نتایج جستجو برای: 3d strain

تعداد نتایج: 403643  

Journal: :Journal of the Mechanics and Physics of Solids 2013

Journal: :Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance 2006
Alistair A Young Brent A French Zequan Yang Brett R Cowan Wesley D Gilson Stuart S Berr Christopher M Kramer Frederick H Epstein

We developed mathematical modeling tools for mapping 3D infarct geometry from multislice late gadolinium enhancement data, allowing fusion with multislice MR tagging data, in mice with myocardial infarction. Five C57BL/6 mice were imaged at baseline, 1, 7 and 28 days after 60 min occlusion of the left anterior descending coronary artery. The 3D infarct geometry was mapped in material coordinate...

Journal: :Optics and Laser Technology 2022

This paper deals with the use of Whispering Gallery Modes to measure six components an homogeneous strain tensor within a sphere undergoing uniform field. The device is silica in which WGMs resonate, describing circles positioned on sphere’s surface planes perpendicular normals dodecahedron. direct model relating resonant wavelength variation established for one circle and then linearised accor...

2010
S. Krishnamoorthi M. C. Gean

An alternative remeshing methodology for 3D Abaqus explicit analyses which utilizes mesh mapping is presented. Excessive element distortion in 3D large deformation analyses necessitates remeshing, however in Abaqus explicit, the standard 3D remeshing techniques limits the analyst’s choice of element type. The presented technique allows remeshing of 3D perfectly plastic fully integrated higher o...

Journal: :Ultrasound in Medicine and Biology 2021

The female pelvic floor (PF) muscles provide support to the organs. During delivery, some of these have stretch up three times their original length allow passage baby, leading frequently damage and consequently later-life PF dysfunction (PFD). Three-dimensional (3D) ultrasound (US) imaging can be used image diagnose by assessing quantitative, geometric functional information through strain ima...

2017
Azuma Takahashi Sara Suzuki Yusuke Aoyama Mitsuo Umezu Kiyotaka Iwasaki

BACKGROUND The mechanical interaction between blood vessels and medical devices can induce strains in these vessels. Measuring and understanding these strains is necessary to identify the causes of vascular complications. This study develops a method to measure the three-dimensional (3D) distribution of strain using tomographic particle image velocimetry (Tomo-PIV) and compares the measurement ...

2006
H. Shen L. C. Brinson

The porous microstructures of metallic foams cause microscopic stress and strain localization under deformation which reduces the damage tolerance and therefore limits application of the materials. In this paper, the deformation of a relatively low porosity porous titanium is examined using two-dimensional (2D) plane strain and three-dimensional (3D) finite element models to identify the accura...

Journal: :Ultramicroscopy 2014
Axel Lubk Elsa Javon Nikolay Cherkashin Shay Reboh Christophe Gatel Martin Hÿtch

Dark-field electron holography maps strain in crystal lattices into reconstructed phases over large fields of view. Here we investigate the details of the lattice strain-reconstructed phase relationship by applying dynamic scattering theory both analytically and numerically. We develop efficient analytic linear projection rules for 3D strain fields, facilitating a straight-forward calculation o...

2016
S. BEN ZEKRY G. LAWRIE S. LITTLE W. ZOGHBI J. FREEMAN A. JAJOO S. JAIN J. HE A. MARTYNENKO R. AZENCOTT

We present new algorithms to compute patient specific strain maps for mitral valve leaflets, by tracking and modeling deformations of the mitral valve apparatus in 3D echocardiography. We can then quantify comparisons of mitral leaflets strain maps between normal patients and cases of mitral valve prolapse or regurgitation. For patients with mitral valve regurgitation, we compare mitral leaflet...

Journal: :Journal of biomechanical engineering 2005
Trevor J Lujan Spencer P Lake Timothy A Plaizier Benjamin J Ellis Jeffrey A Weiss

The objective of this study was to assess the precision and accuracy of a nonproprietary, optical three-dimensional (3D) motion analysis system for the simultaneous measurement of soft tissue strains and joint kinematics. The system consisted of two high-resolution digital cameras and software for calculating the 3D coordinates of contrast markers. System precision was assessed by examining the...

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