Publications
188 results found
Balint DS, Wang S, Lin J, 2010, Size Effects in Micro-Forming, STEEL RESEARCH INTERNATIONAL, Vol: 81, Pages: 1229-1232, ISSN: 1611-3683
Zhan L, Lin J, Ho KC, et al., 2010, Prediction of Springback in Creep Age Forming of Aluminum Alloy Plate, STEEL RESEARCH INTERNATIONAL, Vol: 81, Pages: 1388-1391, ISSN: 1611-3683
Mohamed M, Foster A, Wang L, et al., 2010, Formability for Hot Stamping of Al-Alloy Panel Parts, STEEL RESEARCH INTERNATIONAL, Vol: 81, Pages: 659-662, ISSN: 1611-3683
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- Citations: 1
Ali A-H, Balint DS, Temple JAG, et al., 2010, QUANTIFYING AND IMPROVING THE RELIABILITY OF NDE THROUGH MODELING MANUAL ULTRASONIC INSPECTIONS, 36th Annual Review of Progress in Quantitative Nondestructive Evaluation, Publisher: AMER INST PHYSICS, Pages: 1949-1956, ISSN: 0094-243X
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- Citations: 1
Luz AMG, Balint D, Nikbin K, 2010, A MULTISCALE NDT SYSTEM FOR DAMAGE DETECTION IN THERMAL BARRIER COATINGS, ASME International Mechanical Engineering Congress and Exposition, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 299-306
Luz AMG, Balint D, Nikbin K, 2009, A multiscale NDT system for damage detection in thermal barrier coatings, Materials Science and Technology Conference and Exhibition 2009, MS and T'09, Vol: 3, Pages: 1951-1960
Nondestructive diagnostic tools that could reliably probe the subsurface damage state of TBCs are essential to take full advantage of these systems. In this contribution, a multiscale NDT system that combines imaging- and laser-based methods is presented. Mid-infrared reflectance and infrared tomography were used to predict the overall lifetime of the coated component. When TBCs approach the end of life, micro-crack nucleation and propagation increases the amount of reflected light. This rise in reflectance was correlated with the lifetime of the component using a neural network. Photoluminescence piezospectroscopy was subsequently used to examine the hot spots identified in the image analysis. Damage leads to a relaxation of the local stress which is in turn reflected in the luminescence spectrum shape. Finite element simulation of the luminescence spectrum was used to identify the most suitable spectral parameters for damage detection, improving the reliability of photoluminescence piezospectroscopy as a failure assessment tool.
Luz A, Balint D, Nikbin K, 2009, Finite element simulation of the luminescence spectra in thermal barrier coatings, 12th International Conference on Fracture 2009, ICF-12, Vol: 1, Pages: 285-293
Thermal barrier coatings (TBCs) deposited on the superalloy turbine blades can lower the temperature of the substrate by 100-300°C, allowing an increase in the turbine inlet temperature. However, TBCs have durability problems due to the significant thermal mismatch between the coating and substrate, which leads to crack nucleation and propagation at the interface and subsequent coating delamination. Luminescence spectroscopy can be employed to measure the residual stress in alumina ceramics in a non-destructive way. In this paper a numerical simulation of the crack development within TBC systems is presented. A two dimensional periodic unit cell is used to examine the evolution of the stress distribution in TBCs during thermal cycling. The stress field calculated by the finite element analysis is used to predict the luminescence spectra for a variety of cracking scenarios, in order to evaluate the potential of this technique as a nondestructive tool for lifetime prediction of TBCs.
Wang S, Zhuang W, Balint DS, et al., 2009, A crystal plasticity study of the necking of micro-films under tension, Journal of Multiscale Modeling, Vol: 1, Pages: 331-345, ISSN: 1756-9737
An integrated crystal viscoplastic modeling process has been developed to account for the effect of microstructure in the mechanical response of polycrystalline materials. Grain distributions, including size, shape and orientation, are generated automatically based on probability theories using VGRAIN software. For each set of control parameters (average, maximum and minimum grain size) used in the micro-film simulations, six grain orientation patterns were generated randomly for a micro-film based on a gamma distribution; a large number of analyses have been carried out to account for statistical variations in the spatial pattern of grain orientations. The simulations are used to investigate the effects of grain size and orientation on necking and flow stress in stainless steel under uniaxial tension, and to quantify the extent that variability in the spatial distribution of orientations affects the predictions. Based on the numerical studies, a map was generated indicating under what circumstances macro-mechanics theory can be used and when Crystal Plasticity (CP) theory must be used to ensure the accuracy of the analysis; if the theories are not used appropriately, huge errors can be expected. © 2009 Imperial College Press.
Vecchione N, Wasmer K, Balint DS, et al., 2009, Characterization of EB-PVD yttrium-stabilised zirconia by nanoindentation, Surface and Coatings Technology, Vol: 203, Pages: 1743-1747
Luz A, Balint D, Nikbin K, 2009, Lifetime Prediction of Thermal Barrier Coatings Using Computational, Experimental and Non-Destructive Tools, 138th TMS Annual Meeting and Exhibition, Publisher: MINERALS, METALS & MATERIALS SOC, Pages: 203-210
Lin J, Zhuang W, Wang S, et al., 2009, An integrated micromechanics modelling approach for micro-forming simulation, Plasticity 2009, Publisher: Neat Press USA, Pages: 118-120
Wang S, Zhuang W, Balint D, et al., 2009, A virtual crystal plasticity simulation tool for micro-forming, Mesomechanics 2009 Conference, Publisher: ELSEVIER SCIENCE BV, Pages: 75-78, ISSN: 1877-7058
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- Citations: 10
Balint DS, Deshpande VS, Needleman A, et al., 2008, Discrete dislocation plasticity analysis of the size dependence of the flow strength of polycrystals, International Journal of Plasticity, Vol: 24, Pages: 2149-2172
The grain size dependence of the flow strength of polycrystals is analyzed using plane strain, discrete dislocation plasticity. Dislocations are modeled as line singularities in a linear elastic solid and plasticity occurs through the collective motion of large numbers of dislocations. Constitutive rules are used to model lattice resistance to dislocation motion, as well as dislocation nucleation, dislocation annihilation and the interaction with obstacles. The materials analyzed consist of micron scale grains having either one or three slip systems and two types of grain arrangements: either a checkerboard pattern or randomly dispersed with a specified volume fraction. Calculations are carried out for materials with either a high density of dislocation sources or a low density of dislocation sources. In all cases, the grain boundaries are taken to be impenetrable to dislocations. A Hall–Petch type relation is predicted with Hall–Petch exponents ranging from 0.3 to 1.6 depending on the number of slip systems, the grain arrangement, the dislocation source density and the range of grain sizes to which a Hall–Petch expression is fit. The grain size dependence of the flow strength is obtained even when no slip incompatibility exists between grains suggesting that slip blocking/transmission governs the Hall–Petch effect in the simulations.
Soutas-Little RW, Inman DJ, Balint DS, 2008, A MATLAB Manual for Engineering Mechanics: Dynamics - Computational Edition, ISBN: 9780495296089
Soutas-Little RW, Inman DJ, Balint DS, 2008, A Maple Manual for Engineering Mechanics: Dynamics - Computational Edition, ISBN: 9780495296102
Soutas-Little RW, Inman DJ, Balint DS, 2008, A Mathcad Manual for Engineering Mechanics: Dynamics - Computational Edition, ISBN: 9780495296096
Soutas-Little RW, Inman DJ, Balint DS, 2008, Engineering Mechanics: Dynamics - Computational Edition, ISBN: 9780534548858
Soutas-Little RW, Inman DJ, Balint DS, 2008, A Mathematica Manual for Engineering Mechanics: Dynamics - Computational Edition, ISBN: 9780495295990
Deshpande VS, Balint DS, Needleman A, et al., 2007, Size effects in single asperity frictional contacts, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, Vol: 15, Pages: S97-S108, ISSN: 0965-0393
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- Citations: 15
Soutas-Little RW, Inman DJ, Balint DS, 2007, Engineering Mechanics: Statics, International Student Edition, Toronto, Publisher: Nelson, ISBN: 978-0-495-24483-7
Soutas-Little RW, Inman DJ, Balint DS, 2007, A MATLAB Manual for Engineering Mechanics: Statics - Computational Edition, ISBN: 9780495295938
Soutas-Little RW, Inman DJ, Balint DS, 2007, A Mathematica Manual for Engineering Mechanics: Statics - Computational Edition, ISBN: 9780495296072
Soutas-Little RW, Inman DJ, Balint DS, 2007, A Maple Manual for Engineering Mechanics: Statics - Computational Edition, ISBN: 9780495296065
Soutas-Little RW, Inman DJ, Balint DS, 2007, A Mathcad Manual for Engineering Mechanics: Statics - Computational Edition, ISBN: 9780495295945
Soutas-Little RW, Inman DJ, Balint DS, 2007, Engineering Mechanics: Statics - Computational Edition - SI Version, ISBN: 9780495438113
Balint DS, Deshpande VS, Needleman A, et al., 2006, Discrete dislocation plasticity analysis of the wedge indentation of films, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, Vol: 54, Pages: 2281-2303, ISSN: 0022-5096
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- Citations: 77
Balint DS, Xu T, Hutchinson JW, et al., 2006, Influence of bond coat thickness on the cyclic rumpling of thermally grown oxides, ACTA MATERIALIA, Vol: 54, Pages: 1815-1820, ISSN: 1359-6454
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- Citations: 47
Balint DS, Deshpande VS, Needleman A, et al., 2006, Size effects in uniaxial deformation of single and polycrystals: a discrete dislocation plasticity analysis, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, Vol: 14, Pages: 409-422, ISSN: 0965-0393
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- Citations: 96
Balint DS, Deshpande VS, Needleman A, et al., 2005, Modeling fatigue crack growth in crystalline solids with discrete dislocation plasticity, 11th International Conference on Fracture 2005, ICF11, Vol: 4, Pages: 2517-2521
Analyses of crack growth under cyclic loading conditions are discussed where plastic flow arises from the motion of large numbers of discrete dislocations and the fracture properties are embedded in a cohesive surface constitutive relation. The formulation is the same as used to analyse crack growth under monotonic loading conditions, differing only in the remote loading being a cyclic function of time. Fatigue, i.e. crack growth in cyclic loading at a driving force for which the crack would have arrested under monotonic loading, emerges in the simulations as a consequence of the evolution of internal stresses associated with the irreversibility of the dislocation motion. A fatigue threshold, Paris law behaviour, striations, the accelerated growth of short cracks and the scaling with material properties are outcomes of the calculations. Results for single crystals and polycrystals will be discussed.
Balint DS, Deshpande VS, Needleman A, et al., 2005, Discrete dislocation plasticity analysis of crack-tip fields in polycrystalline materials, PHILOSOPHICAL MAGAZINE, Vol: 85, Pages: 3047-3071, ISSN: 1478-6435
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- Citations: 15
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