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Proceedings Papers

Thermal Conductivity of Advanced 3D Printed Polymers

Cory Jacques, Todd Letcher, Gregory J. Michna
Proc. ASME. HT2024, ASME 2024 Heat Transfer Summer Conference, V001T02A004, July 15–17, 2024
Publisher: American Society of Mechanical Engineers
Paper No: HT2024-130686
https://doi.org/10.1115/HT2024-130686
View Paper titled, Thermal Conductivity of Advanced 3D Printed Polymers
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Topics: Additive manufacturing, Polymers, Thermal conductivity
Proceedings Papers

Nanomechanical Characterization of Additive Manufactured GRCop-42 Alloy Developed by Directed Energy Deposition Methods

Trupti Suresh, Scott Landes, Todd Letcher, Anamika Prasad, Paul Gradl, David Ellis
Proc. ASME. IMECE2020, Volume 4: Advances in Aerospace Technology, V004T04A003, November 16–19, 2020
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2020-23382
https://doi.org/10.1115/IMECE2020-23382
View Paper titled, Nanomechanical Characterization of Additive Manufactured GRCop-42 Alloy Developed by Directed Energy Deposition Methods
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Topics: Additive manufacturing, Alloys, Lasers
Proceedings Papers

Investigation of Additive Manufactured GRCop-42 Alloy Developed by Directed Energy Deposition Methods

Scott Landes, Trupti Suresh, Anamika Prasad, Todd Letcher, Paul Gradl, David Ellis
Proc. ASME. IMECE2020, Volume 4: Advances in Aerospace Technology, V004T04A026, November 16–19, 2020
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2020-24400
https://doi.org/10.1115/IMECE2020-24400
View Paper titled, Investigation of Additive Manufactured GRCop-42 Alloy Developed by Directed Energy Deposition Methods
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Topics: Additive manufacturing, Alloys
Proceedings Papers

The Effects of 3D Printing Parameters and Surface Roughness on Convective Heat Transfer Performance

Lucas Pereira, Todd Letcher, Gregory J. Michna
Proc. ASME. HT2019, ASME 2019 Heat Transfer Summer Conference, V001T13A011, July 14–17, 2019
Publisher: American Society of Mechanical Engineers
Paper No: HT2019-3591
https://doi.org/10.1115/HT2019-3591
View Paper titled, The Effects of 3D Printing Parameters and Surface Roughness on Convective Heat Transfer Performance
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Topics: Additive manufacturing, Convection, Surface roughness, Heat transfer coefficients, Reynolds number, Extruding, Heat exchangers, Heat sinks, Manufacturing, Polymers
Journal Articles

Effects of Gamma Irradiation Upon the Mechanical and Chemical Properties of 3D-Printed Samples of Polylactic Acid

Conrad West, Robert McTaggart, Todd Letcher, Douglas Raynie, Ranen Roy
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. April 2019, 141(4): 041002.
Paper No: MANU-18-1696
https://doi.org/10.1115/1.4042581
Published Online: February 27, 2019
View Articletitled, Effects of Gamma Irradiation Upon the Mechanical and Chemical Properties of 3D-Printed Samples of Polylactic Acid
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Topics: Additive manufacturing, Irradiation (Radiation exposure), Radiation (Physics), Temperature, Testing, Fourier transform infrared spectroscopy, Tensile strength, Gamma rays, Degrees of freedom
Journal Articles

In-Plane Stiffness of Additively Manufactured Hierarchical Honeycomb Metamaterials With Defects

Kazi Moshiur Rahman, Zhong Hu, Todd Letcher
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. January 2018, 140(1): 011007.
Paper No: MANU-16-1616
https://doi.org/10.1115/1.4038205
Published Online: November 16, 2017
View Articletitled, In-Plane Stiffness of Additively Manufactured Hierarchical Honeycomb Metamaterials With Defects
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Topics: Additive manufacturing, Honeycomb structures, Stiffness, Elastic moduli
Proceedings Papers

Thermal Conductivity Testing Apparatus for 3D Printed Materials

Tiffaney Flaata, Gregory J. Michna, Todd Letcher
Proc. ASME. HT2017, Volume 2: Heat Transfer Equipment; Heat Transfer in Multiphase Systems; Heat Transfer Under Extreme Conditions; Nanoscale Transport Phenomena; Theory and Fundamental Research in Heat Transfer; Thermophysical Properties; Transport Phenomena in Materials Processing and Manufacturing, V002T15A006, July 9–12, 2017
Publisher: American Society of Mechanical Engineers
Paper No: HT2017-4856
https://doi.org/10.1115/HT2017-4856
View Paper titled, Thermal Conductivity Testing Apparatus for 3D Printed Materials
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Topics: Additive manufacturing, Testing, Thermal conductivity, Polymer composites, Heat exchangers, Heat transfer, Metals, Polymers, Brass (Metal), Bronze
Proceedings Papers

An Experimental Investigation of the Effects of Gamma Radiation on 3D Printed ABS for In-Space Manufacturing Purposes

Behzad Rankouhi, Fereidoon Delfanian, Robert McTaggart, Todd Letcher
Proc. ASME. IMECE2016, Volume 1: Advances in Aerospace Technology, V001T03A042, November 11–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2016-67745
https://doi.org/10.1115/IMECE2016-67745
View Paper titled, An Experimental Investigation of the Effects of Gamma Radiation on 3D Printed ABS for In-Space Manufacturing Purposes
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Topics: Additive manufacturing, Gamma rays, Manufacturing, Equipment performance, Mechanical properties, Testing, Cobalt, Extraterrestrial radiation, Feedstock, Irradiation (Radiation exposure)
Proceedings Papers

Effects of Defects on the Performance of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing

Kazi Moshiur Rahman, Todd Letcher, Zhong Hu
Proc. ASME. IMECE2016, Volume 2: Advanced Manufacturing, V002T02A028, November 11–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2016-66940
https://doi.org/10.1115/IMECE2016-66940
View Paper titled, Effects of Defects on the Performance of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing
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Topics: Additive manufacturing, Honeycomb structures, Metamaterials, Manufacturing, Weight (Mass), Density, Elastic moduli, Elasticity, Engineering simulation, Engineering systems and industry applications
Proceedings Papers

Mechanical Properties of Additively Manufactured PEEK Components Using Fused Filament Fabrication

Kazi Moshiur Rahman, Todd Letcher, Riley Reese
Proc. ASME. IMECE2015, Volume 2A: Advanced Manufacturing, V02AT02A009, November 13–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2015-52209
https://doi.org/10.1115/IMECE2015-52209
View Paper titled, Mechanical Properties of Additively Manufactured PEEK Components Using Fused Filament Fabrication
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Topics: Additive manufacturing, Manufacturing, Mechanical properties, Compression, Impact testing, Tensile strength, Testing, Absorption, Contamination, Elastic moduli
Proceedings Papers

Experimental Study of Mechanical Properties of Additively Manufactured ABS Plastic as a Function of Layer Parameters

Todd Letcher, Behzad Rankouhi, Sina Javadpour
Proc. ASME. IMECE2015, Volume 2A: Advanced Manufacturing, V02AT02A018, November 13–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2015-52634
https://doi.org/10.1115/IMECE2015-52634
View Paper titled, Experimental Study of Mechanical Properties of Additively Manufactured ABS Plastic as a Function of Layer Parameters
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Topics: Additive manufacturing, Mechanical properties, Elastic moduli, Stress, Manufacturing, Computer software, Elongation, Engineers, Machinery, Materials properties
Proceedings Papers

Material Property Testing of 3D-Printed Specimen in PLA on an Entry-Level 3D Printer

Todd Letcher, Megan Waytashek
Proc. ASME. IMECE2014, Volume 2A: Advanced Manufacturing, V02AT02A014, November 14–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2014-39379
https://doi.org/10.1115/IMECE2014-39379
View Paper titled, Material Property Testing of 3D-Printed Specimen in PLA on an Entry-Level 3D Printer
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Topics: Additive manufacturing, Materials properties, Testing, Fatigue testing, Bending (Stress), Creep, Damage, Fatigue, Mechanical properties, Recycling
Proceedings Papers

Hysteresis Strain Energy Behavior of Al6061-T6 With Multi-Fatigue Load Levels as Applied to an Energy-Based Fatigue Life Prediction Method

Todd Letcher, Sepehr Nesaei, Cody Auen, Matt Nielsen, Fereidoon Delfanian
Proc. ASME. IMECE2013, Volume 9: Mechanics of Solids, Structures and Fluids, V009T10A101, November 15–21, 2013
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2013-64684
https://doi.org/10.1115/IMECE2013-64684
View Paper titled, Hysteresis Strain Energy Behavior of Al6061-T6 With Multi-Fatigue Load Levels as Applied to an Energy-Based Fatigue Life Prediction Method
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Topics: Fatigue, Fatigue life, Stress, Testing, Design, Fatigue testing
Proceedings Papers

Applying an Energy-Based Fatigue Life Prediction Method to Unnotched and Notched Al6061-T6 Specimen

Sepehr Nesaei, Todd Letcher, Fereidoon Delfanian
Proc. ASME. IMECE2013, Volume 9: Mechanics of Solids, Structures and Fluids, V009T10A100, November 15–21, 2013
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2013-64485
https://doi.org/10.1115/IMECE2013-64485
View Paper titled, Applying an Energy-Based Fatigue Life Prediction Method to Unnotched and Notched Al6061-T6 Specimen
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Topics: Fatigue life, Fatigue, Fracture mechanics, Fracture (Materials), Stress, Buckling, Low cycle fatigue, Prediction theory
Journal Articles

Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6

Todd Letcher, M.-H. H. Shen, Onome Scott-Emuakpor, Tommy George, Charles Cross
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2014, 136(2): 022502.
Paper No: GTP-13-1150
https://doi.org/10.1115/1.4025497
Published Online: November 1, 2013
View Articletitled, Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6
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Topics: Fatigue, Fatigue life, Stress, Testing, Cycles
Journal Articles

A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method

Todd Letcher, John Wertz, M.-H. Herman Shen
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2013, 135(12): 122502.
Paper No: GTP-13-1151
https://doi.org/10.1115/1.4025315
Published Online: September 20, 2013
View Articletitled, A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method
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Topics: Fatigue, Fatigue life, Optimization, Stress, Fracture (Materials), Fracture (Process)
Proceedings Papers

A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method

Todd Letcher, John Wertz, M.-H. Herman Shen
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 215-223, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68905
https://doi.org/10.1115/GT2012-68905
View Paper titled, A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method
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Topics: Fatigue life, Optimization, Accounting, Fracture (Materials), Fracture (Process), Stress, Density, Design, Fatigue, Probability
Proceedings Papers

Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6

Todd Letcher, M.-H. Herman Shen, Onome Scott-Emuakpor, Tommy George, Charles Cross
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 225-233, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68911
https://doi.org/10.1115/GT2012-68911
View Paper titled, Strain Rate and Loading Waveform Effects on an Energy-Based Fatigue Life Prediction for AL6061-T6
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Topics: Fatigue life, Waves, Cycles, Fatigue, Stress, Tension, Testing
Proceedings Papers

Damage Parameter Assessment for Energy Based Fatigue Life Prediction Methods

Casey M. Holycross, John N. Wertz, Todd Letcher, M.-H. Herman Shen, Onome E. Scott-Emuakpor, Tommy J. George
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 235-240, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68919
https://doi.org/10.1115/GT2012-68919
View Paper titled, Damage Parameter Assessment for Energy Based Fatigue Life Prediction Methods
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Topics: Damage, Fatigue life, Fracture (Materials), Fracture (Process), Energy dissipation, Brittle fracture, Failure data, Failure mechanisms, Fatigue, Low cycle fatigue
Proceedings Papers

An Energy-Based Axial Isothermal-Mechanical Fatigue Lifing Method

John Wertz, Todd Letcher, M.-H. Herman Shen, Onome Scott-Emuakpor, Tommy George, Charles Cross
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 207-214, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68889
https://doi.org/10.1115/GT2012-68889
View Paper titled, An Energy-Based Axial Isothermal-Mechanical Fatigue Lifing Method
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Topics: Fatigue, Temperature, Testing, Materials properties, Operating temperature