Publication

Experimental Behavior and Nonlinear Modeling of iron-based Shape Memory Alloys (SMAs) under Inelastic Cyclic Straining

2020
Student Projects

Abstract

Shape memory alloys (SMAs) have gained considerable attention in a broad range of engineering applications. In particular, iron-based SMAs (Fe-SMAs) have been recently developed and used as a cost-eﬀective method for prestressed-strengthening of civil structures. Previous studies have shown that Fe-SMAs oﬀer a strong shape memory eﬀect (SME), however, a negligible superelastic behavior. The potential use of Fe-SMAs in seismic design and retroﬁt applications including supplemental damping is not yet clear and requires the further understanding of the material behavior under large amplitude cyclic inelastic straining. This thesis discusses key ﬁndings from a material-level experimental program that involved Fe-SMA round coupons subjected to a broad range of uniaxial cyclic strain histories representative of earthquake loading. Also, this work discusses the nonlinear modeling of Fe-SMAs under cyclic tension/compression straining.

Official source

https://infoscience.epfl.ch/entities/publication/f0cca8de-23e2-44fa-8385-ae274615ac80

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2020
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f0cca8de-23e2-44fa-8385-ae274615ac80

About this result

Related concepts (32)

Shape-memory alloy

In metallurgy, a shape-memory alloy (SMA) is an alloy that can be deformed when cold but returns to its pre-deformed ("remembered") shape when heated. It is also known in other names such as memory metal, memory alloy, smart metal, smart alloy, and muscle wire. The "memorized geometry" can be modified by fixating the desired geometry and subjecting it to a thermal treatment, for example a wire can be taught to memorize the shape of a coil spring.

Earthquake engineering

Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind. Its overall goal is to make such structures more resistant to earthquakes. An earthquake (or seismic) engineer aims to construct structures that will not be damaged in minor shaking and will avoid serious damage or collapse in a major earthquake. A properly engineered structure does not necessarily have to be extremely strong or expensive.

Seismic retrofit

Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged. Prior to the introduction of modern seismic codes in the late 1960s for developed countries (US, Japan etc.) and late 1970s for many other parts of the world (Turkey, China etc.

Related publications (17)

Experimental Behavior and Nonlinear Modeling of iron-based Shape Memory Alloys (SMAs) under Inelastic Cyclic Straining

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