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 71 for “"Displacement Field"”.
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Identification of singularities in the displacement field for damage detection in structures
… problem in beam-type structures through displacement field and the relevant challenges are studied. The exploration includes one damage localization approach using mode shapes and two damage identification methodologies based on static meas-urements. The premise is that concentrated …
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Η ΕΦΑΡΜΟΓΗ ΤΗΣ ΣΥΜΜΟΡΦΟΥ ΑΠΕΙΚΟΝΙΣΕΩΣ ΣΤΑ ΠΕΠΕΡΑΣΜΕΝΑ ΣΤΟΙΧΕΙΑ ΓΙΑ ΤΗΝ ΕΠΙΛΥΣΗ ΠΡΟΒΛΗΜΑΤΩΝ ΡΩΓΜΩΝ
USING A CONFORMAL MAPPING, THE SINGULAR STRESS FIELD AROUND CRACK TIPS IS TRANSFORMED TO A REGULAR ONE WITH RESPECT TO THE NEW VARIABLES. THUS, THE DISPLACEMENT FIELD IS APPROXIMATED IN THE MAPPED PLANE. THE INVERSE MAPPING GIVES SHAPE FUNCTIONS WHICH ARE NOT POLYNOMIALS. THE STRAIN FIELD, OBTAINED …
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Development of a Virtually Calibrated Projection Moire Interferometry Technique Capable of Inaccessible Surface Measurements
… techniques have found merit in measuring displacement and strain for decades. These techniques are commonly used in numerous applications ranging from large displacements in wind tunnel experiments to displacement measurements on the submicron scale. Projection Moiré Interferometry (PMI) …
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Hierarchical modeling of laminated composite plates using variable kinematic finite elements and mesh superposition
A hierarchical, 2-D, displacement-based, global/local finite element model is developed to permit an accurate, efficient analysis of localized 3-D effects in laminated composite plates. The model is developed using hierarchical, multiple assumed displacement fields at two different levels: (1) at …
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Polygonal finite elements for finite elasticity
… theoretical framework of deriving the two-field variational principle, involving a displacement field and a pressure field, is presented. Within the theoretical framework, by assuming different forms of stored-energy function, two types of variational principles are obtained, each with …
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Shear Behavior and Capacity of Large Scale Prestressed High Strength Concrete Bulb -Tee Girders
… test results, an analytical model, Crack Displacement Field Theory (CDFT), was developed for predicting the shear response of prestressed/reinforced concrete members. Compared to other existing models, it could capture the discrete displacement due to crack opening and crack slip along …
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Atomistics of defect nucleation and mobility : dislocations and twinning
… have been derived to (1) calculate the atomic displacement field under PBC and generate atomic dislocation configuration from this displacement field; (2) quantify artificial image effect for a dislocation moving within the periodic cell and optimize geometry of simulation cell to minimize such …
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Interactive Buckling and Post-Buckling Studies of Thin-Walled Structural Members with Generalized Beam Theory
… buckling mode decomposition method of normalized displacement field, bending stresses and strain energy for thin-walled member displacement field (point clouds or finite element results) based on generalized beam theory (GBT). The method provides quantitative modal participation information …
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Compact representations for fast nonrigid registration of medical images
… we create a tetrahedral representation of a displacement field that automatically adapts to both the anatomy in an image and to the displacement field. The resulting algorithm has a computational cost that is dominated by the number of nodes in the mesh (about 10,000), rather than the number …
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Analysis of trabecular bone mechanical properties from magnetic resonance images
… properties. The apparent elastic modulus and the displacement field were assessed and compared to a high resolution MR model. The effect of image voxel size on these properties was examined using μMR images acquired with different resolutions. The estimated mechanical properties of two trabecular …
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Spectral Element Analysis of Bars, Beams, and Levy Plates
… The development includes the governing PDE, displacement field, shape function, and dynamic stiffness matrix. A two DOF spectral Love bar element and both a four DOF spectral Euler-Bernoulli and a four DOF spectral Timoshenko beam element are also developed to gain insight into the …
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Layerwise theory for discretely stiffened laminated cylindrical shells
… problem by expanding the three-dimensional displacement field as a function of a surface-wise two-dimensional displacement field and a one-dimensional interpolation through the shell thickness. Any required degree of accuracy can be obtained by an appropriate, independent selection of the …
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Elementos finitos Taylorianos
… makes use of the Taylor series to represent the displacement field, is presented. This way the interpolation functions for a domain in the periphery of the origin of the expansion in series are defined in respect to some points in the periphery of that origin. The form of the element can be …
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Nonlinear analysis of free-edge effects in laminated composites under axial loading
… model based on the quasi-three dimensional displacement field of Pipes and Pagano [1] with nonlinear strain-displacement relations is developed to study the free edge problem of composite laminates. Numerical results are presented to show the difference between the results of the nonlinear …
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Fracture of a Model Functionally Graded Material Manufactured From a Photo-Sensitive Polyethylene
… gradient direction, or both. A hybrid full-field digital image correlation technique was used to measure in real-time the displacement field around the crack tip while it propagated through the graded material. The measured displacement field was then used to extract fracture parameters KI, …
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Refined theories and Discontinuous Galerkin methods for the analysis of multilayered composite structures
… is the accurate prediction of the stress field; it can be obtained employing several numerical methods that can provide very detailed results at an high computational cost. This approach is well suited for small parts but cannot be applied to complex structures or for damage-tolerance …
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ΜΕΛΕΤΗ ΤΟΥ ΠΕΔΙΟΥ ΤΩΝ ΜΕΤΑΤΟΠΙΣΕΩΝ ΣΕ ΑΠΕΙΡΕΣ ΠΛΑΚΕΣ ΜΕ ΕΣΩΤΕΡΙΚΕΣ ΡΩΓΜΕΣ. ΣΥΝΕΠΕΙΕΣ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΘΡΑΥΣΕΩΣ
… EXPRESSIONS(ARE GIVEN) OF THE STRESS AND STRAIN FIELD ARE GIVEN AROUNG THE CRACK TOP. IN THE SECOND, THIRD AND FOURTH CHAPTER AN EXACTLY AND DETAIL STUDY HAVE BEEN GIVEN FOR THE EXACT DISPLACEMENT FIELD AND THE EXACT SHAPE OF THE DEFORMED CRACK. IT IS ALSO REFERRED TO THE MODE OF OVERLAPPING OF …
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Prostate Tissue Motion Tracking and Ultrasound Elastography Using Tissue Mechanics Derived Constraints
… algorithms that output stiffness, strain, and displacement data captured by ultrasound radio frequency readings, offers a potential solution to these challenges. An initial algorithm utilizing dynamic programming and analytic minimization estimates the radial and angular displacements from a …
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STUDY OF THE LOADING OF PILES USING A SEMI-ANALYTICAL METHOD AND THE DIGITAL IMAGE CORRELATION TECHNIQUE
… pile groups to axial and lateral loading and the displacements induced in the soil by it are studied in this work using theoretical and experimental approaches. The theoretical solution for the loading of piles is based on idealized displacement forms, energy principles and calculus of variations. …
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Pulsed-Laser Ultrasound Generation in Fiber-Reinforced Composite Material
… Green function which represents the displacement field from the idealized synthetic sources localized precisely in both space and time. A two-dimensional numerical analysis utilizing a finite difference method for computation of the Green function in a finite plate is developed which …
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