Magnetically tunable damping in composites for 4D printing

Bonifacich, Federico Guillermo; Lambri, O.A.; Recarte, V.; Pérez-Landazábal, J.I.

doi:10.1016/j.compscitech.2020.108538

Cited by 20 publications

(19 citation statements)

References 65 publications

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“…The non‐Newtonian index ( n ) of PP approached unity. The G' of SPB is between that of pure SEBS and pure PP at high angular frequency, the curve of SPB is close to that of SEBS but separated from that of PP, which is due to the smaller volume fraction of PP in SPB samples 36–38 . However, in the low frequency range, it became higher than that of SEBS and PP.…”

Section: Resultsmentioning

confidence: 79%

“…The G' of SPB is between that of pure SEBS and pure PP at high angular frequency, the curve of SPB is close to that of SEBS but separated from that of PP, which is due to the smaller volume fraction of PP in SPB samples. [36][37][38] However, in the low frequency range, it became higher than that of SEBS and PP. This may be attributed to the phase separation induced by low frequency shear, 39 where the dispersed PP molecules oriented along the forces, obstructed the movement of SEBS molecules, resulting in a high storage modulus.…”

Section: Rheological Property Analysismentioning

confidence: 88%

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The effect of process parameters on the properties of elastic melt blown nonwovens: Air pressure and DCD

Zhou

Dai

et al. 2022

J of Applied Polymer Sci

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An elastic masterbatch and elastic melt blown nonwovens are prepared based successively on styrene‐ethylene/butylene‐styrene (SEBS) and polypropylene (PP) blend. The phase separation morphology, rheological properties and crystal structure of the elastic masterbatch are investigated. The results show that a compatible and stable structure is obtained in molten SEBS and PP blend with excellent mobility in the temperature range of 210–230°C. The crystallization of PP slows down resulting in a finer structure due to the restriction of the SEBS network structure with rarely change of crystalline structure. The relationship between process parameters and properties of the elastic nonwoven is also studied in detail. Air pressure and die to collector distance (DCD) have discernible effects on fiber diameter and bonding between fibers, further influencing the performances of nonwovens including porosity, tensile strength and elastic recovery. Elastic recovery is shown to be significantly more affected by DCD than by air pressure.

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Section: Resultsmentioning

confidence: 79%

Section: Rheological Property Analysismentioning

confidence: 88%

The effect of process parameters on the properties of elastic melt blown nonwovens: Air pressure and DCD

Zhou

Dai

et al. 2022

J of Applied Polymer Sci

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“…Into the bargain, ferromagnetic shape memory alloys (FSMAs) have attracted much attention in the scientific community in the last decade due to their multifunctional properties linked to the presence of the martensitic transformation (MT) [15][16][17]. The giant inverse magnetocaloric effect (MCE), magnetic actuation, giant magnetoresistance, and magnetically tuneable mechanical damping are the main properties of these functional alloys [18][19][20][21][22][23][24]. In addition, unlike classic devices used in the field of engineering and technology, the actuation capacity of FSMA arises from their intrinsic thermomechanical properties, allowing for drastic reductions in size, weight, and complexity of the devices.…”

Section: Introductionmentioning

confidence: 99%

High functional 3D printed PCL/FSMA magnetic composites

Lambri,

Bonifacich,

Lambri

et al. 2024

Smart Mater. Struct.

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The capacity of adaptability of a 3D-printed composite of polycaprolactone-based containing micro-particles of ferromagnetic shape memory alloy of composition Ni45Mn36.7In13.3Co5 was determined. Composites exhibit an increase in both damping and modulus values up to around 11%, at temperatures close to 325 K, when applying a magnetic field of 120 kA/m. In addition, composites show also an increase in the damping values of around 50% at temperatures near 333 K, related to the martensitic transformation, which is promoted by an increase in the oscillating strain from 0.5x10-4 up to 2x10-4 and when applying a magnetic field of 120 kA/m. Moreover, the maximum temperature of use of the composite can be increased by means of a magnetic field. These adaptability qualities make this functional composite attractive, for the vibration control at elevated temperatures as well as the potential applications in magnetocaloric devices.

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“…This revolutionary subfield of additive manufacturing has found many * Author to whom any correspondence should be addressed. applications and improvements in major ways in the fields of biomedical engineering [3,4], robotics [5,6], and selfassembly structures [7,8]. Much like microelectromechanical systems, which work towards small functional systems for sensing or actuation, the ability of printed objects to change their shapes has the potential to provide alternative methods of actuations that may be simpler to implement in some cases [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of printing parameters on 4D-printed PLA actuators

Alshebly

Nafea

2023

Smart Mater. Struct.

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Controlling the printing parameters of four-dimensional (4D) printed actuators can be used to set the internal strain of the actuators. This approach can be utilised when using the fused deposition modelling method to develop 4D-printed actuators, allowing non-manual shape programming. However, there is a lack of comprehensive studies that investigate the effects of printing parameters on the actuation performance of 4D-printed actuators. In this study, the effects of four printing parameters on the bending angle of 4D-printed polylactic acid (PLA) actuators are reported. These printing parameters include the printing speed, printing temperature, ratio of passive-to-active layers, and layer height. In addition, these printing parameters are investigated while changing the height of the actuators. The results show that increasing the printing speed increases the internal strain while increasing the printing temperature, layer height, or actuator height has the opposite effect. Moreover, it is found that a ratio of passive-to-active layers of 50% maximises the strain while selecting a higher or lower ratio causes the opposite effect. Based on the results, four mathematical predictive models are developed to determine the bending angle induced in the actuators when printed based on each printing parameter. Then, a predictive model that relates all the printing parameters and actuator height to the bending angle is developed. The predictive model is based on the characterization results of 534 PLA actuators, providing an R-squared value of 0.98. Then, a finite element analysis (FEA) model is developed to replicate the shape memory effect in actuators. To prove the accuracy of the proposed concept, two grippers with four and eight fingers are developed. The results show that the printing parameters can be used to control the bending angle of each finger based on the design specifications.

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Magnetically tunable damping in composites for 4D printing

Cited by 20 publications

References 65 publications

The effect of process parameters on the properties of elastic melt blown nonwovens: Air pressure and DCD

The effect of process parameters on the properties of elastic melt blown nonwovens: Air pressure and DCD

High functional 3D printed PCL/FSMA magnetic composites

Effects of printing parameters on 4D-printed PLA actuators

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