Large deformation mechanics of a soft elastomeric layer under compressive loading for a MEMS tactile sensor application

Kalayeh, Kourosh; Charalambides, Panos G.

doi:10.1016/j.ijnonlinmec.2015.06.005

Cited by 10 publications

(20 citation statements)

References 37 publications

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“…Therefore, the sensor can manifest the applied loading as a change in capacitance between the electrodes and the change in capacitance can be used to identify the location, magnitude, and direction of the applied loads. An important premise of the above model is that the relatively stiffer conductive elastomer, during deformation, floats within the layer like a pair of stiff wires placed in a layer of soft jello [ 49 ].…”

Section: Summary Of the Finite Flat Punch Indentation Modelmentioning

confidence: 99%

“…As shown in the figure, a typical punch-sensor contact length is in the order of 20 mm while the largest distance between two electrodes in these sensors is in the order of 1.0 mm [ 48 ]. Therefore, as discussed in [ 49 ], the mechanics of the elastomeric layer in the vicinity of the symmetry plane i.e., the region of interest in the tactile sensor modeling, can be estimated by considering an infinitely long layer compressed uniformly (infinite layer-infinite punch assumption). The model for the above problem i.e., the uniform compression of a soft polymeric layer, has been solved analytically and was presented in [ 49 ].…”

Section: Summary Of the Finite Flat Punch Indentation Modelmentioning

confidence: 99%

“…Therefore, as discussed in [ 49 ], the mechanics of the elastomeric layer in the vicinity of the symmetry plane i.e., the region of interest in the tactile sensor modeling, can be estimated by considering an infinitely long layer compressed uniformly (infinite layer-infinite punch assumption). The model for the above problem i.e., the uniform compression of a soft polymeric layer, has been solved analytically and was presented in [ 49 ]. Although the model developed in [ 49 ] was then adopted in the development of a capacitive tactile sensor predictive model [ 31 ], several approximations were introduced, thus limiting the effectiveness of the developed model.…”

Section: Summary Of the Finite Flat Punch Indentation Modelmentioning

confidence: 99%

“…The model for the above problem i.e., the uniform compression of a soft polymeric layer, has been solved analytically and was presented in [ 49 ]. Although the model developed in [ 49 ] was then adopted in the development of a capacitive tactile sensor predictive model [ 31 ], several approximations were introduced, thus limiting the effectiveness of the developed model. A major limiting aspect is that, for contact force calculations, a corresponding infinite layer-finite punch formulation (i.e., finite flat punch indentation problem) is needed.…”

Section: Summary Of the Finite Flat Punch Indentation Modelmentioning

confidence: 99%

“…The purpose of the current study is to develop a large-deformation, large-strain model capable of predicting the response of the fabricated sensors under the application of normal forces covering their full sensing range. In doing so, a non-linear semi-analytical model developed for finite flat punch indentation of soft elastomeric layer in [ 49 , 50 ], will be integrated with an enhanced capacitance model. The empirical expression for change-in-capacitance is developed based on the parallel plate capacitance theory and through model comparisons to the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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A Non-Linear Model of an All-Elastomer, in-Plane, Capacitive, Tactile Sensor Under the Application of Normal Forces

Kalayeh

Charalambides

2018

Sensors

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In this work, a large deformation, non-linear semi-analytical model for an all-elastomer, capacitive tactile unit-sensor is developed. The model is capable of predicting the response of such sensors over their entire sensing range under the application of normal forces. In doing so the finite flat punch indentation model developed earlier is integrated with a capacitance model to predict the change-in-capacitance as a function of applied normal forces. The empirical change-in-capacitance expression, based on the parallel plate capacitance model, is developed to account for the fringe field and saturation effects. The elastomeric layer used as a substrate in these sensors is modeled as an incompressible, non-linear, hyperelastic material. More specifically, the two term Mooney-Rivlin strain energy function is used as a constitutive response to relate the stresses and strains. The developed model assumes both geometrical as well as material non-linearity. Based on the related experimental work presented elsewhere, the inverse analysis, combining finite element (FE) modeling and non-linear optimization, is used to obtain the Mooney-Rivlin material parameters. Finally, to validate the model developed herein the model predictions are compared to the experimental results obtained elsewhere for four different tactile sensors. Great agreements are found to exist between the two which shows the model capabilities in capturing the response of these sensors. The model and methodologies developed in this work, may also help advancing bio-material studies in the determination of biological tissue properties.

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Section: Summary Of the Finite Flat Punch Indentation Modelmentioning

confidence: 99%