Dr. Ibrahim Karaman Profile

Dr. Ibrahim Karaman

Assistant Professor at Texas A&M Univ

SPIE Involvement:

Author

Proceedings Article | 29 March 2019 Paper

Fracture toughness of martensitic NiTiHf high-temperature shape memory alloy

B. Haghgouyan, B. Young, I. Karaman, D. Lagoudas

Proceedings Volume 10968, 109680A (2019) https://doi.org/10.1117/12.2514432

KEYWORDS: Shape memory alloys, Digital image correlation, Scanning electron microscopy, Aerospace engineering, Calorimetry, Mechanics, Heat treatments

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Proceedings Article | 10 July 2018 Paper

Negative thermal expansion ALLVAR alloys for telescopes

James Monroe, Jeremy McAllister, David Content, Jay Zgarba, Xavier Huerta, Ibrahim Karaman

Proceedings Volume 10706, 107060R (2018) https://doi.org/10.1117/12.2314657

KEYWORDS: Telescopes, Temperature metrology, Space telescopes, Silicon carbide, Beryllium, Zerodur, Metals, Composites, Telescope design

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Proceedings Article | 22 March 2018 Presentation + Paper

Experimental and numerical investigation of the stable crack growth regime under pseudoelastic loading in shape memory alloys

Behrouz Haghgouyan, Sameer Jape, Ceylan Hayrettin, Theocharis Baxevanis, Ibrahim Karaman, Dimitris Lagoudas

Proceedings Volume 10596, 1059612 (2018) https://doi.org/10.1117/12.2300902

KEYWORDS: Shape memory alloys, Finite element methods, Numerical analysis, Materials science, Aerospace engineering, Mechanical engineering

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Proceedings Article | 30 March 2012 Paper

Design of shape memory alloy pipe couplers: modeling and experiments

Majid Tabesh, Kadri Atli, John Rohmer, Brian Franco, Ibrahim Karaman, James Boyd, Dimitris Lagoudas

Proceedings Volume 8343, 83430J (2012) https://doi.org/10.1117/12.915361

KEYWORDS: Shape memory alloys, Heat treatments, Temperature metrology, Finite element methods, 3D modeling, Niobium, Manufacturing, Resistance, Atrial fibrillation, Thermal modeling

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Proceedings Article | 31 March 2010 Paper

Phase transformation and creep behavior in Ti50Pd30Ni20 high temperature shape memory alloy in compression

Parikshith Kumar, Uri Desai, James Monroe, Dimitris Lagoudas, Ibrahim Karaman, Ron Noebe, Glenn Bigelow

Proceedings Volume 7644, 76440Q (2010) https://doi.org/10.1117/12.851737

KEYWORDS: Shape memory alloys, Actuators, Temperature metrology, Diffusion, Aerospace engineering, Sodium, Surface finishing, Polishing, Custom fabrication, Material characterization

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Proceedings Article | 31 March 2010 Paper

Constitutive modeling of magneto-mechanical coupling response of magnetic field-induced phase transformations in NiMnCoIn magnetic shape memory alloys

Krishnendu Haldar, Dimitris Lagoudas, Burak Basaran, Ibrahim Karaman

Proceedings Volume 7644, 764410 (2010) https://doi.org/10.1117/12.847746

KEYWORDS: Magnetism, Shape memory alloys, Temperature metrology, Thermal effects, Data modeling, Thermodynamics, Calibration, Magnetic sensors, Sensors, Ferromagnetics

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Proceedings Article | 2 April 2008 Paper

Influence of test procedures on the thermomechanical properties of a 55NiTi shape memory alloy

Santo Padula, Darrell Gaydosh, Ronald Noebe, Glen Bigelow, Anita Garg, Dimitris Lagoudas, Ibrahim Karaman, Kadri Atli

Proceedings Volume 6929, 692912 (2008) https://doi.org/10.1117/12.776416

KEYWORDS: Shape memory alloys, Standards development, Actuators, Temperature metrology, Atrial fibrillation, Data modeling, Binary data, Solid state physics, Thermal modeling, Systems modeling

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Over the past few decades, binary NiTi shape memory alloys have received attention due to their unique mechanical characteristics, leading to their potential use in low-temperature, solid-state actuator applications. However, prior to using these materials for such applications, the physical response of these systems to mechanical and thermal stimuli must be thoroughly understood and modeled to aid designers in developing SMA-enabled systems. Even though shape memory alloys have been around for almost five decades, very little effort has been made to standardize testing procedures. Although some standards for measuring the transformation temperatures of SMA's are available, no real standards exist for determining the various mechanical and thermomechanical properties that govern the usefulness of these unique materials. Consequently, this study involved testing a 55NiTi alloy using a variety of different test methodologies. All samples tested were taken from the same heat and batch to remove the influence of sample pedigree on the observed results. When the material was tested under constant-stress, thermal-cycle conditions, variations in the characteristic material responses were observed, depending on test methodology. The transformation strain and irreversible strain were impacted more than the transformation temperatures, which only showed an affect with regard to applied external stress. In some cases, test methodology altered the transformation strain by 0.005-0.01mm/mm, which translates into a difference in work output capability of approximately 2 J/cm³ (290 in•lbf/in³). These results indicate the need for the development of testing standards so that meaningful data can be generated and successfully incorporated into viable models and hardware. The use of consistent testing procedures is also important when comparing results from one research organization to another. To this end, differences in the observed responses will be presented, contrasted and rationalized, in hopes of eventually developing standardized testing procedures for shape memory alloys.

Proceedings Article | 2 April 2008 Paper

Low-cycle superelastic response of a titanium-niobium shape memory alloy

Ji Ma, Ibrahim Karaman, Hans Maier

Proceedings Volume 6929, 692914 (2008) https://doi.org/10.1117/12.776577

KEYWORDS: Shape memory alloys, Heat treatments, Transmission electron microscopy, Diffraction, Nickel, Ions, Niobium, Mechanical engineering, Materials science, Surgery

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Showing 5 of 8 publications

Conference Committee Involvement (9)

Behavior and Mechanics of Multifunctional Materials and Composites VII

10 March 2013 | San Diego, California, United States

Behavior and Mechanics of Multifunctional Materials and Composites VI

12 March 2012 | San Diego, California, United States

Behavior and Mechanics of Multifunctional Materials and Composites V

7 March 2011 | San Diego, California, United States

Behavior and Mechanics of Multifunctional Materials and Composites IV

8 March 2010 | San Diego, California, United States

Behavior and Mechanics of Multifunctional Materials and Composites III

9 March 2009 | San Diego, California, United States

Showing 5 of 9 Conference Committees

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