Lagoudas, D.C.

“…Emerging applications of shape memory alloys (SMAs) functioning as actuators in areas such as the aeronautic and automotive industries, require better…”
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Inverse Analysis of Rapid and Localized Energy Deposition by Lambrakos, S. G., Michopoulos, J. G.

“…This paper examines multiscale inverse analysis of rapid and localized energy deposition, where there exists extremely strong filtering of spatial and temporal…”
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Towards hierarchical design optimization for simultaneous composite material characterization and adjustment of the corresponding physical experiments by Michopoulos, J.G., Furukawa, T.

“…This article presents a hierarchical scheme based on a staggered design optimization approach that can simultaneously achieve both real-time design of the…”
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On a General Parameterization for Inverse Analysis of Heat Deposition Processes by Lambrakos, S.G., Michopoulos, J.G.

“…A general parameterization for inverse analysis of heat deposition processes using incomplete or minimal experimental data is presented. This parameterization…”
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Hierarchical anisotropic material response of directed energy deposited (DED) Ti-6Al-4V alloy by Wijesinghe, K., Herath, C., Michopoulos, J.G., Arnold, S.M., Achuthan, A.

“…A comprehensive study is undertaken to investigate the evolution of microscopic deformation under in-situ uniaxial tensile testing of the Directed Energy…”
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Delamination growth in polymer-matrix fibre composites and the use of fracture mechanics data for material characterisation and life prediction by Jones, R., Kinloch, A.J., Michopoulos, J.G., Brunner, A.J., Phan, N.

“…The growth of delaminations in polymer-matrix fibre composites under cyclic-fatigue loading in operational aircraft structures has always been a very important…”
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Influence of cellular subgrain feature on mechanical deformation and properties of directed energy deposited stainless steel 316 L by Wanni, J., Michopoulos, J.G., Achuthan, A.

“…The fundamental deformation mechanism responsible for the exceptional combination of strength and ductility exhibited by SS 316 L material manufactured using…”
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Top-down metacomputing with algebraic dimensionality raising for automating theory-building to enable directly computable multiphysics models by Michopoulos, J.G., Apetre, N.A., Steuben, J.C., Iliopoulos, A.P.

“…The need to address the fundamental issues associated with the computational model generation process in the context of multiphysics theories that observe…”
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Bottom-up hierarchical and categorical metacomputing for automating composition and deployment of directly computable multiphysics models by Michopoulos, J.G., Iliopoulos, A.P., Farhat, C., Avery, P., Daeninck, G., Steuben, J.C., Apetre, N.A.

“…The present paper describes a proposed solution for reducing the complexity and time required by experienced users of legacy codes for solving multiphysics…”
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The exact form of caustics in mixed-mode fracture: A comparison with approximate solutions by Theocaris, P. S., Michopoulos, J. G.

“…An exact solution of a stress function was used to determine a closed form expression for the initial curve and its respective caustic in the case of biaxial…”
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A Multiphysics Theory for the Static Contact of Deformable Conductors With Fractal Rough Surfaces by Michopoulos, John G., Young, Marcus, Iliopoulos, Athanasios

“…In this paper, we present a multifield and multiscale theory leading to derivations of electric and thermal conductivities for the interface between two rough…”
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Performance of inverse atomistic scale fracture modeling on GPGPU architectures by Iliopoulos, A.P., Michopoulos, J.G., Lambrakos, S.G., Bernstein, N.

“…► Demonstrated the implementation and feasibility of using a MD framework for solving an inverse problem on both conventional multi-core CPUs and GPGPU…”
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EM Gun Bore Life Experiments at Naval Research Laboratory by Meger, Robert A., Cairns, Richard L., Douglass, Scott R., Huhman, Brett, Neri, Jesse M., Carney, Carl J., Jones, Harry N., Cooper, Khershed, Feng, Jerry, Brintlinger, Todd H., Sprague, James A., Michopoulos, John G., Young, Marcus M., DeGiorgi, Virginia, Leung, Alan, Baucom, Jared N., Wimmer, Stephanie

“…The Naval Research Laboratory (NRL) performs basic and applied research on high power railguns as part of the US Navy EM Launcher program. The understanding of…”
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