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Darren J. Hartl
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Proceedings Papers

Graph-Based Interpretation of L-System Encodings Toward Aeroelastic Topology Optimization of a Morphing Airfoil in Supersonic Flow

Brent R. Bielefeldt, Darren J. Hartl, Joshua D. Hodson, Gregory W. Reich, Philip S. Beran, Alexander M. Pankonien, Joshua D. Deaton
Proc. ASME. SMASIS2019, ASME 2019 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, V001T04A013, September 9–11, 2019
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2019-5609
https://doi.org/10.1115/SMASIS2019-5609
View Paper titled, Graph-Based Interpretation of L-System Encodings Toward Aeroelastic Topology Optimization of a Morphing Airfoil in Supersonic Flow
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Topics: Airfoils, Optimization, Supersonic flow, Topology, Design, Actuators, Aircraft, Algorithms, Biomimetics, Spar platforms
Journal Articles

L-System-Generated Mechanism Topology Optimization Using Graph-Based Interpretation

Brent R. Bielefeldt, Ergun Akleman, Gregory W. Reich, Philip S. Beran, Darren J. Hartl
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. April 2019, 11(2): 020905.
Paper No: JMR-18-1369
https://doi.org/10.1115/1.4042512
Published Online: February 22, 2019
View Article titled, L-System-Generated Mechanism Topology Optimization Using Graph-Based Interpretation
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Topics: Design, Optimization, Topology
Proceedings Papers

L-System-Generated Topology Optimization of Compliant Mechanisms Using Graph-Based Interpretation

Brent R. Bielefeldt, Darren J. Hartl, Ergun Akleman
Proc. ASME. IDETC-CIE2018, Volume 5B: 42nd Mechanisms and Robotics Conference, V05BT07A001, August 26–29, 2018
Publisher: American Society of Mechanical Engineers
Paper No: DETC2018-85225
https://doi.org/10.1115/DETC2018-85225
View Paper titled, L-System-Generated Topology Optimization of Compliant Mechanisms Using Graph-Based Interpretation
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Topics: Compliant mechanisms, Optimization, Topology, Design, Density, Genetic algorithms
Proceedings Papers

Analysis and Design of an Active Self-Folding Antenna

Edwin A. Peraza Hernandez, Darren J. Hartl, Dimitris C. Lagoudas
Proc. ASME. IDETC-CIE2017, Volume 5B: 41st Mechanisms and Robotics Conference, V05BT08A049, August 6–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: DETC2017-67855
https://doi.org/10.1115/DETC2017-67855
View Paper titled, Analysis and Design of an Active Self-Folding Antenna
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Topics: Design, Shapes, Active materials, Shape memory alloys, Structural analysis
Proceedings Papers

Graphical Material Selection Methods for Multi-Constraint, Multi-Functional Composites Pressure Vessels

Jeffery W. Baur, Darren J. Hartl, Geoff J. Frank, Robyn Bradford, Gregory Huff
Proc. ASME. PVP2017, Volume 6A: Materials and Fabrication, V06AT06A058, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-65969
https://doi.org/10.1115/PVP2017-65969
View Paper titled, Graphical Material Selection Methods for Multi-Constraint, Multi-Functional Composites Pressure Vessels
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Topics: Composite materials, Pressure vessels, Liquid metals, Thermal management
Proceedings Papers

Design of Origami Structures With Smooth Folds

Edwin A. Peraza Hernandez, Darren J. Hartl, Dimitris C. Lagoudas
Proc. ASME. SMASIS2016, Volume 2: Modeling, Simulation and Control; Bio-Inspired Smart Materials and Systems; Energy Harvesting, V002T03A018, September 28–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2016-9195
https://doi.org/10.1115/SMASIS2016-9195
View Paper titled, Design of Origami Structures With Smooth Folds
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Topics: Design, Shapes, Adaptive structures, Deformation, Design methodology, Geometry, Kinematics, Manufacturing, Origami-inspired design, Testing
Journal Articles

Kinematics of Origami Structures With Smooth Folds

Edwin A. Peraza Hernandez, Darren J. Hartl, Dimitris C. Lagoudas
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. December 2016, 8(6): 061019.
Paper No: JMR-16-1115
https://doi.org/10.1115/1.4034299
Published Online: October 11, 2016
View Article titled, Kinematics of Origami Structures With Smooth Folds
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Topics: Deformation, Kinematics, Shapes, Simulation, Rotation, Modeling, Geometry
Includes: Supplementary data
Journal Articles

Design Tools for Patterned Self-Folding Reconfigurable Structures Based on Programmable Active Laminates

Edwin A. Peraza Hernandez, Darren J. Hartl, Richard J. Malak, Jr., Ergun Akleman, Ozgur Gonen, Han-Wei Kung
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. June 2016, 8(3): 031015.
Paper No: JMR-15-1176
https://doi.org/10.1115/1.4031955
Published Online: March 11, 2016
View Article titled, Design Tools for Patterned Self-Folding Reconfigurable Structures Based on Programmable Active Laminates
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Topics: Computer software, Design, Finite element analysis, Laminates, Shapes
Includes: Supplementary data
Proceedings Papers

An Experimental and Numerical Study of Shape Memory Alloy-Based Tensegrity/Origami Structures

John L. Rohmer, Edwin A. Peraza Hernandez, Robert E. Skelton, Darren J. Hartl, Dimitris C. Lagoudas
Proc. ASME. IMECE2015, Volume 9: Mechanics of Solids, Structures and Fluids, V009T12A064, November 13–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2015-51928
https://doi.org/10.1115/IMECE2015-51928
View Paper titled, An Experimental and Numerical Study of Shape Memory Alloy-Based Tensegrity/Origami Structures
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Topics: Alloys, Shapes, Tensegrity, Shape memory alloys, Cylinders, Deflection, Design, Engineering prototypes, Finite element analysis, Manufacturing
Journal Articles

Parameterized Design Optimization of a Magnetohydrodynamic Liquid Metal Active Cooling Concept

Darren J. Hartl, Edgar Galvan, Richard J. Malak, Jeffrey W. Baur
Journal: Journal of Mechanical Design
Publisher: ASME
Article Type: Research-Article
J. Mech. Des. March 2016, 138(3): 031402.
Paper No: MD-15-1479
https://doi.org/10.1115/1.4032268
Published Online: January 18, 2016
View Article titled, Parameterized Design Optimization of a Magnetohydrodynamic Liquid Metal Active Cooling Concept
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Topics: Design, Magnetohydrodynamics, Optimization, Cooling, Algebra
Proceedings Papers

Analysis and Optimization of a Shape Memory Alloy-Based Self-Folding Sheet Considering Material Uncertainties

Edwin A. Peraza Hernandez, Darren J. Hartl, Richard J. Malak, Jr., Dimitris C. Lagoudas
Proc. ASME. SMASIS2015, Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems, V001T01A013, September 21–23, 2015
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2015-9001
https://doi.org/10.1115/SMASIS2015-9001
View Paper titled, Analysis and Optimization of a Shape Memory Alloy-Based Self-Folding Sheet Considering Material Uncertainties
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Topics: Alloys, Optimization, Shapes, Uncertainty, Wire, Design, Elastomers, Materials properties, Adaptive structures, Degrees of freedom
Proceedings Papers

Characterization and Modeling of Thermo-Mechanical Fatigue in Equiatomic NiTi Actuators

Robert W. Wheeler, Darren J. Hartl, Yves Chemisky, Dimitris C. Lagoudas
Proc. ASME. SMASIS2014, Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bioinspired Smart Materials and Systems; Energy Harvesting, V002T02A009, September 8–10, 2014
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2014-7591
https://doi.org/10.1115/SMASIS2014-7591
View Paper titled, Characterization and Modeling of Thermo-Mechanical Fatigue in Equiatomic NiTi Actuators
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Topics: Actuators, Fatigue, Modeling, Nickel titanium alloys, Thermomechanics, Heat, Stress, Damage, Temperature, Aerospace industry
Proceedings Papers

Development and Characterization of Embedded Sensory Particles Using Multi-Scale 3D Digital Image Correlation

Stephen R. Cornell, William P. Leser, Jacob D. Hochhalter, John A. Newman, Darren J. Hartl
Proc. ASME. SMASIS2014, Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bioinspired Smart Materials and Systems; Energy Harvesting, V002T02A010, September 8–10, 2014
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2014-7608
https://doi.org/10.1115/SMASIS2014-7608
View Paper titled, Development and Characterization of Embedded Sensory Particles Using Multi-Scale 3D Digital Image Correlation
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Topics: Particulate matter, Fatigue cracks, Phase transitions, Fracture (Materials), Acoustics, Aluminum alloys, Deformation, Density, NASA, Nickel titanium alloys
Proceedings Papers

Design and Optimization of an SMA-Based Self-Folding Structural Sheet With Sparse Insulating Layers

Edwin A. Peraza Hernandez, Darren J. Hartl, Andreas Kotz, Richard J. Malak, Jr
Proc. ASME. SMASIS2014, Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring; Keynote Presentation, V001T01A015, September 8–10, 2014
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2014-7540
https://doi.org/10.1115/SMASIS2014-7540
View Paper titled, Design and Optimization of an SMA-Based Self-Folding Structural Sheet With Sparse Insulating Layers
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Topics: Design, Optimization, Finite element analysis, Heat transfer, Origami-inspired design, Robotics, Shape memory alloys, Storage, Wire, Wire mesh
Proceedings Papers

Experimental Analysis of Self-Folding SMA-Based Sheet Design for Simulation Validation

Aaron C. Powledge, Darren J. Hartl, Richard J. Malak
Proc. ASME. SMASIS2014, Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring; Keynote Presentation, V001T01A016, September 8–10, 2014
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2014-7546
https://doi.org/10.1115/SMASIS2014-7546
View Paper titled, Experimental Analysis of Self-Folding SMA-Based Sheet Design for Simulation Validation
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Topics: Design, Experimental analysis, Simulation, Finite element analysis, Deformation, Temperature, Engineering design, Heating, Laminates, Origami-inspired design
Proceedings Papers

Development of a SMA-Based, Slat-Cove Filler for Reduction of Aeroacoustic Noise Associated With Transport-Class Aircraft Wings

Travis L. Turner, Reggie T. Kidd, Darren J. Hartl, William D. Scholten
Proc. ASME. SMASIS2013, Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting, V002T02A005, September 16–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2013-3100
https://doi.org/10.1115/SMASIS2013-3100
View Paper titled, Development of a SMA-Based, Slat-Cove Filler for Reduction of Aeroacoustic Noise Associated With Transport-Class Aircraft Wings
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Topics: Aircraft, Fillers (Materials), Noise (Sound), Wings, Design, Aerodynamic flow, Cavities, Displacement, Flight, Stress
Proceedings Papers

Experimental Validation of a Shape Memory Alloy Constitutive Model by Heterogeneous Thermal Loading Using Infrared Thermography and Digital Image Correlation

Stephen R. Cornell, Darren J. Hartl, Dimitris C. Lagoudas
Proc. ASME. SMASIS2013, Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting, V002T02A009, September 16–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2013-3143
https://doi.org/10.1115/SMASIS2013-3143
View Paper titled, Experimental Validation of a Shape Memory Alloy Constitutive Model by Heterogeneous Thermal Loading Using Infrared Thermography and Digital Image Correlation
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Topics: Constitutive equations, Shape memory alloys, Thermography, Heating, Calibration, Heating and cooling, Deformation, Nickel titanium alloys
Proceedings Papers

A Study of Actuation Fatigue of Shape Memory Alloy

Babatunde O. Agboola, Darren J. Hartl, Dimitris C. Lagoudas
Proc. ASME. SMASIS2012, Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bio-Inspired Materials and Systems; Energy Harvesting, 287-293, September 19–21, 2012
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2012-8222
https://doi.org/10.1115/SMASIS2012-8222
View Paper titled, A Study of Actuation Fatigue of Shape Memory Alloy
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Topics: Fatigue, Shape memory alloys, Failure, Cycles, Actuators, Design, Fatigue life, Nickel, Stress, Temperature
Proceedings Papers

Coexistense of Creep and Transformation in High Temperature Shape Memory Alloys

Dimitris C. Lagoudas, George Chatzigeorgiou, Darren J. Hartl, Parikshith K. Kumar
Proc. ASME. IMECE2009, Volume 12: Micro and Nano Systems, Parts A and B, 45-51, November 13–19, 2009
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2009-11718
https://doi.org/10.1115/IMECE2009-11718
View Paper titled, Coexistense of Creep and Transformation in High Temperature Shape Memory Alloys
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Topics: Creep, High temperature, Shape memory alloys, Phase transitions, Actuators, Calibration, Constitutive equations, Metals, Viscoplasticity