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Showing 1 to 20 of 25 for “"hyperelastic material"”.
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On deformations of compressible hyperelastic material
… of compressible isotropic, nonlinear hyperelastic materials, specifically azimuthal shear of a thick-walled circular cylindrical tube, the bending deformation of a rectangular block and axial shear of a thick-walled circular cylindrical tube. For each problem the equilibrium equations …
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Reduced-Order Modeling and Design Optimization of Thermomechanical Shape Memory Alloy-Based Bistable Microactuators and Hyperelastic Material Systems
… computational approaches for modeling complex material behavior, focusing on shape memory alloys (SMAs) and hyperelastic materials. The goal is to improve both prediction accuracy and computational efficiency in simulations used for designing advanced materials and bistable microactuators. The …
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Development of a vibration fatigue failure prediction model for automotive lamps made of polymers
… are composed of different parts made of polymer materials. Polymers exhibit hyperelastic behaviour and they also exhibit inter-sample variation due to manufacturing processes. Some of the material properties required for dynamic and fatigue life analysis are not readily available. The key to …
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Development of a patient-specific finite element model of the transcatheter aortic valve implantation (TAVI) procedure
… (MSCT) images of the patients. An anisotropic hyperelastic material model was implemented for the roots and leaflets, using two and one families of collagen fibres for their tissues respectively. The stent is made of a cobalt-chromium alloy and its mechanical response was modelled as an …
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Biomechanical properties of engineered collagen scaffolds
… compared to 7,265% for crosslinked scaffolds. Hyperelastic material parameters were determined by the Arruda-Boyce eight-chain model, which was fit to the experimental data. This model predicted an average number of rigid links per collagen fiber of 1.3 and 1.21 for crosslinked and …
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Design of a morphing airfoil exhibiting bi-stability using topology optimization
… optimization has been used to distribute material over the design domain and to tailor the nonlinear response of the baseline structure to achieve the desired bi-stable behavior. The large scale deformation undergone by the structure is modeled using a hyperelastic material model. The …
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A Single-Stage Passive Vibration Isolation System for Scanning Tunneling Microscopy
… tunneling effect to study the surfaces of materials on an atomic scale. Since the probe of the microscope is on the order of nanometers away from the surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive …
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Finite Element Modelling and Experimental Characterisation of Auricle Mechanics for Earable Design
… tissue behaviour of the auricle was captured by hyperelastic material model, while parametric studies demonstrated the influence of geometry, material parameters, and boundary constraints on auricle response. Finally, prototype earable devices were simulated and tested to assess contact pressure, …
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Biological tissue mechanics with fibres modelled as one dimensional Cosserat continua: applications to cardiac tissue in healthy and diseased states
… do not elucidate on the complex heterogeneous material composition of cardiac tissue characterized by different fibre hierarchies interwoven by collagen, elastin and coronary capillaries [61, 115]. Thus, pathological changes of microstructural constituents, e.g. with regards to the extra …
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Non-linear finite element analyses of the aortic heart valve
… with mechanical stimuli. To study how non-linear material behaviour affects the results of stress analyses of the aortic valve, static finite element analyses of the valve including the aortic root and leaflets have been carried out. An isotropic linear elastic material model was assigned to the …
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Material modeling and sensor characterization for optimizing footpad force sensing array
… were tested by applying displacements to the material. The experimental force and voltage from the pressure sensor were recorded. The thesis aims to provide a Finite Element Analysis (FEA) model in Abaqus that accurately simulates and models the footpad sensors and is validated by the physical …
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An Optimal Control Approach to Implant Shape Design : Modeling, Analysis and Numerics
… of realistic models. This includes recent material laws for different soft tissue types as well as complex geometries attained from medical image data. The implant shape design problem can be described as an optimal control problem with constraints given by the necessary optimality …
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Development of a multi-physics tire model for wear and thermal estimation in the finite element environment
… modeling. The tire model incorporates hyperelastic material modeling and viscoelastic material modeling following the ASTM D412 standard. The materials are mostly composed using the Ogden material definition for the tire components: tread rubber, sidewall, and ply layers. To validate …
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A virtual element method for hyperelasticity
… studies the approximation of plane problems of hyperelasticity, using a loworder virtual element method (VEM). The VEM is an extension of the finite element method (FEM). It is characterised by considerable freedom with regard to element geometry, permitting arbitrary polygonal and polyhedral …
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An investigation into stent expansion using numerical and experimental techniques
… Sylgard elastomer 184 (Dow Corning). This material was chosen mainly due to its inherent variable elastic properties which are determined by its curing process and ratio of elastomer to curing agent. Extensive testing was carried out on samples of porcine coronary arteries and differing …
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Experimental and Numerical Modelling of Gasket Materials and Property Correlation
… to study the shore hardness testing of rubber materials principally used for gasket applications. The correlation between shore hardness and linear elastic and hyperelastic properties has been systematically investigated. A detailed FE model of the shore A hardness test has been developed with …
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Tissue Diagnosis Probe Based on Stiffness Measurement Using Vision and Force Sensing Modalities
… prostate was modelled as a nonlinear hyperelastic material (utilizing Arruda-Boyce model) inthe finite element modelling software package, ABAQUS 6.8-1. The results indicated that the proposed model can estimate the mechanical properties ofthe ex-vivo human prostate effectively. With …
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Microstructural non-linear finite-element analysis of rat myocardium with hydrogel biomaterial inclusions
Hydrogel biomaterial injectate therapies have emerged as a promising treatment modality for myocardial infarction (MI). Studies conducted on small and large animal models have yielded positive results in improving cardiac function and reducing adverse ventricular remodelling post-MI. These …
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Essential techniques for improving visual realism of laparoscopic surgery simulation.
… simulation based on uniform polynomial based hyperelastic material representation. For interaction, a collision detection and interaction system based on adaptive circumphere structure is proposed which supports robust and efficient sliding con- tact, energized dissection and clip. For …
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Nonlinear Viscoelastic Wave Propagation in Brain Tissue
… and C_11) are needed to accurately capture the material behavior. Furthermore, for the volumetric deformation, a linear bulk modulus model was used and the extent of material incompressibility was studied. The hyperelastic material parameters were determined through extracting and fitting to two …
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