Nonlinear Elasticity Background

Dorfmann, Luis; Ogden, Ray W.

doi:10.1007/978-1-4614-9596-3_3

Cited by 2 publications

(4 citation statements)

References 12 publications

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“…A so-called hyperelastic material (or in the literature often called a Green-elastic material) postulates the existence of a Helmholtz free-energy function , which is defined per unit reference volume than per unit mass. [35][36][37][38][39][40][41] For the case in which = (F) is solely a function of F or some strain tensor, the Helmholtz free-energy function is referred to as the strain-energy function or stored energy function. We now restrict attention to homogeneous materials in which the distributions of the internal constituents are assumed to be uniform on the continuum scale.…”

Section: Hyperelastic Materialsmentioning

confidence: 99%

“…A very sophisticated development for simulating incompressible (rubber-like) materials in the phenomenological context is due to Ogden. 36,37 The postulated strain energy is a function of the principal stretches λ a , a = 1, 2, 3, which is computationally simple and plays a crucial role in the theory of finite elasticity. It describes the changes of the principal stretches from the reference to the current configuration and has the form…”

Section: Extension and Compression Of A Rodmentioning

confidence: 99%

“…When the opposing sides of the inflated circular diaphragm dielectric elastomer generator are subjected to a differential pressure, p, and to an electric potential difference, V, it undergoes an out-of-plane axial-symmetric (bubble-like) deformation (area expansion). Dorfmann and Ogden 37 propose a solution for an extension and inflation of a thick-walled tube which is more related to our application.…”

Section: Inflation Of a Spherical Balloonmentioning

confidence: 99%

“…Previous works have shown that polymers like those used to build the soft membrane in SUAS can be treated as incompressible hyperelastic materials. [36][37][38][39][40] Using well-established formalisms of continuum mechanics, the deformation of the membrane is described by a "deformation function", χ, which maps each point of the continuum, X, in the reference undeformed configuration to a corresponding point, x, in the actual deformed configuration:…”

Section: Hyperelastic Membrane Modelmentioning

confidence: 99%

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SUAS: A Novel Soft Underwater Artificial Skin with Capacitive Transducers and Hyperelastic Membrane

Muscolo

Moretti²,

Cannata³

2018

Robotica

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The paper presents physical modeling, design, simulations, and experimentation on a novel Soft Underwater Artificial Skin (SUAS) used as tactile sensor. The SUAS functions as an electrostatic capacitive sensor, and it is composed of a hyperelastic membrane used as external cover and oil inside it used to compensate the marine pressure. Simulation has been performed studying and modeling the behavior of the external interface of the SUAS in contact with external concentrated loads in marine environment. Experiments on the external and internal components of the SUAS have been done using two different conductive layers in oil. A first prototype has been realized using a 3D printer. The results of the paper underline how the soft materials permit better adhesion of the conductive layer to the transducers of the SUAS obtaining higher capacitance. The results here presented confirmed the first hypotheses presented in a last work and opened new ways in the large-scale underwater tactile sensor design and development. The investigations are performed in collaboration with a national Italian project named MARIS, regarding the possible extension to the underwater field of the technologies developed within the European project ROBOSKIN.

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Section: Hyperelastic Materialsmentioning

confidence: 99%

Section: Extension and Compression Of A Rodmentioning

confidence: 99%

Section: Inflation Of a Spherical Balloonmentioning

confidence: 99%

Section: Hyperelastic Membrane Modelmentioning

confidence: 99%

See 2 more Smart Citations

SUAS: A Novel Soft Underwater Artificial Skin with Capacitive Transducers and Hyperelastic Membrane

Muscolo

Moretti²,

Cannata³

2018

Robotica

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A new class of variable capacitance generators based on the dielectric fluid transducer

Duranti

Righi

Vertechy

et al. 2017

Smart Mater. Struct.

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This paper introduces the novel concept of dielectric fluid transducer (DFT), which is an electrostatic variable capacitance transducer made by compliant electrodes, solid dielectrics and a dielectric fluid with variable volume and/or shape. The DFT can be employed in actuator mode and generator mode. In this work, DFTs are studied as electromechanical generators able to convert oscillating mechanical energy into direct current electricity. Beside illustrating the working principle of dielectric fluid generators (DFGs), we introduce different architectural implementations and provide considerations on limitations and best practices for their design. Additionally, the proposed concept is demonstrated in a preliminary experimental test campaign conducted on a first DFG prototype. During experimental tests a maximum energy per cycle of and maximum power of has been converted, with a conversion efficiency up to 30%. These figures correspond to converted energy densities of with respect to the displaced dielectric fluid and with respect to the mass of the solid dielectric. This promising performance can be largely improved through the optimization of device topology and dimensions, as well as by the adoption of more performing conductive and dielectric materials.

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Nonlinear Elasticity Background

Cited by 2 publications

References 12 publications

SUAS: A Novel Soft Underwater Artificial Skin with Capacitive Transducers and Hyperelastic Membrane

SUAS: A Novel Soft Underwater Artificial Skin with Capacitive Transducers and Hyperelastic Membrane

A new class of variable capacitance generators based on the dielectric fluid transducer

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