Mr. Glen S. Bigelow Profile

Glen S. Bigelow

Materials Engineer at NASA Glenn Research Ctr

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Author

Publications (4)

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 | 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 | 20 April 2007 Paper

Correlation between mechanical behavior and actuator-type performance of Ni-Ti-Pd high-temperature shape memory alloys

Glen Bigelow, Santo Padula, Anita Garg, Ronald Noebe

Proceedings Volume 6526, 65262B (2007) https://doi.org/10.1117/12.715252

KEYWORDS: Palladium, Titanium, Nickel, Shape memory alloys, Actuators, Temperature metrology, Particles, Scanning electron microscopy, Chemical analysis, Solid state physics

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Proceedings Article | 6 April 2006 Paper

Properties of a Ni_19.5Pd₃₀Ti_50.5 high-temperature shape memory alloy in tension and compression

Ronald Noebe, Santo Padula, Glen Bigelow, Orlando Rios, Anita Garg, Brad Lerch

Proceedings Volume 6170, 617010 (2006) https://doi.org/10.1117/12.658023

KEYWORDS: Nickel, Palladium, Shape memory alloys, Temperature metrology, Resistance, Actuators, Solids, Binary data, Particles, Scanning electron microscopy

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