Pub Date : 2022-05-16DOI: 10.31399/asm.cp.smst2022p0011
Sabrina M. Curtis, Duygu Dengiz, L. Bumke, E. Quandt
Auxetic shape memory alloy (SMA) materials are candidates for ballistics, deployable antennas, actuators, stretchable electronics, and biomedical devices. Auxetic materials are periodic structures characterized by a negative Poisson's ratio, meaning they expand laterally when stretched longitudinally. The work presented here shows the mechanical properties of auxetic structures are significantly improved by using sputtered superelastic shape memory alloy materials compared to traditional materials (e.g., Cu, Si). In particular, sputtered freestanding TiNiCuCo SMAs offer advantages as substrates for stretchable electronics. Two novel auxetic structures with enhanced expandability and compressibility are presented, fabricated from sputtered TiNiCuCo. The novel geometries presented in this work are based on the combination of the auxetic rotating rectangle structure where the rotating hinges are replaced by two common stretchable interconnects (e.g., serpentines and Archimedean spirals). The influence of functional fatigue on the electrical properties, thermal-induced and stress-induced phase transformations of the novel stretchable auxetic TiNiCuCo thin-films are presented.
{"title":"Auxetic Superelastic TiNiCuCo Sputtered Thin-Films For Stretchable Electronics","authors":"Sabrina M. Curtis, Duygu Dengiz, L. Bumke, E. Quandt","doi":"10.31399/asm.cp.smst2022p0011","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0011","url":null,"abstract":"\u0000 Auxetic shape memory alloy (SMA) materials are candidates for ballistics, deployable antennas, actuators, stretchable electronics, and biomedical devices. Auxetic materials are periodic structures characterized by a negative Poisson's ratio, meaning they expand laterally when stretched longitudinally. The work presented here shows the mechanical properties of auxetic structures are significantly improved by using sputtered superelastic shape memory alloy materials compared to traditional materials (e.g., Cu, Si). In particular, sputtered freestanding TiNiCuCo SMAs offer advantages as substrates for stretchable electronics. Two novel auxetic structures with enhanced expandability and compressibility are presented, fabricated from sputtered TiNiCuCo. The novel geometries presented in this work are based on the combination of the auxetic rotating rectangle structure where the rotating hinges are replaced by two common stretchable interconnects (e.g., serpentines and Archimedean spirals). The influence of functional fatigue on the electrical properties, thermal-induced and stress-induced phase transformations of the novel stretchable auxetic TiNiCuCo thin-films are presented.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"5 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":"117109755","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.smst2022p0083
Xueshi Li, Q. Sun
Elastocaloric cooling has emerged as a promising alternative to traditional vapor-compression refrigeration. Attempts to develop elastocaloric devices have been made in recent years, with substantial achievements in realizing large temperature span and high coefficient of performance (COP). Moreover, miniaturization of these devices will be highly beneficial in commercializing the elastocaloric cooling. In this work, the authors report a bending approach to induce the phase transformation of NiTi sheet with advantages of low force actuation and high temperature change, while performances of elastocaloric air cooler based on the bending mode are demonstrated and analyzed.
{"title":"An Elastocaloric Air Cooler with Low-Force Bending Actuation","authors":"Xueshi Li, Q. Sun","doi":"10.31399/asm.cp.smst2022p0083","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0083","url":null,"abstract":"\u0000 Elastocaloric cooling has emerged as a promising alternative to traditional vapor-compression refrigeration. Attempts to develop elastocaloric devices have been made in recent years, with substantial achievements in realizing large temperature span and high coefficient of performance (COP). Moreover, miniaturization of these devices will be highly beneficial in commercializing the elastocaloric cooling. In this work, the authors report a bending approach to induce the phase transformation of NiTi sheet with advantages of low force actuation and high temperature change, while performances of elastocaloric air cooler based on the bending mode are demonstrated and analyzed.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"47 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":"122014159","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.smst2022p0001
Sabrina M. Curtis, Duygu Dengiz, P. Velvaluri, L. Bumke, E. Quandt, M. Sielenkämper, S. Wulfinghoff, Gowtham Arivanandhan, Zixiong Li, M. Kohl
The thermal induced martensitic phase transition in TiNiHf was exploited for bi-directional actuation with TiNiHf/SiO2/Si composites. When compared to free-standing films of similar thickness, films on a substrate exhibit a reduced fatigue effect upon thermal cycling and a smaller hysteresis width. Differential scanning calorimetry (DSC) and cantilever deflection measurements (CDM) results showed that the transition temperatures of fabricated TiNiHf films and TiNiHf/SiO2/Si bimorph composites decrease with thermal cycling. The change in transition temperatures after 40 thermal cycles is significantly reduced for TiNiHf films bound to a SiO2/Si substrate compared to the functional fatigue DSC results reported for freestanding films. The thermal hysteresis width is also reduced for TiNiHf films constrained by SiO2/Si and Si substrates compared to freestanding films of similar thicknesses. With proper composition selection and microstructural control, TiNiHf films can be promising SMA films for bistable actuators with PMMA/TiNiHf/Si composites.
{"title":"Bistable Actuators Based on Shape Memory Alloy/ Polymer Composites","authors":"Sabrina M. Curtis, Duygu Dengiz, P. Velvaluri, L. Bumke, E. Quandt, M. Sielenkämper, S. Wulfinghoff, Gowtham Arivanandhan, Zixiong Li, M. Kohl","doi":"10.31399/asm.cp.smst2022p0001","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0001","url":null,"abstract":"The thermal induced martensitic phase transition in TiNiHf was exploited for bi-directional actuation with TiNiHf/SiO2/Si composites. When compared to free-standing films of similar thickness, films on a substrate exhibit a reduced fatigue effect upon thermal cycling and a smaller hysteresis width. Differential scanning calorimetry (DSC) and cantilever deflection measurements (CDM) results showed that the transition temperatures of fabricated TiNiHf films and TiNiHf/SiO2/Si bimorph composites decrease with thermal cycling. The change in transition temperatures after 40 thermal cycles is significantly reduced for TiNiHf films bound to a SiO2/Si substrate compared to the functional fatigue DSC results reported for freestanding films. The thermal hysteresis width is also reduced for TiNiHf films constrained by SiO2/Si and Si substrates compared to freestanding films of similar thicknesses. With proper composition selection and microstructural control, TiNiHf films can be promising SMA films for bistable actuators with PMMA/TiNiHf/Si composites.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"10 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":"124991997","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.smst2022fm01
Listing of the 2018–2022 Board of Directors for the International Organization on Shape Memory and Superelastic Technologies (SMST).
国际形状记忆和超弹性技术组织(SMST) 2018-2022年董事会名单。
{"title":"SMST 2018–2022 Board of Directors","authors":"","doi":"10.31399/asm.cp.smst2022fm01","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022fm01","url":null,"abstract":"\u0000 Listing of the 2018–2022 Board of Directors for the International Organization on Shape Memory and Superelastic Technologies (SMST).","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"8 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":"126603041","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.smst2022p0079
E. Topolnitskiy, T. Chekalkin, E. Marchenko, Y. Yasenchuk, J. Kang, L. Yahia
Radical surgical intervention for chest wall tumors is typically accompanied by the lesion of osteochondral structures and the appearance of complex post-resection defects, which result in functional and aesthetic impairment. After extensive resection of the chest wall, it is vitally important that it be simultaneously repaired, including restoring the osteochondral framework and the integrity of the integumentary tissues as well as maintaining the anatomical and physiological volume of the mediastinum and the pleural cavities. Porous and solid Nitinol implants and their successful deployment in surgical treatments have encouraged insights for immediate and delayed osteoplasty in cancer patients. The novel aspect of this work consists in this surgical method of post-excision defect repair is performed using a proprietary approach and customized NiTi-based implants. The results indicate that the suggested surgical approach and tactics using one-step repair are one of the promising techniques even though the case is aggravated with extensive chest wall lesions. The approach can be performed safely and can be recommended as a routine procedure with a high success rate. Combined Nitinol implants seem to be very good reinforcing biomaterials that enabled the reliable repair of thoracic post-excisional defects of various sizes with good functional, clinical, and cosmetic outcomes.
{"title":"Combination of Solid and Porous Nitinol Implants in Surgical Treatment of Extensive Post-Excision Thoracic Defects in Cancer Patients","authors":"E. Topolnitskiy, T. Chekalkin, E. Marchenko, Y. Yasenchuk, J. Kang, L. Yahia","doi":"10.31399/asm.cp.smst2022p0079","DOIUrl":"https://doi.org/10.31399/asm.cp.smst2022p0079","url":null,"abstract":"\u0000 Radical surgical intervention for chest wall tumors is typically accompanied by the lesion of osteochondral structures and the appearance of complex post-resection defects, which result in functional and aesthetic impairment. After extensive resection of the chest wall, it is vitally important that it be simultaneously repaired, including restoring the osteochondral framework and the integrity of the integumentary tissues as well as maintaining the anatomical and physiological volume of the mediastinum and the pleural cavities. Porous and solid Nitinol implants and their successful deployment in surgical treatments have encouraged insights for immediate and delayed osteoplasty in cancer patients. The novel aspect of this work consists in this surgical method of post-excision defect repair is performed using a proprietary approach and customized NiTi-based implants. The results indicate that the suggested surgical approach and tactics using one-step repair are one of the promising techniques even though the case is aggravated with extensive chest wall lesions. The approach can be performed safely and can be recommended as a routine procedure with a high success rate. Combined Nitinol implants seem to be very good reinforcing biomaterials that enabled the reliable repair of thoracic post-excisional defects of various sizes with good functional, clinical, and cosmetic outcomes.","PeriodicalId":119283,"journal":{"name":"SMST 2022: Extended Abstracts from the International Conference on Shape Memory and Superelastic Technologies","volume":"100 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":"116840186","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：