Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 68 for “"transversely isotropic"”.
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Strength of transversely isotropic rocks
This thesis proposes a new Anisotropic Matsuoka-Nakai (AMN) criterion to characterize the failure of transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three …
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Borehole Breakouts in Transversely Isotropic Posidonia Shale
… for conventional triaxial loading conditions in isotropic rocks (Dresen et al., 2010) has been successfully extended to true triaxial loading conditions in the transverse isotropic rock to predict the initiation of borehole breakouts. The criterion was successfully verified on the experiments …
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Boundary-value problems for transversely isotropic hyperelastic solids
… of dead-load tractions in respect of transersely isotropic elastic materials. In particular, Chapter 1 mainly consists of existing preliminary remarks on the continuum (phenomenological) approach used here to study the mechanical response of elastic materials under large strains. More …
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A virtual element method for transversely isotropic elasticity
… the approximation of plane problems concerning transversely isotropic elasticity, using a low-order virtual element method (VEM). The VEM is an alternative finite element method characterised by complete freedom in determining element geometries that are otherwise polygonal in two dimensions, or …
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In-plane vibrations of a transversely isotropic arch
A model for the dynamic response of a laminated composite arch is developed from classical shell theory. The problem is reduced from a shell to an arch by making an assumption that the variation of the field of variables in the direction of the width of the arch is small compared to those in other …
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Propagation of fluid driven fractures in transversely isotropic material
… the mechanics of hydraulic fractures (HF) in isotropic media is well established, the impact of the anisotropy of natural rocks on HF propagation is still far from being understood. Sedimentary rocks like shales and mudstones are ubiquitous in upper earth crust which are made of fine layers …
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Experimental investigation of Lamb waves in transversely isotropic composite plates
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Wave propagation along a cylindrical borehole in a transversely isotropic medium
Includes bibliographical references (pages 214-218).
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Transient response of an acoustic logging tool in transversely isotropic media
Includes bibliographical references.
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Identification of Transversely Isotropic Material Properties from Cardiac Magnetic Resonance Elastography
… elastography (MRE) has been used to estimate isotropic stiffness in the heart, myocardium has anisotropic material properties with greatest stiffness along the fibre direction. This thesis investigated two methods for determining global transversely isotropic material properties from MRE …
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Dynamic simulation of heart mitral valve with transversely isotropic material model
This thesis develops two methods for simulating, in the finite element setting, the material behavior of heart mitral valve leaflet tissue. First, a mixed pressure-displacement formulation is used to implement the constitutive material behavior with general 3D elements. Second, a shell is …
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Optimal Blast-Resistant Sandwich Structures with Transversely Isotropic, Elasto-plastic Polymeric Foams as Cores
… Unlike metallic foams polymeric foams exhibit transversely isotropic response when tested in a laboratory setting. More specifically, they exhibit different hardening along the foam thickness than that in a direction transverse to the thickness. Furthermore, polymeric foams harden differently …
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Stress Interference in Axisymmetric Torsion of a Transversely Isotropic Body (Elasticity, Solid Mechanics, Anisotropic, Stress Concentration)
An unbounded transversely isotropic body of revolution containing two spheroidal cavities is subjected to torsion about its axis of elastic symmetry, which coincides with its axis of revolution. At large distances from the cavities the elastic field approaches the Saint-Venant solution for the …
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Convergent finite element approximations for problems of near-incompressible and near-inextensible transversely isotropic linear elasticity
… study of the boundary value problem for transversely isotropic linear elastic bodies. The main objective is the development and implementation of low-order finite element methods that are uniformly convergent in the incompressible and inextensible limits. The first step in the …
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Elastic wave propagation in homogeneous transversely isotropic medium with symmetry axis parallel to the free surface.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Effect of fiber morphology on composite properties
… purely orthotropic fibers. For fibers with a transversely isotropic core both the size of the core and the morphology of the sheath were found to have an effect on the composite properties. The stress states resulting in the composite cylinder for axial, radial, axial shear, and thermal loads …
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A virtual element method for hyperelasticity
… which must be approximated. Problems concerning isotropic and transversely isotropic hyperelastic material models are considered. Examples of transversely isotropic materials, which are characterised by an axis of symmetry normal to a plane of isotropy, range from simple fibre-reinforced …
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Methods to improve indentation results on soft materials and anisotropic biological tissues
… The MIA is experimentally validated on isotropic polyacrylamide gel with load-unload cycles in indentation. Furthermore, it is applied to accurate characterization of poroelastic properties and allows for the use of much smaller probes and indentation depths for all measurements. This …
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Analysis of Plane Strain Deformations of Linearly Elastic Strain-Gradient Materials by the Finite Element Method
… analyze plane strain deformations of a clamped, transversely isotropic beam. The obtained stresses and displacements compare well with the analytical solutions available in the literature, thus verifying the numerical solution. The Method of Manufactured solutions (MMS) was used to further verify …
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On vibration and stability problems of laminated plates and shells using shear deformation theories
… problems of rectangular plates laminated of transversely isotropic layers. The pure—shear frequencies of the plate in linear and nonlinear problems are identified from the edge—zone equation. For certain boundary conditions the original system of equations are reduced to three in number, as …
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