Viscoelastic measurement techniques

Lakes, Roderic S.

doi:10.1063/1.1651639

Cited by 171 publications

(87 citation statements)

References 59 publications

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“…The harmonic magnetic potential used in this work is an example among different alternatives, yet very relevant because of the importance of harmonic oscillators in scientific measurements. Investigation of the dissipative forces through the oscillating magnetic droplets produced high-precision quantitative results, as could be expected for oscillatory measurements 33 . Our method not only allows to compare the performances of different superhydrophobic coatings, but also makes it possible to study even the local inhomogeneities and to establish scaling laws between dissipation and normal force.…”

Section: Discussionmentioning

confidence: 75%

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Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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The recently demonstrated extremely water-repellent surfaces with contact angles close to 180°with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of B10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet-solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.

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Section: Discussionmentioning

confidence: 75%

“…On a general level, oscillatory concepts are often preferred in measurement technologies 33 . They are especially suitable for studying systems with minimal energy dissipation, for example through gradually decaying free oscillations or through the linewidths of externally driven resonance peaks.…”

mentioning

confidence: 99%

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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“…Leung and Yu (2008) developed a mini-Split Hopkinson tensile bar and tested the plastic behavior under strain-rate 100-1000 (1/s), but it was not accurate enough to obtain the dynamic modulus of the material. For the measurement of linear visco-elastic parameters of polymer materials, DMA (i.e., dynamic mechanical analysis) method is usually applied (Lakes, 2004). However, considering the contact duration of the ball is less than 1ms and the samples are too small, it is quite difficult to obtain its visco-elastic parameters in this time scale by means of conventional measurements.…”

Section: Impact Tests Of the Ping-pong Ballsmentioning

confidence: 99%

Dynamic behaviors of visco-elastic thin-walled spherical shells impact onto a rigid plate

Zhang

2014

Lat. Am. j. solids struct.

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As a representative structure, ping-pong balls are usually used to study the mechanical properties of thin-walled spherical shells. In a previous study, the dynamic behaviors of ping-pong balls impinged onto a rigid plate were investigated. It was found that the dynamic deformation energy of the balls could be several times higher than that under quasi-static compression, which could not be completely explained by elastic-plastic material property, strain-rate and inertial effects. In this paper, more impact tests were conducted and the details including the contact time, deformation and rebound behaviors with different impact velocities were reinvestigated. Based on the experimental results, visco-elastic material model is applied and the numerical simulation of thin-walled spherical shells impact onto a plate is performed, in which the influences of the visco-elastic parameters and the impact velocity on the dynamic behaviors are studied. By adjusting the visco-elastic parameters, the contact time, deformation, and the coefficient of restitution agree well with the experimental results. Keywords Impact; visco-elastic; coefficient of restitution; spherical shell.Dynamic behaviors of visco-elastic thin-walled spherical shells impact onto a rigid plate INTRODUCTIONDue to high load-carrying efficiency and good aerodynamic properties, thin-walled spherical shells are extensively applied not only in engineering structures, but also for sports facilities, such as aircraft, submarine, pressure vessels, oil containers, footballs, tennis balls and so on. Considering loading conditions, their large deformation and buckling behaviors compressed against a rigid plate attract great attentions of researchers.In earlier decades, theoretical and experimental studies about the deformation modes and contact force of elastic and rigid-plastic spherical shells have been done by Updike and Kalnins (1970;1972), Kitching et al (1975), De Olivera andWierzbicki (1982), Gupta et al (1999), most of which focused on the quasi-static cases and the dynamic effects were not considered. To examine the ener- gy absorption of metal hollow sphere (MHS) materials, Ruan et al (2006) investigated the dynamic crushing of 1D and 2D ping-pong ball arrays under in-plane impacts and found that a single ball's load-deformation relation can be used to predict the ball-array's load deformation behavior. Hubbard and Stronge (2001) conducted the impact tests for ping-pong balls onto a flat plate with velocity 0-20m/s, and obtained the contact time and coefficient of restitution. However, in their analytical modeling, they considered the balls to be pure elastic. As a result, the predictions for the contact time and coefficient of restitution were both higher than the experiments, while the predicted energy dissipation was too little. Besides, Stronge and Achsoft (2007), and Arakawa et al (2007Arakawa et al ( , 2009) studied the impact behaviors of basketballs and golf balls, respectively. Bao and Yu (2012) conducted numerical simulations about the dy...

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“…A material under an applied stress deforms with a combined behaviour of an elastic solid and a viscous flow. Thus, in viscoelastic materials, the stress-strain relationship depends on time or frequency [Lake, 2004]. Viscoelastic behaviour is also related with materials that have a glass transition temperature similar to thermopolymers such as PMMA.…”

Section: Nanoindentation Testingmentioning

confidence: 99%

Elastic and Nanowearing Properties of SiO2-PMMA and Hybrid Coatings Evaluated by Atomic Force Acoustic Microscopy and Nanoindentation"

Alvarado-Rivera¹,

Muñoz-Saldaña²,

Ramı́rez-Bon³

2012

Scanning Probe Microscopy-Physical Property Characterization at Nanoscale

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Viscoelastic measurement techniques

Cited by 171 publications

References 59 publications

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Dynamic behaviors of visco-elastic thin-walled spherical shells impact onto a rigid plate

Elastic and Nanowearing Properties of SiO2-PMMA and Hybrid Coatings Evaluated by Atomic Force Acoustic Microscopy and Nanoindentation"

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