The work is primarily devoted to the peridynamic model elaborated for a solid body made of shape memory alloys (SMAs). The superelasticity effect is taken into consideration as well as its practical applications. Hence, the numerical simulations, making use of the phenomena of superelasticity, are carried out for the model of an SMA wire to investigate mechanical energy dissipation. The nonlocal peridynamic model of an SMA component is derived based on the theory proposed by Lagoudas-introduced to describe the phenomenon of solid phase transitions that occur in SMA. The results of the conducted experimental work
Purpose
This paper aims to investigate the influence of the manufacturing stages on three-dimensionally printed elements via material extrusion (MEX).
Design/methodology/approach
Three factors were identified: the printer, slicer and filament. The impact of each of them was considered by analysing the results from tensile tests, performed on the printed specimens. Using the Prusa MK3S and Anet A6 printers, Cura and PrusaSlicer software as well as Prusa and Plast-Spaw filaments allowed to determine the main factor which affected the differences in the observed sample responses. Additionally, two manufacturing parameters were considered: the infill density and layer height.
Findings
The obtained results showed that the experimental results depend on the process parameters. Firstly, the slicer and next, the printer, had the biggest impact on the mechanical behaviour of the samples, where the first determined the stiffness of the investigated parameter and the second determined its distribution. Finally, the presented results showed that the algorithms implemented in the slicers can have a greater significance that the defined inputs value.
Originality/value
The paper’s aim is recognition of the main sources of inaccuracies in elements produced via the MEX technology. The presented results showed that slicer inputs influenced the mean values of the printed elements’ mechanical parameters, while the printer features affected their distribution. Moreover, the results showed that mechanical behaviours of printed elements can differ significantly depending on the software used. It could explain the discrepancies presented in the conclusions by various researchers.
Abstract. Relatively recent discovery of shape memory alloys (SMA) justifies ongoing research on their properties and an attempt to explain the physical phenomenon responsible for the characteristic behaviour of SMA. Moreover, there have been reported many successful commercial SMA applications to medical cases, mostly based on superelasticity. Even though a wide application range is confirmed, its further contribution growth is currently not seen -mostly due to deficiency of reliable modelling techniques. Recently, lively discussion in the SMA academic community is observed, which deals with modelling issues and numerical implementation. Considering the current trends, the authors of the work make an attempt at qualitative analysis of the material properties for superelasticity. The material characteristics -found using static stretching tests -are sensitive to the variation of local stresses induced in the area where a SMA sample is mounted in a fatigue testing machine. As shown, the phenomena present at the clamping area seem to initiate and govern the process of the solid phase transformation within the entire SMA body. The overall objective of the presented research is to assess the influence of the above stated boundary conditions on the properties of selected types of SMA, using both experimental and numerical results.
The objective of this paper is to show a designing process for actuators that utilizes shape-memory materials. Analytical studies are carried out to design a dot actuator to be used in an electronic Braille display. Shape-memory materials are a relatively new group of smart materials that exhibit the transformation of their internal structures in solid state phases resulting from external mechanical or thermal excitation. This unique property shows up as three phenomena: one-and two-way memory effects as well as superelasticity, which all significantly influence the change of both the material properties and geometry. Hence, shape-memory materials are used as actuators effectively controlled by the above-mentioned types of excitation. The work presents the design guidelines for a proposed technical solution as well as the phenomenon utilized in the elaborated model of the actuator. The authors derived the mathematical descriptions for the proposed design configuration and an example of the calculations is shown. Moreover, the characteristics of the elaborated configuration are also discussed, taking into account the range of application areas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.