List of Articles shape memory

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  1 - The Effect of Heat Treatment on the Microstructural and Superelastic Behavior of NiTi Alloy with 58.5 wt. % Ni
  M. Paryab
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  2 - Review of Smart Metallic Materials Classification
  H Sabet B Karbakhsh Ravari
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  3 - Effect of Important Physical and Geometrical Parameters on the Dynamic Response of Thick Composite Plates with Smart Attached Mass
  Ali Pourmoayed keramat Malekzadeh Fard naser zolghadr
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  4 - Behavior of Lightweight Smart Sandwich Panels Subjected to Tensile and Bending Loads- An Experimental Study
  sameera Khalili s. Mohammad Khalili Reza Eslami Farsani Puneet Mahajan
  10.30486/admt.2022.1937484.1302
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  5 - Nd:YAG laser processing of thick NiTi wires to locally alter ‎transformation properties towards achieving multiple memory ‎shape memory alloys
  Amin  Alipour Mahmoud Kadkhodaei Ehsan  Foroozmehr
  10.30486/ADMT.1403.873806
  Every commercial NiTi (Nitinol) Shape Memory Alloy (SMA) has its own transformation temperatures, which may cause limitations in ever-growing demands for the application of these alloys in novel engineering design. Among various methods proposed to achieve multiple func More

  Every commercial NiTi (Nitinol) Shape Memory Alloy (SMA) has its own transformation temperatures, which may cause limitations in ever-growing demands for the application of these alloys in novel engineering design. Among various methods proposed to achieve multiple functional characteristics, laser processing offers effective solutions in locally controlling the transformation properties of NiTi parts. The current work describes the application of laser technique followed by post processing to locally alter transformation temperatures and impose phase transition for thick NiTi wires. To this end, various laser parameters are applied, and the influences of peak power and pulse width on the functional, microstructural and mechanical properties of laser processed samples are studied. A four-sided laser processing protocol is proposed to process almost the whole cross section of thick Nitinol wires. It is also shown that post-processing heat treatment is required to recover the shape memory properties of as-processed Nitinol specimen. The transformation temperatures of final processed Nitinol wire increase by about 50 °C compared to those of the unprocessed base material. Manuscript profile
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  6 - Behavior and mechanical properties of shape memory alloys in smart materials and its application in various industries
  Mahdi Rezvani Tavakol
  With the growth and improvement in information technology over the past twenty years, the word "smart" increasingly on the materials, objects and the environment have been used. Hashmi the property that materials have been found in all groups. In Hadith of materials suc More

  With the growth and improvement in information technology over the past twenty years, the word "smart" increasingly on the materials, objects and the environment have been used. Hashmi the property that materials have been found in all groups. In Hadith of materials such as composites, polymers, ceramics and metals can be advanced that the materials found by a series of processes, intelligent properties found. Smart materials are those materials also say that they can understand their surrounding environment and react to it. Now smart composites and metals are used on many occasions and have found their place in the industry. In this paper, the shape memory alloy as well as the efficiency of this type of smart materials in the industry have been discussed. Shape memory alloys that change shape in response to temperature changes caused by the conversion phase and some other materials that show and irritability sensing capability can be a range of smart materials. Manuscript profile
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  7 - Effect of Alumina Nanoparticles on the Enhancement of Shape Memory, Mechanical and Impact Properties of TPU/ABS blend
  Zeinab Sohrabi Abdolhossein Fereidoon Farzaneh Memarian
  10.22034/jna.2016.03.004
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  8 - Effect of Electrical Current on Nitinol Medical Staples Shape Memory
  Nahid Hasanzadeh Nematy Fatemeh Farhadi Sahar Shapurgan
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  9 - Improving the seismic performance of the butterfly slit damper using a nitinol shape memory alloy in the diagonal CBF brace
  farzad vafadar Vahid Broujerdian ali ghamari
  Reinforcement of structures is not cost-effective despite plastic deformation in the main members. Therefore, this defect can be solved by adding dampers. The function of the damper is in such a way that before the bracing member, it surrenders and prevents the creation More

  Reinforcement of structures is not cost-effective despite plastic deformation in the main members. Therefore, this defect can be solved by adding dampers. The function of the damper is in such a way that before the bracing member, it surrenders and prevents the creation of a plastic joint in it. Although the existence of a damper improves the seismic behavior, it does not affect the reversibility of the structure, and their repair after an earthquake is sometimes accompanied by problems due to permanent changes in the entire structure. Shape memory alloys (SMA) as smart materials compensate for many shortcomings of current energy consuming systems. The effect of shape memory system, elastic behavior, inherent damping and high strength are the most important characteristics of these alloys. In this research, a new type of slit damper (under the title of butterfly slit damper) has been analyzed in four groups with different dimensional ratios h1/h and b1/b, with and without SMA, by adding bar-type SMA and placing it in such a way that in loads Compressive and tensile force created in the brace, there is always a tensile force in a number of SMAs. In the proposed combination, the diagonal element under the effect of tensile and compressive force causes cutting in the slit damper and tension in the SMA.The results showed that the use of SMA, in addition to increasing the hardness and resistance of the system, creates the ability to accept and eliminate the phenomenon of buckling of the brace under pressure Manuscript profile
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  10 - Improving the Seismic Performance of the Butterfly Slit Damper Using a Nitinol Shape Memory Alloy in the Diagonal CBF Brace
  farzad vafadar Vahid Broujerdian Ali Ghamiri
  10.30495/civil.2024.709661
  Reinforcement of structures is not cost-effective despite plastic deformation in the main members. Therefore, this defect can be solved by adding dampers. The function of the damper is in such a way that before the bracing member, it surrenders and prevents the creation More

  Reinforcement of structures is not cost-effective despite plastic deformation in the main members. Therefore, this defect can be solved by adding dampers. The function of the damper is in such a way that before the bracing member, it surrenders and prevents the creation of a plastic joint in it. Although the existence of a damper improves the seismic behavior, it does not affect the reversibility of the structure, and their repair after an earthquake is sometimes accompanied by problems due to permanent changes in the entire structure. Shape memory alloys (SMA) as smart materials compensate for many shortcomings of current energy consuming systems. The effect of shape memory system, elastic behavior, inherent damping and high strength are the most important characteristics of these alloys. In this research, a new type of slit damper (under the title of butterfly slit damper) has been analyzed in four groups with different dimensional ratios h1/h and b1/b, with and without SMA, by adding bar-type SMA and placing it in such a way that in loads Compressive and tensile force created in the brace, there is always a tensile force in a number of SMAs. In the proposed combination, the diagonal element under the effect of tensile and compressive force causes cutting in the slit damper and tension in the SMA. The results showed that the use of SMA, in addition to increasing the hardness and resistance of the system, creates the ability to accept and eliminate the phenomenon of buckling of the brace under pressure. Manuscript profile
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  11 - The Effect of SMA Damper on Energy Dissipation and Eduction of Vibration Amplitude of Multi-Story Steel Frames
  Ali Seyedkazemi milad esmaeili saman eftekhar ardabili morteza hoseinali beygi
  In recent years, the idea of ​​using durable materials which are capable of absorbing energy and have high ductility are highlighted in structural engineering. One example of these materials is shape memory alloys which show predefined physical properties in different c More

  In recent years, the idea of ​​using durable materials which are capable of absorbing energy and have high ductility are highlighted in structural engineering. One example of these materials is shape memory alloys which show predefined physical properties in different conditions. These materials show little residual strain under loading and unloading cycles even when passing through the yield area. In fact, they create regenerative forces in structures. In this study, the effect of shape memory alloys on energy dissipation and reducing vibration amplitude of multi-story steel frame is investigated. For the present purpose, shape memory alloy rebars are used in the middle of the diagonal elements of braces. ABAQUS software is used in the present study. To validate models, first, two-story braced frame with shape memory alloy used in the laboratory studies of Han et al (2003) is modeled and analyzed in the software. The results obtained by the two laboratory and analytical methods are in acceptable agreement. To investigate the effect of height on the seismic performance of the buildings equipped with this type of dampers, 3- and 12-story buildings were considered and reciprocating nonlinear analysis and nonlinear dynamic time history analysis using Tabas accelerogram were performed. Results show that using this type of dampers cause quick energy dissipation and a significant reduction in the vibration amplitude and base shear so that the existence of shape memory alloy in 3-story building makes the ability of the structural system in dissipating energy and the initial stiffness of the system increase 2.5 and 2 times respectively. Moreover, with an increase in height, its effectiveness in controlling the seismic response of structure is reduced between 10-15 percent. Manuscript profile
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  12 - Evaluating the seismic performance of steel-sma hybrid Bracing structures
  mohammad hooshmand behzad rafezi jafar khalileAlafi
  In this study the seismic performance of hybrid braces composed of steel and shaped- memory alloys (SMA). is investigated Six types of hybrid braces were used, constituted by SMA content of 0, 20, 40, 60, 80, and 100%. A nonlinear dynamic analysis was performed under El More

  In this study the seismic performance of hybrid braces composed of steel and shaped- memory alloys (SMA). is investigated Six types of hybrid braces were used, constituted by SMA content of 0, 20, 40, 60, 80, and 100%. A nonlinear dynamic analysis was performed under El Centro earthquake records, with the maximum acceleration of 0.6g and 0.9g. Our results showed that the seismic performance, i.e., the amount of energy absorption and residual strain, of steel–SMA hybrid braces depends on the SMA content. The optimal value of SMA content was 20%, as, at this concentration, a hybrid brace can be designed with good seismic performance at a justifiable fabrication cost. Manuscript profile
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  13 - Finite Element Analysis of the Pseudo-elastic Behavior of Shape Memory Alloy Truss and Beam
  Kamal M. Bajoria Surajit Das
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  14 - Investigating the Effect of Poly (D L-Lactic Acid) Molecular Weight on the Shape Memory Parameters: A Molecular Dynamics Study
  Mohammad Amini Abbas Montazeri
  Shape memory polymers are a subset of smart materials that can regain their original shape after a temporary deformation. In recent years, these polymers have been vastly utilized in many industries (especially biomedical). The main purpose of this study was to find the More

  Shape memory polymers are a subset of smart materials that can regain their original shape after a temporary deformation. In recent years, these polymers have been vastly utilized in many industries (especially biomedical). The main purpose of this study was to find the influence of the polymer molecular weight on the various shape memory parameters. Additionally, the mechanisms governing the shape memory behavior of polymers are thoroughly studied. Calculating the glass transition temperature and exploring its role on the shape memory behavior of polymeric materials are the other objectives of the current research. In this study, all models were built via Materials Studio and all the simulations were carried out using LAMMPS software. Based on the obtained results, the glass transition temperature of polymer increases with increasing the degree of polymerization. The attempts made to achieve an optimal microstructure revealed that the shape fixity parameter increases from 90% to 94% with increasing the molecular weight from 36000 g/mol to 108000 g/mol. In contrast to the shape fixity, the shape recovery parameter follows a descending trend with increasing the molecular weight. This is attributed to an increase in the ratio of the fixed phase to its reversible counterpart. Manuscript profile
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  15 - Influence of mechanical alloying and preheating on fabrication of NiTi alloy by combustion synthesis
  Ali Reza Sadegi Aval Shahr Hassan Mostajab o daveh Abolfazl Babakhani Mojtaba Zebarjad Akram Salehi
  In this study Ni and Ti with 50 at. % Ni powders were milled and the cylindrical performs obtained by uniaxial cold compaction under 150 MPa pressure. Porous Ni/Ti specimens were synthesized by thermal explosion (TE) at different preheating temperatures (350 °C, 400 More

  In this study Ni and Ti with 50 at. % Ni powders were milled and the cylindrical performs obtained by uniaxial cold compaction under 150 MPa pressure. Porous Ni/Ti specimens were synthesized by thermal explosion (TE) at different preheating temperatures (350 °C, 400 °C, 500 °C and 600 °C) and milling times (0.5, 1 and 2h). The effect of preh­­­eating temperatures and milling times on microstructure of final products were investigated by X-ray diffraction analysis (XRD), optical microscopy and scanning electron microscopy (SEM). NiTi shape memory alloy with other secondary intermetallic compounds and elemental powders were observed in the final products. Results showed the dominant phase was NiTi in the sample that milled for 1h and preheated at 400 °C. Manuscript profile
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  16 - تحلیل غیرخطی رفتار ترمومکانیکی مواد مرکب فعال شده بوسیله الیاف آلیاژ حافظه دار
  سیامک مقبلی محمدجواد محمودی
  رفتار عمومی ترمومکانیکی مواد مرکب تقویت­شده با الیاف آلیاژ حافظه­دار با استفاده از یک روش تحلیلی میکرومکانیکی سه­بعدی به­منظور درنظرگرفتن  اثر فعال­شدن الیاف پیش­بینی می­شود. کامپوزیت به­واسطه این روش میکرومکانیکی می­تواند تحت با More

  رفتار عمومی ترمومکانیکی مواد مرکب تقویت­شده با الیاف آلیاژ حافظه­دار با استفاده از یک روش تحلیلی میکرومکانیکی سه­بعدی به­منظور درنظرگرفتن  اثر فعال­شدن الیاف پیش­بینی می­شود. کامپوزیت به­واسطه این روش میکرومکانیکی می­تواند تحت بارگذاری­های عمومی مکانیکی شامل بارگذاری عمودی و برشی و همچنین حرارتی قرار بگیرد که نهایتاً سبب فعال­شدن الیاف آلیاژ حافظه­دار در زمینه پلیمری می­گردد. با توجه به قابلیت­های مدل میکرومکانیکی ارائه شده، آرایش الیاف در زمینه به­صورت توزیع مریعی شبیه­سازی می­گردد.  المان حجمی نماینده­ی کامپوزیت از دو فاز شامل الیاف آلیاژ حافظه­دار و زمینه پلیمری تشکیل می­شود و تحت بارگذاری مکانیکی چرخه­ای محوری قرار می­گیرد. به­منظور نمایش اثر فعال­شدن الیاف بر پاسخ کلی کامپوزیت، رفتار زمینه پلیمر به­صورت الاستیک در نظر گرفته‌ می­شود و الیاف آلیاژ حافظه­دار به‌صورت غیرخطی غیرالاستیک بر اساس مدل سه بعدی لاگوداس شبیه­سازی می­گردد. این مدل قادر پیش­بینی اثرات استحاله فاز آلیاژ حافظه­دار و رفتار سوپرالاستیک آن­ها می­باشد. در راستای بسط معادلات ترمومکانیکی آلیاژ حافظه­دار در مدل سلول واحد، از روش حل عددی غیرخطی نیوتن- رافسون استفاده می­گردد. در قسمت نتایج ابتدا اثرات پارامترهای مهم بر پاسخ ترمومکانیکی کامپوزیت بررسی می­گردد و سپس پاسخ­های ترمومکانیکی کامپوزیت  در دو بازه دمایی زیاد و کم نشان داده‌ می­شود و اثر فعال­شدن سیم آلیاژ حافظه­دار درون کامپوزیت نمایش داده می­شود. نتایج بیانگر این نکته می­باشند که با افزایش دما کرنش باقیمانده در باربرداری مکانیکی در کامپوزیت کاهش می­یابد به­گونه­ای که هنگامی که دما بالاتر از ناحیه اتمام تشکیل آستنیت باشد کرنش باقیمانده در کامپوزیت به صفر میل می­کند. مقایسه نتایج تحقیق حاضر با تحقیقات موجود در دسترس پیشین، تطابق بسیار خوبی را نشان می­دهد. Manuscript profile
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  17 - تحلیل ارتعاشات غیرخطی ورق کامپوزیتی با الیاف حافظه دار با در نظر گرفتن تغییرات لحظه ای کسر حجمی فاز مارتنزیت
  محمد شرعیات سارا سمایی مجتبی مرادی
  در سال­های اخیر، پیشرفت­های زیادی در زمینه­ی تقویت سازه­های کامپوزیتی توسط آلیاژهای حافظه­دار صورت گرفته است. این مواد تحت بارگذاری سیکلی مکانیکی، از طریق ایجاد حلقه­ی برگشت­پذیر هیسترزیس، انرژی مکانیکی را جذب و یا تلف می کنند.این ویژگی­ More

  در سال­های اخیر، پیشرفت­های زیادی در زمینه­ی تقویت سازه­های کامپوزیتی توسط آلیاژهای حافظه­دار صورت گرفته است. این مواد تحت بارگذاری سیکلی مکانیکی، از طریق ایجاد حلقه­ی برگشت­پذیر هیسترزیس، انرژی مکانیکی را جذب و یا تلف می کنند.این ویژگی­بارز آلیاژهای حافظه­دار، آنها را برای کاربردهای حسگری، عملگری، جذب انرژی ضربه و میرایی ارتعاشات مناسب ساخته است.در کارهای ارائه شده تاکنون، تغییرات فاز لحظه­ای و موضعی سیم حافظه دار طی بارگذاری و باربرداری­های پی­در­پی در زمان ارتعاش سازه به فرمی دقیق بررسی نشده است.در مقاله کنونی، ارتعاشات ورق­ کامپوزیت هیبرید تقویت شده با آلیاژ حافظه­دار، با ارائه الگوریتمی مناسب جهت برطرف نمودن نارسایی یاد شده، مورد بررسی قرار گرفته است.برای به­دست آوردن معادلات ارتعاشی، از اصل همیلتون و تئوری تغییر شکل برشی مرتبه­ی اول استفاده شده­است. همچنین برای مدل سازی آلیاژ حافظه­دار، از معادلات بنیادین ارائه شده توسط برینسون استفاده شده و حل معادلات زمانی توسط روش انتگرال­گیری زمانی نیومارک صورت گرفته است. سیستم معادلات به دست آمده با استفاده از روش عددی اجزای محدود و کد نویسی به کمک نرم­افزار متلب، حل شده­اند. در این مقاله برای اولین بار تغییرات کسر حجمی مارتنزیت به واسطه­ی تغییرات تنش در هر زمان و تأثیر  آن روی خواص مکانیکی آلیاژ حافظه­دار و کامپوزیت هیبرید و نیروی بازیابی آلیاژ حافظه­دار در نظر گرفته شده­اند. در نهایت، تأثیر  کسر حجمی فیبرهای حافظه­دار در هر لایه و تأثیر  نیروی اعمالی بر رفتار ارتعاشی ورق کامپوزیتی تحت بار ضربه­ای نیز مورد بررسی قرار گرفته است. Manuscript profile
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  18 - Shape Memory Alloy (SMA) as Smart Materials Application in Structural Engineering in the Last Decade
  R. Jamalpour
  The shape memory alloys (SMAs) is a specific property some materials have to restore their original shape. This strange behavior has caused these materials to be classified as smart materials. Due to the capabilities of this material, it has been used in all industries, More

  The shape memory alloys (SMAs) is a specific property some materials have to restore their original shape. This strange behavior has caused these materials to be classified as smart materials. Due to the capabilities of this material, it has been used in all industries, and in the last decade, its use has developed tremendously. In this article, while dealing with their general properties and production method, their applications especially in structural and earthquake engineering have been reviewed and investigated. For this reason, some of the works and studies done by structural engineering researchers in the recent period (from 2014 to 2024) in the field of structural engineering and with the approach of evaluating connections equipped by shape memory alloys have been mentioned. Finally, while examining the details of a Practical study in the field of steel column connection to the foundation, which was done with and without using of shape memory alloys, the advantages of using shape memory alloys in connections are summarized in the results. Manuscript profile