SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies最新文献

Effect of Flash Annealing on the Microstructure and Fatigue Life of a Ni-rich NiTi-20 at.% Hf High Temperature Shape Memory Alloy 闪蒸退火对富镍NiTi-20合金组织和疲劳寿命的影响。高温形状记忆合金

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0097

Faith Gantz, Michael T Wall, M. L. Young, D. Forbes

{"title":"Effect of Flash Annealing on the Microstructure and Fatigue Life of a Ni-rich NiTi-20 at.% Hf High Temperature Shape Memory Alloy","authors":"Faith Gantz, Michael T Wall, M. L. Young, D. Forbes","doi":"10.31399/asm.cp.smst2022p0097","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0097","url":null,"abstract":"\u0000 Typical processing techniques involve thermo-mechanically treating the material such as cold working and subsequent annealing to control grain and precipitate size, shape, orientation, and morphology. Shape memory alloy (SMA) mechanical properties rely heavily on microstructural features such as precipitates and grain size to extend fatigue life. Novel approaches to control microstructural features have used laser anneal on amorphous NiTi thin films to recrystallize grains and short-time annealing on NiTi after angular extrusion and cold-drawn fine wires. A recent study examined rapid thermal annealing (RTA) on Ni-lean NiTi- 10 at.% Hf wires as an effective method for controlling grain size and extending actuation fatigue; however, flash annealing or RTA on Ni-rich NiTiHf high-temperature SMA (HTMSA) wires has not been investigated. Based on a larger study, Ni-rich NiTi-20 at.% Hf HTSMA was down-selected for further processing. This study investigates the effect of flash annealing on the thermo-mechanical properties of a Ni-rich Ni50.3Ti29.7Hf20 HTSMA. Microstructural changes were examined using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). Actuation fatigue properties were also evaluated at 300 MPa. The results indicate that flash annealing HTSMA wires is an effective method for controlling grain size and extending fatigue life. The heating rate and time held are crucial parameters to control microstructural features such as grain size and coherency.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125029864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving Elastocaloric Cooling Performance by Applying Novel Thermodynamic Cycle 应用新型热力循环改善弹热冷却性能

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0030

Parham Kabirifar, Jonas Trojer, M. Brojan, J. Tušek

引用次数: 0

Internal Liquid Metal Channels to Enable High Power Additively Manufactured SMA Actuators 内部液态金属通道实现高功率增材制造SMA致动器

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0014

Jacob Mingear, Brady K. Allen, Jessica J. Zamarripa, D. Hartl

引用次数: 1

Features of Deformation of Thin Superelastic TiNi Wire 超弹性TiNi细丝的变形特征

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0085

E. Marchenko, G. Baigonakova, S. Gunther, O. Mamazakirov

引用次数: 0

An Overview of ASTM Standard Test Methods for Shape Memory Alloy Actuation Materials 形状记忆合金驱动材料的ASTM标准试验方法概述

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0059

D. Nicholson, O. Benafan, G. Bigelow, F. Sczerzenie, D. Forbes, B. Van Doren, J. Mabe, A. Demblon, I. Karaman

{"title":"An Overview of ASTM Standard Test Methods for Shape Memory Alloy Actuation Materials","authors":"D. Nicholson, O. Benafan, G. Bigelow, F. Sczerzenie, D. Forbes, B. Van Doren, J. Mabe, A. Demblon, I. Karaman","doi":"10.31399/asm.cp.smst2022p0059","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0059","url":null,"abstract":"\u0000 Standard test methods for Uniaxial Constant Force Thermal Cycling (UCFTC) and Uniaxial Pre-strain and Free Recovery (UPFR) have been published under ASTM as E3097 and E3098, respectively. These two test methods capture the two most important responses in shape memory alloys (SMAs) for actuation, which is load-biased shape memory effect and classical shape memory effect. These test methods measure the transformation properties such as transformation temperatures, actuation strain, and residual strain to provide data for the characterization and selection of SMA materials, quality control, design allowables, and actuator design. In light of this recent development, additional test methods are still needed to fully support the transition of SMA actuators to production use. First, there is a recognized need for a test method that defines and evaluates the evolution of actuation properties and actuation lifecycle during repeated UCFTC. Second, rotary SMA actuation has been demonstrated as a practical and valuable actuator form as highlighted recently during flight test of the spanwise adaptive wing and reconfigurable vortex generators and in remote controlled actuated wind tunnel models. To this end, two new test methods have been proposed to ASTM that extend the applicability of E3097 to repeated UCFTC and torsional testing, respectively. This paper provides an update on the development of SMA standardized test methods for actuator applications highlighting their need and envisioned approaches.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127815487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Wear and Tribology Behavior of Superelastic Ni-Ti Tubes under Fatigue Cycling in Compression 压缩疲劳循环下超弹性Ni-Ti管的磨损与摩擦学行为

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0105

J. Cerar, P. Jan, J. Klemenc, M. Kalin, J. Tušek

{"title":"Wear and Tribology Behavior of Superelastic Ni-Ti Tubes under Fatigue Cycling in Compression","authors":"J. Cerar, P. Jan, J. Klemenc, M. Kalin, J. Tušek","doi":"10.31399/asm.cp.smst2022p0105","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0105","url":null,"abstract":"\u0000 Compressive loading of shape memory alloys (SMA) is gaining considerable attention in recent years due to the improved fatigue life compared to tensile loading. This can be beneficial in applications such as dampers, actuators, and particularly elastocaloric cooling. SMA elements, however, tend to buckle under compressive loading and their stability can be enhanced by utilizing properly designed holders, i.e., structures that support SMA elements and prevent them from buckling. On the other hand, these supporting structures are in contact with SMA elements, which can cause wear and their premature failure, intensified by the lateral expansion of material under compression. In current literature, a majority of experiments are focused on reciprocating sliding wear of tungsten carbide or variations of bearing steel balls/discs/pins/rings on NiTi plates as well as on comparison of wear performance of NiTi with other materials. The aim of this present work is to theoretically and experimentally study tribological conditions between the tube and supporting element (bushing) and to find the most compatible material to NiTi in order to minimize wear, provide adequate structural support, and finally to enhance the overall fatigue behavior.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115798009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ASTM F2129 Cyclic-Potentiodynamic Polarization Testing of Nitinol Stents Indicated for Use in the GI Tract 用于胃肠道的镍钛诺支架的循环电位动态极化测试

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0101

Steven E. Walak, N. Budiansky

{"title":"ASTM F2129 Cyclic-Potentiodynamic Polarization Testing of Nitinol Stents Indicated for Use in the GI Tract","authors":"Steven E. Walak, N. Budiansky","doi":"10.31399/asm.cp.smst2022p0101","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0101","url":null,"abstract":"\u0000 Nitinol self-expanding stents are used to treat disease in all areas of the human gastrointestinal (GI) tract. Chemistry along the GI tract changes both spatially and temporally with pH ranging from 1.2 in the stomach to 8.5 in the common bile duct. A variety of secretions add ions, digestive enzymes, and proteins to the environment along the GI tract. Establishing absolute acceptance criteria for corrosion resistance of metallic implants presents a unique challenge in this constantly changing environment. In this study, cyclic potentiodynamic polarization corrosion tests were conducted over several years at multiple labs in accordance with the requirements of ASTM F2129. Braided Nitinol wire stents with thermal oxide surface representing a range of GI tract stents with good clinical history were tested in solutions selected to simulate the target anatomy in the human gastrointestinal tract. The results suggest that acceptance criteria for devices tested in simulated vascular environments do not reflect requirements for successful devices used in the varied chemical environments of the GI tract. Breakdown voltage acceptance criterion need to consider the clinical application and in-body use environment. Inherent test variability must also be considered when demonstrating statistical equivalence to clinically successful comparator devices or fixed value specifications.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124130294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hot Forming of Nitinol: Fundamental Investigations and Applications 镍钛诺热成形:基础研究与应用

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0095

Stefan Zende, Moritz Pohler, Lucas Bittigkoffer, Nils-Agne Feth

引用次数: 0

Shape Memory Materials Database (SMMD): Finding Data Anomalies & Trends 形状记忆材料数据库(SMMD):发现数据异常和趋势

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0053

P. Caltagirone, O. Benafan, S. Bostic

引用次数: 0

Comparison of Various Metallography Preparation Methods of Binary NiTi-shape Memory Alloy Specimens 二元镍钛形状记忆合金试样不同金相制备方法的比较

SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies Pub Date : 2022-05-16 DOI: 10.31399/asm.cp.smst2022p0057

C. Holm, Nefeli Klonis, R. Krieg, R. Theiss, P. Dültgen

引用次数: 0