Rate-dependent mechanical behavior of VHB 4910 elastomer

Sahu, Raj Kumar; Patra, Karali

doi:10.1080/15376494.2014.949923

Cited by 49 publications

(16 citation statements)

References 17 publications

(52 reference statements)

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“…This rate of displacement is chosen as half of the lowest strain rate reported in our previous work. 24 So the curves for energy dissipation behavior is recognized and Young's modulus is measured at 10% strain.…”

Section: Young's Modulus and Hysteresismentioning

confidence: 99%

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

Sahu

Patra

2021

J of Applied Polymer Sci

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The effects of solid fillers on optical, electrical, mechanical, and electromechanical actuation behavior of VHB 4910 elastomer is inadequate, possibly due to readiness as a foam tape that makes the filler reinforcement a challenging work. VHB 4910 is modified by filling graphene oxide (GO) particles to realize the influences on material behavior towards actuator applications. The elastomer samples are ultrasonicated, swollen then thermochemically cured in GO dispersed; deionized‐water, trimethylolpropane trimethylacrylate (TMPTMA) and toluene to prepare three different filled‐elastomers. Material modification is confirmed by analyzing optical micrograph, and FTIR spectra. Whereas, dielectric constant and Young's modulus are assessed to ensure the feasibility of modified elastomers for electromechanical actuation strain. Amongst the three, GO‐TMPTMA filled‐elastomer samples are considered to test electromechanical actuation using an in‐house designed diaphragm actuator. Results showed enhanced in‐plane actuation performance and electrical breakdown strength, dependent on the curing time and prestrain. This work may strengthen the future strategies of making VHB 4910‐composite for dielectric elastomer actuator based electromechanical devices.

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Section: Young's Modulus and Hysteresismentioning

confidence: 99%

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

Sahu

Patra

2021

J of Applied Polymer Sci

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“…First option is the so-called dog-bone samples that significantly reduce the grippers' (edge) effects due to the presence of enhanced areas at sample ends [17,54,58]. Second alternative route is the rectangular sample, in which a length to width ratio ⇡ 10:1 is maintained throughout the sample length [34,35,36,28,51,59]. Due to excessive costs for the DLS 3D printed dog-bone samples, the second option for the specimen preparation is adopted in the current study.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Such a dimension maintains 8:1 ratio (length: width). A similar sample dimension was taken previously in the case of soft polymers like SIL30 for testing a homogeneous tensile mode of deformation, see Liao et al [34,35,36], Johlitz et al [28], Sahu and Patra [51], Wissler and Mazza [59]. In order to prepare rectangular samples of 5 mm x 60 mm x 1mm, at first, desired lines are inscribed on the top of the big sample (100 mm x 120 mm) using a soft ballpoint pen.…”

Section: Sample Preparationmentioning

confidence: 99%

An additively manufactured silicone polymer: Thermo-viscoelastic experimental study and computational modelling

Hossain

Liao

2020

Additive Manufacturing

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The additive manufacturing (AM) is a new paradigm across various disciplines of engineering sciences. Despite significant advances in the areas of hard material printings, the options for 3D printed soft materials are still limited. Most of the existing 3D printed polymers are in the areas of acrylics and polyurethanes or their composites. Recently emerged Digital Light Synthesis (DLS) technology hugely accelerates the additive manufacturing of soft polymers. A DLS-inspired 3D printer uses a continuous building technique instead of a layer-by-layer approach, where the curing process is activated by an ultra-violet (UV) light. In this contribution, a DLS-based digitally printed silicone (SIL30) is experimentally characterized. To understand polymer's temperature-dependent mechanical responses, an extensive thermo-viscoelastic experimental characterisation at various strain rates under tensile deformation and temperature fields from -20 C to 60 C is performed. The study reveals significant effects of time-and temperature-dependency on the mechanical responses of the 3D printed silicone. Motivated by the thermo-mechanical results of the polymer, a thermodynamically consistent constitutive model at large strain is devised. Afterwards, the model is calibrated to the data that results in the identification of relevant parameters. The model predicts the experimental results with a good accuracy. 3D printed soft polymers are major candidates in designing complex and intricate architectured metamaterials for biomedical applications. Hence, a comprehensive thermo-mechanical experimental study and subsequent constitutive modelling will facilitate in designing and simulating more complex cellular metamaterials using 3D printed silicones.

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“…For calculation of crystallite size and microstrain, three trails were performed and based on the obtained results, mean, standard deviation and coefficient of variance were calculated and listed in Table 2. 29 In addition to this, variation of results are shown as error bar in the Figure 5. Similarly for other characterizing parameters (such as density, hardness, fracture toughness, residual stress), mean and standard deviation were estimated and shown as error bar in respective plot.…”

Section: Characterization Of Ball-milled Wc-co-caf 2 Powdersmentioning

confidence: 99%

Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

Parihar

Setti

Sahu

2017

Journal of Composite Materials

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Functionally graded cemented tungsten carbide belongs to a hybrid Functionally Graded Materials family. However synthesis of functionally graded cemented tungsten carbide is a great challenge due to possibility of “Co migration” and CaF2 vaporization during liquid phase sintering. Hence the present work deals with the development of nanocrystalline materials using ball milling and consolidation of milled material by Spark Plasma Sintering (SPS) for the preparation of functionally graded cemented tungsten carbide. The effects of ball milling and contents of Co, CaF2 and WC on WC/Co/CaF2 powder mixture were analyzed. Grain morphology, particle size, micro-strain, crystallite size, etc. of milled samples were investigated using scanning electron microscopy and X-Ray diffraction techniques. In addition to that, density, microstructure, hardness, fracture toughness and residual stress of consolidated sample are also reported. These tests confirm the formation of nanocrystalline particles and sub-sequent consolidation of functionally graded cemented tungsten carbide with solid lubricant. Hence ball milling with SPS is a prominent and viable process combination for the preparation of functionally graded cemented tungsten carbide.

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Rate-dependent mechanical behavior of VHB 4910 elastomer

Cited by 49 publications

References 17 publications

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

An additively manufactured silicone polymer: Thermo-viscoelastic experimental study and computational modelling

Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

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