Determination of Dynamic Material Properties of Silicone Rubber Using One-Point Measurements and Finite Element Simulations

Ilg, J.; Rupitsch, Stefan J.; Sutor, Alexander; Lerch, Reinhard

doi:10.1109/tim.2012.2203449

Cited by 30 publications

(37 citation statements)

References 34 publications

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“…Each of these studies required excised specimens, thus precluding in vivo application. The vibration transmission analyzer technique used in [33, 34] was demonstrated to yield the frequency-dependent material properties up to 400 Hz. However, this method could only be applied to the measurement of synthetic specimens with known geometry.…”

Section: Discussionmentioning

confidence: 99%

“…A rod resonance apparatus [31, 32] was used to measure the frequency-dependent Young’s modulus of viscoelastic materials. Furthermore, in [33, 34], the measurement with a so-called vibration transmission analyzer was demonstrated to estimate the frequency-dependent parameters of single-layer silicone samples used for vocal fold models with the aid of an inverse method [35, 36]. These methods provide dynamic information, but require homogeneous specimens of known geometry; consequently, not all types of real tissue can be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Pipette aspiration applied to the characterization of nonhomogeneous, transversely isotropic materials used for vocal fold modeling

Weiß

Thomson

Lerch

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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The etiology and treatment of voice disorders are still not completely understood. Since the vibratory characteristics of vocal folds are strongly influenced by both anatomy and mechanical material properties, measurement methods to analyze the material behavior of vocal fold tissue are required. Due to the limited life time of real tissue in the laboratory, synthetic models are often used to study vocal fold vibrations. In this paper we focus on two topics related to synthetic and real vocal fold materials. First, because certain tissues within the human vocal folds are transversely isotropic, a fabrication process for introducing this characteristic in commonly-used vocal fold modeling materials is presented. Second, the pipette aspiration technique is applied to the characterization of these materials. By measuring the displacement profiles of stretched specimens that exhibit varying degrees of transverse isotropy, it is shown that local anisotropy can be quantified using a parameter describing the deviation from an axisymmetric profile. The potential for this technique to characterize homogeneous, anisotropic materials, including soft biological tissues such as those found in the human vocal folds, is supplemented by a computational study.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pipette aspiration applied to the characterization of nonhomogeneous, transversely isotropic materials used for vocal fold modeling

Weiß

Thomson

Lerch

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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“…These values are in the range of those for which Zhang, Neubauer, and Berry [15] observed oscillations driven by aerodynamic forces. These Young's moduli were determined with a hybrid experimental-numerical technique described in the papers of Rupitsch et al [29] and Ilg et al [30]. The geometry of the vocal folds shown in Figure 4 was chosen to closely approximate the model developed by Thomson The supraglottal channel with a variable lateral displacement D is shown [17] in Figure 5.…”

Section: Larynx Model and Measuring Setupmentioning

confidence: 99%

Geometry of the Vocal Tract and Properties of Phonation near Threshold: Calculations and Measurements

et al. 2019

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In voice research, analytically-based models are efficient tools to investigate the basic physical mechanisms of phonation. Calculations based on lumped element models describe the effects of the air in the vocal tract upon threshold pressure (Pth) by its inertance. The latter depends on the geometrical boundary conditions prescribed by the vocal tract length (directly) and its cross-sectional area (inversely). Using Titze’s surface wave model (SWM) to account for the properties of the vocal folds, the influence of the vocal tract inertia is examined by two sets of calculations in combination with experiments that apply silicone-based vocal folds. In the first set, a vocal tract is constructed whose cross-sectional area is adjustable from 2.7 cm2 to 11.7 cm2. In the second set, the length of the vocal tract is varied from 4.0 cm to 59.0 cm. For both sets, the pressure and frequency data are collected and compared with calculations based on the SWM. In most cases, the measurements support the calculations; hence, the model is suited to describe and predict basic mechanisms of phonation and the inertial effects caused by a vocal tract.

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“…FEM techniques have been widely employed in numerous elastography studies and more recently in OCE (Kennedy et al , 2013), (Ilg et al , 2012; Chin et al , 2014). Using FEM, the impact of variations in boundary conditions, sample geometries, and mechanical properties can be conveniently investigated.…”

Section: Methodsmentioning

confidence: 99%

Mechanical contrast in spectroscopic magnetomotive optical coherence elastography

et al. 2015

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The viscoelastic properties of tissues are altered during pathogenesis of numerous diseases and can therefore be a useful indicator of disease status and progression. Several elastography studies have utilized the mechanical frequency response and the resonance frequencies of tissue samples to characterize their mechanical properties. However, using the resonance frequency as a source of mechanical contrast in heterogeneous samples is complicated because it not only depends on the viscoelastic properties but also on the geometry and boundary conditions. In an elastography technique called magnetomotive optical coherence elastography (MM-OCE), the controlled movement of magnetic nanoparticles (MNPs) within the sample is used to obtain the mechanical properties. Previous demonstrations of MM-OCE have typically used point measurements in elastically homogeneous samples assuming a uniform concentration of MNPs. In this study, we evaluate the feasibility of generating MM-OCE elastograms in heterogeneous samples based on a spectroscopic approach which involves measuring the magnetomotive response at different excitation frequencies. Biological tissues and tissue-mimicking phantoms with two elastically distinct regions placed in side-by-side and bilayer configurations were used for the experiments, and finite element method (FEM) simulations were used to validate the experimental results.

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Determination of Dynamic Material Properties of Silicone Rubber Using One-Point Measurements and Finite Element Simulations

Cited by 30 publications

References 34 publications

Pipette aspiration applied to the characterization of nonhomogeneous, transversely isotropic materials used for vocal fold modeling

Pipette aspiration applied to the characterization of nonhomogeneous, transversely isotropic materials used for vocal fold modeling

Geometry of the Vocal Tract and Properties of Phonation near Threshold: Calculations and Measurements

Mechanical contrast in spectroscopic magnetomotive optical coherence elastography

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