Shape Memory Alloys for Seismic Resilience
Shape Memory Alloys for Seismic Resilience

Author: Cheng Fang

Publisher: Springer

Published: 2019-05-25

Total Pages: 284

ISBN-13: 9811370400

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This book introduces readers to the fundamental properties and practical applications of shape memory alloys (SMAs) from the perspective of seismic engineering. It objectively discusses the superiority of this novel class of materials, which could potentially overcome the limitations of conventional seismic control technologies. The results, vividly presented in the form of tables and figures, are demonstrated with rigorous experimental verifications, supplemented by comprehensive numerical and analytical investigations. The book allows readers to gain an in-depth understanding of the working mechanisms of various SMA-based structural devices and members, including beam-to-column connections, dampers, and braces, while also providing them with a broader vision of next-generation, performance-based seismic design for novel adaptive structural systems. Helping to bridge the gap between material science and structural engineering, it also sheds light on the potential of commercializing SMA products in the construction industry. The cutting-edge research highlighted here provides technical incentives for design professionals, contractors, and building officials to use high-performance and smart materials in structural design, helping them stay at the forefront of construction technology.

Cyclic Testing and Assessment of Shape Memory Alloy Recentering Systems
Cyclic Testing and Assessment of Shape Memory Alloy Recentering Systems

Author: Matthew S. Speicher

Publisher:

Published: 2009

Total Pages:

ISBN-13:

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In an effort to mitigate damage caused by earthquakes to the built environment, civil engineers have been commissioned to research, design, and build increasingly robust and resilient structural systems. Innovative means to accomplish this task have emerged, such as integrating Shape Memory Alloys (SMAs) into structural systems. SMAs are a unique class of materials that have the ability to spontaneously recover strain of up to 8%. With proper placement in a structural system, SMAs can act as superelastic "structural fuses", absorbing large deformations, dissipating energy, and recentering the structure after a loading event. Though few applications have made it into practice, the potential for widespread use has never been better due to improvements in material behavior and reductions in cost. In this research, three different SMA-based structural applications are developed and tested. The first is a tension/compression damper that utilizes nickel-titanium (NiTi) Belleville washers. The second is a partially restrained beam-column connection utilizing NiTi bars. The third is an articulated quadrilateral bracing system utilizing NiTi wire bundles in parallel with c-shape dampers. Each system was uniquely designed to allow a structure to undergo large drift demands and dissipate energy while retaining strength and recentering ability. This exploratory work highlights the potential for SMA-based structural applications to enhance seismic structural performance and community resilience.

Shape Memory Alloys in Civil Engineering
Shape Memory Alloys in Civil Engineering

Author: Bassem Andrawes

Publisher: Springer

Published: 2024-09-28

Total Pages: 0

ISBN-13: 9783031680007

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This book presents a new class of metallic materials, called shape memory alloys (SMAs), as emerging materials for civil engineering applications. These materials have been used for decades in high-end fields like the aerospace and biomedical fields, and possess extraordinary properties that have attracted the attention of civil engineering researchers and practitioners for over 25 years. In this volume, based on 20 years of research findings, the author describes how SMAs started to find their way into practical applications in civil engineering. And that, like any metal, SMAs are produced in any shape, size, or form including wire, bar, and sheet, but unlike other metals, SMAs exhibit a unique ability to recover their original shape/size after being excessively deformed. Given the demand for sustainability and resilience in civil engineering applications, this book is ideal for civil engineering practitioners and materials researchers concerned with building materials and civil infrastructure.

Performance of Superelastic Shape Memory Alloy Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading
Performance of Superelastic Shape Memory Alloy Reinforced Concrete Elements Subjected to Monotonic and Cyclic Loading

Author: Alaa Abdulridha

Publisher:

Published: 2013

Total Pages:

ISBN-13:

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The ability to adjust structural response to external loading and ensure structural safety and serviceability is a characteristic of Smart Systems. The key to achieving this is through the development and implementation of smart materials. An example of a smart material is a Shape Memory Alloy (SMA). Reinforced concrete structures are designed to sustain severe damage and permanent displacement during strong earthquakes, while maintaining their integrity, and safeguarding against loss of life. The design philosophy of dissipating the energy of major earthquakes leads to significant strains in the steel reinforcement and, consequently, damage in the plastic hinge zones. Most of the steel strain is permanent, thus leading to large residual deformations that can render the structure unserviceable after the earthquake. Alternative reinforcing materials such as superelastic SMAs offer strain recovery upon unloading, which may result in improved post-earthquake recovery. Shape Memory Alloys have the ability to dissipate energy through repeated cycling without significant degradation or permanent deformation. Superelastic SMAs possess stable hysteretic behavior over a certain range of temperature, where its shape is recoverable upon removal of load. Alternatively, Martensite SMAs also possess the ability to recover its shape through heating. Both types of SMA demonstrate promise in civil infrastructure applications, specifically in seismic-resistant design and retrofit of structures. The primary objective of this research is to investigate experimentally the performance of concrete beams and shear walls reinforced with superelastic SMAs in plastic hinge regions. Furthermore, this research program involves complementary numerical studies and the development of a proposed hysteretic constitutive model for superelastic SMAs applicable for nonlinear finite element analysis. The model considers the unique characteristics of the cyclic response of superelastic materials.

Advances in Shape Memory Materials
Advances in Shape Memory Materials

Author: Qingping Sun

Publisher: Springer

Published: 2017-03-14

Total Pages: 245

ISBN-13: 3319533061

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This book is devoted to the development of the shape memory materials and their applications. It covers many aspects of smart materials. It also describes the method on how we can obtain not only large recovery strains but also high recovery stress, energy storage and energy dissipation in applications. This volume treats the mechanical properties of shape memory alloys, shape memory polymers and the constitutive equations of the materials which are necessary to design the shape memory elements in applications. It also deals with the fatigue properties of materials, the method to design the shape memory elements, and the shape memory composites. The authors are international experts on shape memory alloys and shape memory polymers in the metallurgical, chemical, mechanical and engineering fields. The book will be of interest to graduate students, engineers, scientists and designers who are working in the field of electric and mechanical engineering, industries, medical engineering, aerospace engineering, robots, automatic machines, clothes and recycling for research, design and manufacturing.

Shape Memory Alloys - New Advances
Shape Memory Alloys - New Advances

Author: Mohammad Asaduzzaman Chowdhury

Publisher: BoD – Books on Demand

Published: 2024-03-27

Total Pages: 96

ISBN-13: 1837697272

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Shape Memory Alloys - New Advances is a collection of reviewed and relevant research chapters, offering a comprehensive overview of recent developments in the field of shape memory alloys. It provides a thorough overview of the latest research efforts by international authors on shape memory alloys and opens new possible research paths for further novel developments.

High Temperature Shape Memory Alloys for Useful Devices
High Temperature Shape Memory Alloys for Useful Devices

Author:

Publisher:

Published: 2001

Total Pages: 27

ISBN-13:

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The goal of this project was to develop shape memory alloys with transition temperatures above 100 deg C. The main focus was on TiNiHf. Special vacuum sputtering setups were used to produce thin films having variations in composition, ranging from those rich in Ti+Hf to those rich in Ni. Three targets were used: TiNi, Hf, and Ni. Deposition rates were calibrated separately for each target. These calibrations were used to calculate composition of film deposited by simultaneous sputtering from all three targets. Although this procedure does not permit measurement of absolute composition, it makes possible a methodical search for alloys with increased transition temperature and improved ductility by systematic and controlled variation of composition. Depositions were done with predicted alloy compositions close to 50 at% Ni, the balance being Ti+Hf. The Hf concentration was varied within the range 10 - 15 at%. TiNiHf films were produced having transition temperatures above 100 deg C, with austenite finish temperatures as high as 170 deg C. Measurements of phase transformation temperature, ductility, and composition were made. High ductility and shape recovery up to 4 percent was achieved. Micromachined valve actuators were fabricated and tested. Actuators demonstrated thermomechanical performance similar to that of binary TiNi film.