Rheological and creep and recovery behavior of carbonyl iron water-based magnetorheological gel using laponite as an additive and oleic acid as a surfactant

2021 ◽  
Author(s):  
Chandra Shekhar Maurya ◽  
Chiranjit Sarkar
Keyword(s):  
Oleic Acid ◽  
Carbonyl Iron ◽  
Creep And Recovery ◽  
Water Based ◽  
Recovery Behavior

Synthesis and characterization of novel flake-shaped carbonyl iron and water-based magnetorheological fluids using laponite and oleic acid with enhanced sedimentation stability

2021 ◽  
pp. 1045389X2098700
Author(s):  
Chandra Shekhar Maurya ◽  
Chiranjit Sarkar
Keyword(s):  
Magnetic Field ◽  
Oleic Acid ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Carbonyl Iron ◽  
Vibration Isolation ◽  
Zero Field ◽  
Sedimentation Stability ◽  
Mr Fluids ◽  
Water Based

In this study, micron-sized flake shaped carbonyl iron (CI) water-based MR fluids were prepared with adding laponite and oleic acid as an additive and surfactant, respectively. The MR suspensions are comprised of the fixed CI particles and water weight %, while weight % of laponite and oleic acid changes from 1 to 3 wt% and 0.5 to 1.5 wt%, respectively. The remarkable enhancement in magnetorheological properties was obtained with improved sedimentation stability for CI/water MR suspensions with the addition of laponite and oleic acid. It was found that at the lowest magnetic field strength, the higher laponite concentration is effective, while at the highest magnetic field strength, the smaller concentration was effective. It was because of the combined effect of the field-induced CI chains and the laponite clay gel network. Its storage moduli showed a stable plateau area for whole angular frequencies, suggesting distinguished solid-like behavior of the MR fluid. Finally, a novel correlation was obtained between the initial settling rate of the CI particles and magnetorheological behavior of CI/laponite/OA MR suspensions with 1 wt% laponite and 0.5 wt% oleic acid, which has less zero-field, high on-state shear stress with enhanced sedimentation stability. The prepared MR fluids are a reliable industrial application vibration-isolation, clutch, and brake.

Dynamic and creep and recovery performance of Fe3O4 nanoparticle and carbonyl iron microparticle water-based magnetorheological fluid

2021 ◽  
pp. 1045389X2110263
Author(s):  
Chandra Shekhar Maurya ◽  
Chiranjit Sarkar
Keyword(s):  
Storage Modulus ◽  
Viscoelastic Material ◽  
Carbonyl Iron ◽  
Applied Strain ◽  
Plateau Region ◽  
Mr Fluid ◽  
Creep And Recovery ◽  
Linear Viscoelastic Material ◽  
Water Based ◽  
Stress Levels

This study investigates dynamic mechanical properties and creep and recovery behaviors of disc-shaped magnetic Fe3O4 nanoparticles with carbonyl iron (CI) flake-shaped microparticles in water-based MR fluid. The experimental study is performed using a parallel plate rheometer. Dynamic performance and creep and recovery behaviors help understand deformation mechanism for its practical applications in MR devices like seismic vibration control, active dampers, earthquake dampers, etc., under applied strain, and stress levels. The oscillatory experiment reveals a transition from viscoelastic-to-viscous behavior at the critical strain of 0.1%. The storage modulus [Formula: see text] of CI/Fe3O4 MR fluid showed a stable plateau region over the small strain area and storage modulus [Formula: see text] independent of strain amplitude. The frequency experiment demonstrated that storage moduli [Formula: see text] exhibit elastic response and stable plateau region over the complete external frequency range, suggesting the distinguished solid-like behavior of the MR fluid. Creep and recovery experiments showed that fluid acts as a linear viscoelastic material at lower stress levels. As the stress levels increase, the contribution of retardation strain and viscous strain decreases, and it acts like nonlinear viscoelastic material. In summary, this work is expected to obtain MR fluid results for application in MR devices under applied strain, frequencies, and constant stress levels.

Experimental and numerical investigation of cyclic creep and recovery behavior of bovine cortical bone

2020 ◽  
Vol 146 ◽  
pp. 103407
Author(s):  
Martina Lovrenić-Jugović ◽  
Zdenko Tonković ◽  
Ivica Skozrit
Keyword(s):  
Cortical Bone ◽  
Numerical Investigation ◽  
Cyclic Creep ◽  
Creep And Recovery ◽  
Recovery Behavior

Capacitance creep and recovery behavior of magnetorheological elastomers

2020 ◽  
pp. 1045389X2096991
Author(s):  
Yuqin Fan ◽  
Hong Qin ◽  
Chuan Lu ◽  
Changrong Liao ◽  
Xianping Chen ◽  
...  
Keyword(s):  
Mechanical Strain ◽  
High Sensitivity ◽  
Experimental Fact ◽  
Creep Recovery ◽  
Self Healing ◽  
Magnetorheological Elastomers ◽  
Practical Applications ◽  
Creep And Recovery ◽  
Sensing Material ◽  
Recovery Behavior

As a novel conductive elastomer, magnetorheological elastomers (MREs) featuring both high sensitivity and wide working range have been employed as a new sensing material for flexible tactile sensors. Their sensing mechanism, that is, the spatial distribution rearrangement of particles under compression, completely differs from their conventional counterparts. The piezo-capacitive effect of MREs resulting from the unique mechanism of particles rearrangement is actually a response to the microscopic mechanical movement of particles. This nature brings a core concern on the intrinsic relationship between their mechanical and electrical properties. This study illuminates them from the perspective of electrical creep and recovery behavior of MREs. We give a meaningful analysis for the capacitance creep-recovery mechanism. The experimental fact strongly demonstrated that the particles rearrangement was the direct cause, while the strain creep was an indirect cause. All the behaviors were well interpreted by an evolution mechanism of the particles rearrangement driven by the mechanical strain creep of the flexible matrix under constant pressure. In simpler terms, the electrical creep was induced by the mechanical creep. We further explored the creep effect in practical applications and found a “self-healing” behavior, which indicated that the MRE sensors could obtain a stable sensing capability after a pre-processing.

Whey protein gelation induced by enzymatic hydrolysis and heat treatment: Comparison of creep and recovery behavior

2017 ◽  
Vol 63 ◽  
pp. 696-704 ◽  
Author(s):  
Maria Julia Spotti ◽  
Özgür Tarhan ◽  
Sam Schaffter ◽  
Carlos Corvalan ◽  
Osvaldo H. Campanella
Keyword(s):  
Heat Treatment ◽  
Enzymatic Hydrolysis ◽  
Whey Protein ◽  
Treatment Comparison ◽  
Creep And Recovery ◽  
Protein Gelation ◽  
Recovery Behavior

Creep and recovery behavior of injection-molded isotactic polypropylene with controllable skin-core structure

2018 ◽  
Vol 69 ◽  
pp. 478-484 ◽  
Author(s):  
Xin Wang ◽  
Yamin Pan ◽  
Yijing Qin ◽  
Monika Voigt ◽  
Xianhu Liu ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Core Structure ◽  
Creep And Recovery ◽  
Recovery Behavior ◽  
Injection Molded
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