medical staples are one of the nitinol shape memory alloys applications which their pedicles have to be bent for suitable function with an appropriate angle at a specified temperature .it is achievable by shape memory effect. for this purpose, samples of nitinol super elastic alloys were bent in a steel mold with different angles & formed orthopedic staples. then shape memory effect was ind...

In the present research, in contrast to the available papers, not only the superelasticity but also the shape memory effects are taken into account in determination of the impact responses. At the same time, in addition to modifying Brinson’s model for the shape memory alloys (SMAs), to include new parameters and loading events, and Hertz contact law, distributions of the SMA phases are conside...

Thin-film shape memory alloys (SMAs) have become excellent candidates for microactuator fabrication in MEMS due to their capability to achieve very high work densities, produce large deformations, and generate high stresses. In general, the material behavior of SMAs is nonlinear and hysteretic. To achieve the full potential of SMA actuators, it is necessary to develop models that characterize t...

The paper presents the design strategies for two typical configurations of intelligent systems, using as active elements the Shape Memory Alloy (SMA) cantilever strip and the SMA helical spring. Based on the advantages and unique properties of shape memory alloys the authors defined the operating mode, the mechanical considerations and the design assumptions for these two examples. It also incl...

In many applications, Cu base Shape Memory Alloys (SMA S) are a more economical alternative to other systems showing Shape Memory Effect (SME). However, bearing in mind the potential use of these SMA it is becoming increasingly important to develop suitable techniques to join them satisfactorily to themselves and to another material. In that sense, a liquid phase diffusion bonding process with ...

This paper considers a thermomechanical model describing the behavior of shape memory alloys (SMA). This new model (see [3]) takes into account the nonisothermal character of the phase transformations, as well as the existence of the intrinsic dissipation. For the governing equations we prove existence, uniqueness and regularity in certain well chosen functions spaces. MSC: 74N30, 74H20, 74H25.

40 Shape memory alloys (SMAs) are a class of smart materials that recover apparent plastic 41 deformation (~6-8% strain) after heating, thus “remembering” the original shape. This 42 shape memory effect (SME) can be exploited for self post-tensioning applications and 43 NiTi-based SMAs are promising as SME is possible at elevated temperatures amenable 44 to practical application compared to con...

This paper examines the variables inherent in the shape-changing phenomenon and suggests a new method of experimenting with shape memory alloys (SMA) to direct kinesis. This method widens the range of potential interactive applications beyond the traditional “on-off” state. The resulting flexibility permits personalization throughout the course of the transformation, enhancing the use of the ma...

Shape Memory Alloys (SMA) have the unique capability to recover the original shape, once mechanically deformed, through mechanical unloading, Superelastic Effect (SE), or through thermal loading, Shape Memory Effect (SME). These peculiar behaviors, coupled with a good material biocompatibility, have stimulated a wide diffusion of SMA in the area of biomedical devices. In this work we numericall...

Shape memory alloys (SMAs) are materials that exhibit a distinct thermomechanical coupling, one that gives rise to a wide variety of applications across a broad range of fields. One of the most successful roles is in the construction of novel medical implants. Unfortunately, concerns have been raised about the biocompatibility of the most popular SMA, nitinol (NiTi), due to the known toxic, all...