Results 1  10
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211
MR Diffusion Tensor Spectroscopy and Imaging
, 1994
"... This paper describes a new NMR imaging modalityMR diffusion tensor imaging. It consists of estimating an effective diffusion tensor, Deff, within a voxel, and then displaying useful quantities derived from it. We show how the phenomenon of anisotropic diffusion of water (or metabolites) in anisotro ..."
Abstract

Cited by 384 (11 self)
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with the eigenvectors of D"f}, while the effective diffusivities along these orthotropic directions are the eigenvalues of De"f. Diffusion ellipsoids, constructed in each voxel from Deff, depict both these orthotropic axes and the mean diffusion distances in these directions. Moreover, the three scalar
COMMENT ON ORTHOTROPIC MODELS FOR CONCRETE AND GEOMATERIALS
"... ABSTRACT: Incrementally linear constitutive equations that are characterized by a ~ orthotrop~c t~n~ential stiffness or. compliance matrix have recently become widely used m fimte element analYSIS of concrete structures and soils. It does not seem to be, however, widely appreciated that such constit ..."
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that such constitutive equations are limited to loading histories in which the prinicipal stress directions do not rotate, and that a violation of this condition can sometimes have serious consequences. It is demonstrated that in such a case the orthotropic models do not s.a~isfy the forminvariance condition
.530 Shear Coefficients for Orthotropic Beams
, 1973
"... Because of their high stiffnesstoweight ratios, fiber reinforced composites are being studied for use in weightcritical compression members. Davis [1] pointed out that unidirectional or nearly unidirectional composites typically have a low transverse shear stiffness and the calculation of the cri ..."
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/±6/90] family. Therefore, the present derivation which is for homogeneous orthotropic materials is applicable for most composite columns and should be employed in the calculation of critical column loads. The beam under consideration has its axis in the zdirection, is straight and uniform, and the cross
Orientation and formability of orthotropic sheet metals
"... Abstract: This paper examines the formability of automotive sheet metals: CR steels and 6000 series aluminium–magnesium alloys. Necking strains are used to determine the forming limits; i.e. a diffuse instability condition is reached under inplane biaxial stressing. The theory admits material aniso ..."
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anisotropy, workhardening and sheet orientation under any ratio of applied principal stresses. It has been programmed to accept orientations between the principal stress axes and the sheets ’ rolling direction in 15 increments between 0 and 90 . The ratio between the principal stresses may vary between 0
Harmonic Waves with Arbitrary Propagation Direction in Layered Orthotropic Elastic Composites
, 1981
"... The dispersion of harmonic waves propagating in an arbitrary direction in a layered orthotropic elastic composite is studied. The full threedimensional field equations of elasticity are considered, and the corresponding twelfth order characteristic determinant is examined. Numerical results are obt ..."
Abstract

Cited by 1 (0 self)
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The dispersion of harmonic waves propagating in an arbitrary direction in a layered orthotropic elastic composite is studied. The full threedimensional field equations of elasticity are considered, and the corresponding twelfth order characteristic determinant is examined. Numerical results
Short Title: Orthotropic Intramural Spread of LV Activation
"... Three distinct directions of intramural activation reveal nonuniform ..."
LAMB WAVE MODES PROPAGATING ALONG ARBITRARY DIRECTIONS IN AN ORTHOTROPIC PLATE
"... The recent interests [15] on the Lamb wave study of orthotropic sheet materials have been motivated by nondestructive evaluation (NDE) and characterization of the fiber composite plate. The dispersive properties of Lamb waves in an isotropic plate have been well known since the original work of Lam ..."
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The recent interests [15] on the Lamb wave study of orthotropic sheet materials have been motivated by nondestructive evaluation (NDE) and characterization of the fiber composite plate. The dispersive properties of Lamb waves in an isotropic plate have been well known since the original work
ON THE DIRECT BEM FORMULATION IN THE DUAL SYSTEM OF PLANE ELASTICITY FOR ORTHOTROPIC BODIES
"... ABSTRACT. The paper is devoted to plane problems of orthotropic bodies in a dual formulation. After presenting the governing equations in terms of stress functions of order one, we determine the two fundamental solutions and set up the dual Somigliana relations both for inner and exterior regions. T ..."
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ABSTRACT. The paper is devoted to plane problems of orthotropic bodies in a dual formulation. After presenting the governing equations in terms of stress functions of order one, we determine the two fundamental solutions and set up the dual Somigliana relations both for inner and exterior regions
Waves propagation in an arbitrary direction in heat conducting orthotropic elastic composites
, 2013
"... Summary. Dispersion of thermoelastic harmonic waves propagating in an arbitrary direction in a layered heat conducting orthotropic elastic composite in the context of generalized thermoelasticity is studied. Considering three dimensional field equations of thermoelasticity and to obtain characteris ..."
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Summary. Dispersion of thermoelastic harmonic waves propagating in an arbitrary direction in a layered heat conducting orthotropic elastic composite in the context of generalized thermoelasticity is studied. Considering three dimensional field equations of thermoelasticity and to obtain
Optimizing Fiber Direction in Perforated Orthotropic Media to Reduce Stress Concentration
"... ABSTRACT: Structures often consist of composite members containing holes or notches. Since stress concentrations associated with such geometric discontinuities can decrease strength, there is desire to minimize stress concentrations. This article demonstrates ability to reduce tensile stress concent ..."
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concentrations in perforated composites by synergizing a finiteelement program with a feasibledirection method to optimize fiber directions locally, i.e., form a functionally graded material. Optimization is conducted under constraints on the maximum stress in the structure. In addition to reducing the tensile
Results 1  10
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211