Presented By: Aerospace Engineering
AE Dissertation Defense by Pinar Acar
Multi-Scale Design and Optimization of Microstructures with Process-Texture-Property Identification
Research on computational modeling and multiscale design of materials has been garnering a lot of interest due to the demand for high performance materials in electronics, energy and structural applications. The primary goal of the present study is to develop a new computational approach for microstructure design for achieving a set of material properties within a designated level of uncertainty. This thesis combines the methods of uncertainty quantification (UQ) and materials design, using a unique linearization approach that is well-suited for metallic materials modeled using probabilistic descriptors such as the orientation distribution function. An analytical UQ formulation is proposed to model the uncertainties in microstructural features from experimental (electron diffraction) data as well as for inverse modeling the uncertainties in optimal microstructural features from property data. Compared to the widely preferred computational UQ algorithms the analytical model reduces the required computational time significantly as well as capturing the effect of stochasticity in microstructure design accurately. The optimal processing route, which produces materials with optimized texture and/or properties, is identified by developing reduced order models to represent the texture evolution. Examples presented include the performance improvement of Titanium aircraft panels for thermal buckling, and optimization of Fe-Ga alloys for vibration response and identification of optimal processing route for Fe-Ga alloy microstructures.
Dissertation Committee:
Chair: Prof. Veera Sundararaghavan
Cognate Member: Prof. John Allison
Members: Prof. Daniel Inman and Prof. Anthony Waas
Journal Papers
[12] P. Acar, S. Srivastava and V. Sundararaghavan, "Stochastic Design Optimization of Microstructures with Utilization of a Linear Solver," AIAA Journal, in press.
[11] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variations," AIAA Journal, in press.
[10] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Variability in Measured Pole Figures," Acta Materialia, Vol. 124, pp: 100-108, 2017.
[9] P. Acar, A. A. Vijayachandran, V. Sundararaghavan and A. M. Waas, "Fiber Path Optimization of a Symmetric Laminate with a Cutout for Thermal Buckling," Journal of Aircraft, Vol. 54, No.1, pp: 54--61, 2017.
[8] P. Acar and V. Sundararaghavan, "A Markov Random Field Approach for Modeling Spatio-Temporal Evolution of Microstructures," Modelling and Simulation in Materials Science and Engineering, Vol. 24, No. 7, 075005, 2016.
[7] P. Acar and V. Sundararaghavan, "Linear solution scheme for microstructure design with process constraints," AIAA Journal, Vol. 54, No. 12, pp: 4022-4031, 2016.
[6] P. Acar and V. Sundararaghavan, "Utilization of a Linear Solver for Multiscale Design and Optimization of Microstructures", AIAA Journal, Vol. 54, No. 5, pp: 1751--1759, 2016.
[5] M. Nikbay and P. Acar, "Aeroelastic predictions for steady and unsteady flow characteristics of the HIRENASD wing," Progress in Computational Fluid Dynamics, Vol. 16 No.1, pp: 26--37, 2016.
[4] P. Acar, A. A. Vijayachandran, V. Sundararaghavan, A. M. Waas and M. Rassaian, "Optimization of Spatially Varying Fiber Paths for a Symmetric Laminate with a Circular Cutout under Remote Uniaxial Tension," SAE Int. J. Mater. Manf., 9(1):2016, doi:10.4271/2015-01-2609.
[3] M. Nikbay and P. Acar, "Reduced order modelling for static and dynamic aeroelastic predictions with multidisciplinary approach," CEAS Aeronautical Journal, Vol.6, No.3, pp: 455--469, 2015.
[2] M. Nikbay, P. Acar and A. R. Aslan, "Development of a Nanosatellite De-Orbiting System by Reliability Based Design Optimization," Acta Astronautica, Vol.117, pp: 469--483, 2015.
[1] M. Nikbay and P. Acar, "Integrating Analytical Aeroelastic Instability Analysis into Design Optimization of Aircraft Wing Structures," TWMS Journal of Applied and Engineering Mathematics, Vol.1, No.2, pp: 237--253, 2011.
Technical Report Chapters
[2] M. Nikbay, P. Acar and Z. Zhang, "Euler Solver Based Aeroelastic Predictions for Steady and Unsteady Flow Characteristics of HIRENASD Wing, (published as a chapter in NATO-STO AVT-203 report).
[1] M. Nikbay and P. Acar, "Uncertainty Quantification for Aeroelastic Analyses of the S4T Wing," (published as a chapter in NATO-STO AVT-191 report).
Invited Talks
[5] P. Acar, "Multi-Scale Materials Design: Recent Challenges and Future Vision," Virginia Polytechnic Institute and State University, April 2017, Blacksburg, VA, USA.
[4] P. Acar, "Multi-Scale Materials Design: Recent Challenges and Future Vision," Koc University, April 2017, Istanbul, Turkey.
[3] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variability," 4th Design MURI Team Meeting, 22-23 August 2016, Pasadena, CA, USA.
[2] P. Acar and V. Sundararaghavan, "Markov Random Field for Microstructure Synthesis", 4th Design MURI Team Meeting, 22-23 August 2016, Pasadena, CA, USA.
[1] P. Acar and V. Sundararaghavan, "Sampling methods applied to material optimization problems with multiple microstructural solutions," 3rd Design MURI Team Meeting, 16-17 August 2015, Pittsburgh, PA, USA.
International Conference Proceedings
[20] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variations," 19th AIAA Non-Deterministic Approaches Conference, 9-13 January 2017, Grapevine, TX, USA.
[19] P. Acar, S. Srivastava and V. Sundararaghavan, "Stochastic Design Optimization of Microstructures with Utilization of a Linear Solver," 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 9-13 January 2017, Grapevine, TX, USA.
[18] V. Sundararaghavan and P. Acar, "Uncertainty Quantification of Microstructural Variability Using an Analytical Approach", 4th World Congress on Integrated Computational Materials Engineering (ICME 2017), MI, USA.
[17] P. Acar and V. Sundararaghavan, "Utilization of a Linear Solver for Multiscale Design and Optimization of Microstructures in an Airframe Panel Buckling Problem," 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA, USA.
[16] A. A. Vijayachandran, P. Acar, V. Sundararaghavan and A. M. Waas, "Fiber Path Optimization of a Composite Plate with a Cutout for Thermal Buckling," 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA, USA.
[15] P. Acar and V. Sundararaghavan, "Optimization of Multi-Scale Microstructure Design to Improve Macro-Level Engineering Performance in Aerospace Applications," The North American modeFRONTIER Users' Meeting, 4 November 2015, Detroit, MI, USA.
[14] P. Acar, A. A. Vijayachandran, V. Sundararaghavan, A. M. Waas and M. Rassaian, "Optimization of Spatially Varying Fiber Paths for a Symmetric Laminate with a Circular Cutout under Remote Uniaxial Tension," SAE Aerotech Congress and Exhibition, 22-24 September 2015, Seattle, WA, USA.
[13] P. Acar, A. A. Vijayachandran, V. Sundararaghavan and A. M. Waas, "Optimization of Curvilinear Fiber Paths for an Orthotropic Lamina," 15th Pan-American Congress of Applied Mechanics (PACAM XV), 18-21 May 2015, Urbana-Champaign, IL, USA.
[12] M. Nikbay and P. Acar, "Multidisciplinary Uncertainty Quantification in Aeroelastic Analyses of Semi-Span Supersonic Transport Wing," 16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Aviation Forum 2015, 22 - 26 June 2015, Dallas, TX, USA.
[11] P. Acar and M. Nikbay, "Reduced Order Modelling of High-Fidelity Computational Fluid-Structure Interaction Analysis for Aeroelastic Systems," SEECCM III (3rd South-East European Conference on Computational Mechanics-an ECCOMAS and IACM Special Interest Conference), 12-14 June 2013, Kos Island, Greece.
[10] P. Acar, M. Nikbay and A. R. Aslan, "Reliability Based Spacecraft Design Optimization: Application to a De-Orbiting Mechanism to Improve System Reliability of a CubeSat," NATO STO CSO AVT-210 Specialists Meeting - Risk and Reliability Assessment and Validation for Small Spacecraft, 13-16 May 2013, Karlstad, Sweden.
[9] P. Acar and M. Nikbay, "Steady and Unsteady Aeroelastic Computations of HIRENASD Wing for Low and High Reynolds Numbers," AIAA-2013-1800, 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 8-11, 2013, Boston, Massachusetts, USA.
[8] E. Mentes, D. C. S. Ozturk, M. Bayar, P. Acar and M. Nikbay, "Reliability Based Design Optimization of Solar Array Structure for a LEO Nano-Satellite Mission," 7th Ankara International Aerospace Conference, 11-13 September 2013, Ankara, Turkey.
[7] M. Nikbay and P. Acar, "Robust Aeroelastic Design Optimization of Wing/Store Configurations Based on Flutter Criteria," 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization (MAO) Conference, 17-19 September 2012, Indianapolis, USA.
[6] M. Nikbay, P. Acar, and A. R. Aslan "Reliability Based Design Optimization of a CubeSat De-Orbiting Mechanism," 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization (MAO) Conference, 17-19 September 2012, Indianapolis, USA.
[5] M. Nikbay and P. Acar, "Flutter Based Design Optimization of Aircraft Wings with Analytical Approach," 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 23-26 April 2012, Honolulu, USA.
[4] M. Nikbay, P. Acar, C. Kilic and Z. Zhang, "Steady and Unsteady Aeroelastic Computations of HIRENASD Wing for Low and High Reynolds Numbers," Aeroelastic Prediction Workshop-1 (AePW-1), 21-22 April 2012, Honolulu, USA.
[3] A. R. Aslan and P. Acar, "Development of a De-Orbiting Mechanism for a 3-Unit Satellite," 63rd International Astronautical Congress (IAC), 1-5 October 2012, Naples, Italy.
[2] P. Acar, M. Nikbay and A. R. Aslan, "Design Optimization of a 3-Unit Satellite De-Orbiting Mechanism," ESA Small Satellites Systems and Services the 4S Symposium, 4-8 June 2012, Portoroz, Slovenia.
[1] M. Nikbay, M. N. Kuru and P. Acar, "A CFD Based Multidisciplinary Optimization of Aeroelastic Systems with Coupled Reliability Constraints," ECCOMAS CFD and Optimization Conference, 23-25 May 2011, Antalya, Turkey.
Dissertation Committee:
Chair: Prof. Veera Sundararaghavan
Cognate Member: Prof. John Allison
Members: Prof. Daniel Inman and Prof. Anthony Waas
Journal Papers
[12] P. Acar, S. Srivastava and V. Sundararaghavan, "Stochastic Design Optimization of Microstructures with Utilization of a Linear Solver," AIAA Journal, in press.
[11] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variations," AIAA Journal, in press.
[10] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Variability in Measured Pole Figures," Acta Materialia, Vol. 124, pp: 100-108, 2017.
[9] P. Acar, A. A. Vijayachandran, V. Sundararaghavan and A. M. Waas, "Fiber Path Optimization of a Symmetric Laminate with a Cutout for Thermal Buckling," Journal of Aircraft, Vol. 54, No.1, pp: 54--61, 2017.
[8] P. Acar and V. Sundararaghavan, "A Markov Random Field Approach for Modeling Spatio-Temporal Evolution of Microstructures," Modelling and Simulation in Materials Science and Engineering, Vol. 24, No. 7, 075005, 2016.
[7] P. Acar and V. Sundararaghavan, "Linear solution scheme for microstructure design with process constraints," AIAA Journal, Vol. 54, No. 12, pp: 4022-4031, 2016.
[6] P. Acar and V. Sundararaghavan, "Utilization of a Linear Solver for Multiscale Design and Optimization of Microstructures", AIAA Journal, Vol. 54, No. 5, pp: 1751--1759, 2016.
[5] M. Nikbay and P. Acar, "Aeroelastic predictions for steady and unsteady flow characteristics of the HIRENASD wing," Progress in Computational Fluid Dynamics, Vol. 16 No.1, pp: 26--37, 2016.
[4] P. Acar, A. A. Vijayachandran, V. Sundararaghavan, A. M. Waas and M. Rassaian, "Optimization of Spatially Varying Fiber Paths for a Symmetric Laminate with a Circular Cutout under Remote Uniaxial Tension," SAE Int. J. Mater. Manf., 9(1):2016, doi:10.4271/2015-01-2609.
[3] M. Nikbay and P. Acar, "Reduced order modelling for static and dynamic aeroelastic predictions with multidisciplinary approach," CEAS Aeronautical Journal, Vol.6, No.3, pp: 455--469, 2015.
[2] M. Nikbay, P. Acar and A. R. Aslan, "Development of a Nanosatellite De-Orbiting System by Reliability Based Design Optimization," Acta Astronautica, Vol.117, pp: 469--483, 2015.
[1] M. Nikbay and P. Acar, "Integrating Analytical Aeroelastic Instability Analysis into Design Optimization of Aircraft Wing Structures," TWMS Journal of Applied and Engineering Mathematics, Vol.1, No.2, pp: 237--253, 2011.
Technical Report Chapters
[2] M. Nikbay, P. Acar and Z. Zhang, "Euler Solver Based Aeroelastic Predictions for Steady and Unsteady Flow Characteristics of HIRENASD Wing, (published as a chapter in NATO-STO AVT-203 report).
[1] M. Nikbay and P. Acar, "Uncertainty Quantification for Aeroelastic Analyses of the S4T Wing," (published as a chapter in NATO-STO AVT-191 report).
Invited Talks
[5] P. Acar, "Multi-Scale Materials Design: Recent Challenges and Future Vision," Virginia Polytechnic Institute and State University, April 2017, Blacksburg, VA, USA.
[4] P. Acar, "Multi-Scale Materials Design: Recent Challenges and Future Vision," Koc University, April 2017, Istanbul, Turkey.
[3] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variability," 4th Design MURI Team Meeting, 22-23 August 2016, Pasadena, CA, USA.
[2] P. Acar and V. Sundararaghavan, "Markov Random Field for Microstructure Synthesis", 4th Design MURI Team Meeting, 22-23 August 2016, Pasadena, CA, USA.
[1] P. Acar and V. Sundararaghavan, "Sampling methods applied to material optimization problems with multiple microstructural solutions," 3rd Design MURI Team Meeting, 16-17 August 2015, Pittsburgh, PA, USA.
International Conference Proceedings
[20] P. Acar and V. Sundararaghavan, "Uncertainty Quantification of Microstructural Properties due to Experimental Variations," 19th AIAA Non-Deterministic Approaches Conference, 9-13 January 2017, Grapevine, TX, USA.
[19] P. Acar, S. Srivastava and V. Sundararaghavan, "Stochastic Design Optimization of Microstructures with Utilization of a Linear Solver," 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 9-13 January 2017, Grapevine, TX, USA.
[18] V. Sundararaghavan and P. Acar, "Uncertainty Quantification of Microstructural Variability Using an Analytical Approach", 4th World Congress on Integrated Computational Materials Engineering (ICME 2017), MI, USA.
[17] P. Acar and V. Sundararaghavan, "Utilization of a Linear Solver for Multiscale Design and Optimization of Microstructures in an Airframe Panel Buckling Problem," 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA, USA.
[16] A. A. Vijayachandran, P. Acar, V. Sundararaghavan and A. M. Waas, "Fiber Path Optimization of a Composite Plate with a Cutout for Thermal Buckling," 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA, USA.
[15] P. Acar and V. Sundararaghavan, "Optimization of Multi-Scale Microstructure Design to Improve Macro-Level Engineering Performance in Aerospace Applications," The North American modeFRONTIER Users' Meeting, 4 November 2015, Detroit, MI, USA.
[14] P. Acar, A. A. Vijayachandran, V. Sundararaghavan, A. M. Waas and M. Rassaian, "Optimization of Spatially Varying Fiber Paths for a Symmetric Laminate with a Circular Cutout under Remote Uniaxial Tension," SAE Aerotech Congress and Exhibition, 22-24 September 2015, Seattle, WA, USA.
[13] P. Acar, A. A. Vijayachandran, V. Sundararaghavan and A. M. Waas, "Optimization of Curvilinear Fiber Paths for an Orthotropic Lamina," 15th Pan-American Congress of Applied Mechanics (PACAM XV), 18-21 May 2015, Urbana-Champaign, IL, USA.
[12] M. Nikbay and P. Acar, "Multidisciplinary Uncertainty Quantification in Aeroelastic Analyses of Semi-Span Supersonic Transport Wing," 16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Aviation Forum 2015, 22 - 26 June 2015, Dallas, TX, USA.
[11] P. Acar and M. Nikbay, "Reduced Order Modelling of High-Fidelity Computational Fluid-Structure Interaction Analysis for Aeroelastic Systems," SEECCM III (3rd South-East European Conference on Computational Mechanics-an ECCOMAS and IACM Special Interest Conference), 12-14 June 2013, Kos Island, Greece.
[10] P. Acar, M. Nikbay and A. R. Aslan, "Reliability Based Spacecraft Design Optimization: Application to a De-Orbiting Mechanism to Improve System Reliability of a CubeSat," NATO STO CSO AVT-210 Specialists Meeting - Risk and Reliability Assessment and Validation for Small Spacecraft, 13-16 May 2013, Karlstad, Sweden.
[9] P. Acar and M. Nikbay, "Steady and Unsteady Aeroelastic Computations of HIRENASD Wing for Low and High Reynolds Numbers," AIAA-2013-1800, 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, April 8-11, 2013, Boston, Massachusetts, USA.
[8] E. Mentes, D. C. S. Ozturk, M. Bayar, P. Acar and M. Nikbay, "Reliability Based Design Optimization of Solar Array Structure for a LEO Nano-Satellite Mission," 7th Ankara International Aerospace Conference, 11-13 September 2013, Ankara, Turkey.
[7] M. Nikbay and P. Acar, "Robust Aeroelastic Design Optimization of Wing/Store Configurations Based on Flutter Criteria," 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization (MAO) Conference, 17-19 September 2012, Indianapolis, USA.
[6] M. Nikbay, P. Acar, and A. R. Aslan "Reliability Based Design Optimization of a CubeSat De-Orbiting Mechanism," 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization (MAO) Conference, 17-19 September 2012, Indianapolis, USA.
[5] M. Nikbay and P. Acar, "Flutter Based Design Optimization of Aircraft Wings with Analytical Approach," 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 23-26 April 2012, Honolulu, USA.
[4] M. Nikbay, P. Acar, C. Kilic and Z. Zhang, "Steady and Unsteady Aeroelastic Computations of HIRENASD Wing for Low and High Reynolds Numbers," Aeroelastic Prediction Workshop-1 (AePW-1), 21-22 April 2012, Honolulu, USA.
[3] A. R. Aslan and P. Acar, "Development of a De-Orbiting Mechanism for a 3-Unit Satellite," 63rd International Astronautical Congress (IAC), 1-5 October 2012, Naples, Italy.
[2] P. Acar, M. Nikbay and A. R. Aslan, "Design Optimization of a 3-Unit Satellite De-Orbiting Mechanism," ESA Small Satellites Systems and Services the 4S Symposium, 4-8 June 2012, Portoroz, Slovenia.
[1] M. Nikbay, M. N. Kuru and P. Acar, "A CFD Based Multidisciplinary Optimization of Aeroelastic Systems with Coupled Reliability Constraints," ECCOMAS CFD and Optimization Conference, 23-25 May 2011, Antalya, Turkey.
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