Characterization of Ni19.5Ti50.5Pd25Pt5 high-temperature shape memory alloy springs and their potential applications in aeronautics

Shape memory alloys (SMAs) have been used as actuators in many different industries since the discovery of the shape memory effect, but the use of SMAs as actuation devices in aeronautics has been limited due to the temperature constraints of commercially available materials. Consequently, work is being done at NASA's Glenn Research Center to develop new SMAs capable of being used in high temperature environments. One of the more promising high-temperature shape memory alloys (HTSMAs) is Ni19.5Ti50.5Pd25Pt5. Recent work has shown that this material is capable of being used in operating environments of up to 250°C. This material has been shown to have very useful actuation capabilities, demonstrating repeatable strain recoveries up to 2.5% in the presence of an externally applied load. Based on these findings, further work has been initiated to explore potential applications and alternative forms of this alloy, such as springs. Thus, characterization of Ni19.5Ti50.5Pd25Pt5 springs, including their mechanical response and how variations in this response correlate to changes in geometric parameters, are discussed. The effects of loading history, or training, on spring behavior were also investigated. A comparison of the springs with wire actuators is made and the benefits of using one actuator form as opposed to the other discussed. These findings are used to discuss design considerations for a surge-control mechanism that could be used in the centrifugal compressor of a T-700 helicopter engine.

[1]  Constantinos Mavroidis,et al.  Development of Advanced Actuators Using Shape Memory Alloys and Electrorheological Fluids , 2002, Research in Nondestructive Evaluation.

[2]  Dale M. Pitt,et al.  SAMPSON smart inlet design overview and wind tunnel test: II. Wind tunnel test , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[3]  Aaron P. Stebner.  Development, Characterization, and Application of Ni 19.5 Ti 50.5 Pd 25 Pt 5 High-Temperature Shape Memory Alloy Helical Actuators , 2007 .

[4]  Ronald D. Noebe,et al.  Effect of Thermomechanical Processing on the Microstructure, Properties, and Work Behavior of a Ti50.5 Ni29.5 Pt20 High-Temperature Shape Memory Alloy , 2006 .

[5]  Damin J. Siler,et al.  Variable stiffness mechanisms with SMA actuators , 1996, Smart Structures.

[6]  T. Read,et al.  Plastic Deformation and Diffusionless Phase Changes in Metals — the Gold-Cadmium Beta Phase , 1951 .

[7]  Dale M. Pitt,et al.  SAMPSON smart inlet design overview and wind tunnel test: I. Design overview , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8]  A. G. Crocker,et al.  Type II twinning in martensite crystallography theories , 1969 .

[9]  Michael Sholl,et al.  CHIPS: A NASA University Explorer Astronomy Mission , 2003 .

[10]  Dimitris C. Lagoudas,et al.  Characterization and 3-D modeling of Ni60Ti SMA for actuation of a variable geometry jet engine chevron , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Ronald D. Noebe,et al.  Properties and potential of two (Ni,Pt)Ti alloys for use as high-temperature actuator materials , 2005, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[12]  Bernie F. Carpenter,et al.  Shape-memory actuated gimbal , 1995, Smart Structures.

[13]  Inderjit Chopra,et al.  Design of a variable twist tilt-rotor blade using shape memory alloy (SMA) actuators , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[14]  B. Bilby,et al.  The theory of the crystallography of deformation twinning , 1965, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[15]  Orlando Rios,et al.  Properties of a Ni19.5Pd30Ti50.5 high-temperature shape memory alloy in tension and compression , 2006, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[16]  R. Cahn,et al.  Plastic deformation of alpha-uranium; twinning and slip , 1953 .

[17]  Friedrich K. Straub,et al.  Applications of torsional shape memory alloy actuators for active rotor blade control: opportunities and limitations , 1996, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[18]  Ronald D. Noebe,et al.  Correlation between mechanical behavior and actuator-type performance of Ni-Ti-Pd high-temperature shape memory alloys , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[19]  Glen Bigelow,et al.  Effects of Palladium Content, Quaternary Alloying, and Thermomechanical Processing on the Behavior of Ni-Ti-Pd Shape Memory Alloys for Actuator Applications , 2008 .

[20]  C. M. Wayman,et al.  Shape-Memory Materials , 2018 .

[21]  Steven J. Savage,et al.  ENGINEERING ASPECTS OF SHAPE MEMORY ALLOYS , 1991 .

[22]  Todd R. Quackenbush,et al.  Development of a HTSMA-Actuated Surge Control Rod for High-Temperature Turbomachinery Applications , 2007 .