Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0097
Faith Gantz, Michael T Wall, M. L. Young, D. Forbes
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.
{"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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0030
Parham Kabirifar, Jonas Trojer, M. Brojan, J. Tušek
Shape memory alloys such as NiTi can be used as recyclable, nontoxic, nonflammable, and environmentally friendly solid refrigerants in elastocaloric cooling/heat-pumping. Thin wires under tension and thin- walled tubes under compression that allow for fast and efficient heat transfer are excellent candidates to be applied in elastocaloric devices and were therefore selected for this study. Multiple thermodynamic cycles were studied with an emphasis on the parameters of the holding period of the cycle (essential for heat transfer between the elastocaloric material and the heat sink/source). The results reveal that the applied thermodynamic cycle significantly affects the thermomechanical response and thus the cooling/heating efficiency of the shape memory material.
{"title":"Improving Elastocaloric Cooling Performance by Applying Novel Thermodynamic Cycle","authors":"Parham Kabirifar, Jonas Trojer, M. Brojan, J. Tušek","doi":"10.31399/asm.cp.smst2022p0030","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0030","url":null,"abstract":"\u0000 Shape memory alloys such as NiTi can be used as recyclable, nontoxic, nonflammable, and environmentally friendly solid refrigerants in elastocaloric cooling/heat-pumping. Thin wires under tension and thin- walled tubes under compression that allow for fast and efficient heat transfer are excellent candidates to be applied in elastocaloric devices and were therefore selected for this study. Multiple thermodynamic cycles were studied with an emphasis on the parameters of the holding period of the cycle (essential for heat transfer between the elastocaloric material and the heat sink/source). The results reveal that the applied thermodynamic cycle significantly affects the thermomechanical response and thus the cooling/heating efficiency of the shape memory material.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"16 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":"128218412","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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0014
Jacob Mingear, Brady K. Allen, Jessica J. Zamarripa, D. Hartl
Shape memory alloys are capable of producing some of the highest actuation stresses (~300 MPa) of any active material. However, large monolithic SMA actuators, which can induce the tremendous forces required in some applications, are currently limited to low cyclic actuation frequencies due to their associated high thermal masses coupled with innate low thermal diffusivities of the material. An increase in the effective thermal diffusivity of an SMA actuator system will result in an increase in actuation frequency; accordingly, this would lead to the ability to perform more cycles over a given time interval and subsequently yield an overall higher actuator power density (energy density with time). This current work presents ongoing research in the design, manufacturing, enabling surface engineering (such as chemical etching and anodization), and testing of internal channel additively manufactured SMA actuator designs, including a tensile bar variation and planned testing of an optimized cantilever beam.
{"title":"Internal Liquid Metal Channels to Enable High Power Additively Manufactured SMA Actuators","authors":"Jacob Mingear, Brady K. Allen, Jessica J. Zamarripa, D. Hartl","doi":"10.31399/asm.cp.smst2022p0014","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0014","url":null,"abstract":"\u0000 Shape memory alloys are capable of producing some of the highest actuation stresses (~300 MPa) of any active material. However, large monolithic SMA actuators, which can induce the tremendous forces required in some applications, are currently limited to low cyclic actuation frequencies due to their associated high thermal masses coupled with innate low thermal diffusivities of the material. An increase in the effective thermal diffusivity of an SMA actuator system will result in an increase in actuation frequency; accordingly, this would lead to the ability to perform more cycles over a given time interval and subsequently yield an overall higher actuator power density (energy density with time). This current work presents ongoing research in the design, manufacturing, enabling surface engineering (such as chemical etching and anodization), and testing of internal channel additively manufactured SMA actuator designs, including a tensile bar variation and planned testing of an optimized cantilever beam.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"3 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":"127760953","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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0085
E. Marchenko, G. Baigonakova, S. Gunther, O. Mamazakirov
TiNi-based wire is widely used in the manufacture of surgical implants and designs due to its biocompatibility and ability to undergo viscoelastic deformation with tissues, withstanding millions of deformation cycles without destruction. TiNi is a self-passivating material, as it forms a complex surface oxide layer that protects the material from corrosion and is itself biocompatible. The functional properties of TiNi wire are determined by the structure, composition, and thickness. The purpose of this work is to study the deformation behavior of thin TiNi wires depending on the thickness. TiNi wires of different thicknesses (40, 60, 90 µm) were tested by uniaxial tension to rupture and in the load-unload cycle (5 cycles). The results found that All TiNi wires exhibit the effect of superelasticity at a relative strain of 5-7%. With an increase in the wire thickness from 40 to 90 µm, the values of the martensitic shear stress increase from 450 to 1200 MPa and the tensile strength increases from 1300 to 3150 MPa.
{"title":"Features of Deformation of Thin Superelastic TiNi Wire","authors":"E. Marchenko, G. Baigonakova, S. Gunther, O. Mamazakirov","doi":"10.31399/asm.cp.smst2022p0085","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0085","url":null,"abstract":"\u0000 TiNi-based wire is widely used in the manufacture of surgical implants and designs due to its biocompatibility and ability to undergo viscoelastic deformation with tissues, withstanding millions of deformation cycles without destruction. TiNi is a self-passivating material, as it forms a complex surface oxide layer that protects the material from corrosion and is itself biocompatible. The functional properties of TiNi wire are determined by the structure, composition, and thickness. The purpose of this work is to study the deformation behavior of thin TiNi wires depending on the thickness. TiNi wires of different thicknesses (40, 60, 90 µm) were tested by uniaxial tension to rupture and in the load-unload cycle (5 cycles). The results found that All TiNi wires exhibit the effect of superelasticity at a relative strain of 5-7%. With an increase in the wire thickness from 40 to 90 µm, the values of the martensitic shear stress increase from 450 to 1200 MPa and the tensile strength increases from 1300 to 3150 MPa.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"25 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":"133133014","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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0059
D. Nicholson, O. Benafan, G. Bigelow, F. Sczerzenie, D. Forbes, B. Van Doren, J. Mabe, A. Demblon, I. Karaman
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.
{"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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0105
J. Cerar, P. Jan, J. Klemenc, M. Kalin, J. Tušek
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.
{"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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0101
Steven E. Walak, N. Budiansky
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.
{"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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0095
Stefan Zende, Moritz Pohler, Lucas Bittigkoffer, Nils-Agne Feth
Nitinol's thermomechanical properties are well studied and understood below the so-called martensite death (MD) temperature, above which martensite cannot be induced by mechanical stress: Even at high stresses Nitinol stays in the austenite phase. This paper presents tensile tests performed well above MD (>150 °C) with Nitinol specimens laser cut from tube. The investigations show that Nitinol drastically changes its mechanical properties in this temperature range: The superelastic plateau shortens and finally vanishes. Furthermore, Nitinol starts becoming more ductile.
{"title":"Hot Forming of Nitinol: Fundamental Investigations and Applications","authors":"Stefan Zende, Moritz Pohler, Lucas Bittigkoffer, Nils-Agne Feth","doi":"10.31399/asm.cp.smst2022p0095","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0095","url":null,"abstract":"\u0000 Nitinol's thermomechanical properties are well studied and understood below the so-called martensite death (MD) temperature, above which martensite cannot be induced by mechanical stress: Even at high stresses Nitinol stays in the austenite phase. This paper presents tensile tests performed well above MD (>150 °C) with Nitinol specimens laser cut from tube. The investigations show that Nitinol drastically changes its mechanical properties in this temperature range: The superelastic plateau shortens and finally vanishes. Furthermore, Nitinol starts becoming more ductile.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"261 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":"116821624","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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0053
P. Caltagirone, O. Benafan, S. Bostic
A comprehensive shape memory materials database (SMMD) repository is being developed that provides access to a large collection of information on shape memory materials (SMMs) in a single source. The collection of point data and metadata provides insight into actuation properties, structural performance, chemical data, processing records, and similar factors pertinent to shape memory alloys, polymers, and ceramics. The data is organized in a 2D and 3D visualization platform allowing users to gain immediate access to data insights and trends with only a few button clicks. All data points have full traceability to the original source to verify findings and create a link to researchers and scientists within the community. In addition to millions of datapoints already displayed, the web-application also offers access to analysis tools, references to international standards, and resources pertinent to the SMM community.
{"title":"Shape Memory Materials Database (SMMD): Finding Data Anomalies & Trends","authors":"P. Caltagirone, O. Benafan, S. Bostic","doi":"10.31399/asm.cp.smst2022p0053","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0053","url":null,"abstract":"\u0000 A comprehensive shape memory materials database (SMMD) repository is being developed that provides access to a large collection of information on shape memory materials (SMMs) in a single source. The collection of point data and metadata provides insight into actuation properties, structural performance, chemical data, processing records, and similar factors pertinent to shape memory alloys, polymers, and ceramics. The data is organized in a 2D and 3D visualization platform allowing users to gain immediate access to data insights and trends with only a few button clicks. All data points have full traceability to the original source to verify findings and create a link to researchers and scientists within the community. In addition to millions of datapoints already displayed, the web-application also offers access to analysis tools, references to international standards, and resources pertinent to the SMM community.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"46 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":"131001868","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}
Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0057
C. Holm, Nefeli Klonis, R. Krieg, R. Theiss, P. Dültgen
In this paper, the results of different selected mechanical and electrolytic preparation methods are compared with regard to the successful visualization of Nitinol microstructure. The results indicate that a commonly specified preparation route may result in false microstructure and therefore in false interpretation of the material, its behavior, and its lifetime condition. An electrolytic preparation is defined that may provide superior metallographic sample preparation results for drawn NiTi materials.
{"title":"Comparison of Various Metallography Preparation Methods of Binary NiTi-shape Memory Alloy Specimens","authors":"C. Holm, Nefeli Klonis, R. Krieg, R. Theiss, P. Dültgen","doi":"10.31399/asm.cp.smst2022p0057","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0057","url":null,"abstract":"\u0000 In this paper, the results of different selected mechanical and electrolytic preparation methods are compared with regard to the successful visualization of Nitinol microstructure. The results indicate that a commonly specified preparation route may result in false microstructure and therefore in false interpretation of the material, its behavior, and its lifetime condition. An electrolytic preparation is defined that may provide superior metallographic sample preparation results for drawn NiTi materials.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"67 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":"125513483","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：