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 87 for “"Strain Field"”.
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Strain field near the surface due to surface traction.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. M.S.
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Development of a statistical method for validating ESDM strain-field output
… a statistical method for validating the ESDM strain-field output. Specifically, it addresses the problems of estimating the ESDM strain-field uncertainty, choosing an appropriate standard measurement, estimating the uncertainty in the standard measurement, and comparing the ESDM strain-fields …
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The second skin approach : skin strain field analysis and mechanical counter pressure prototyping for advanced spacesuit design
… The second experiment is an analysis of the full-field strain on the skin surface of the leg during knee flexion. A repeatable and quantitative technique for mapping the leg skin strain field is developed. The results of the algorithm indicate the magnitude of strain over the entire surface of the …
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Dynamic response of simply supported beams excited by piezoelectric actuators
… the piezoelectric actuator does not affect the strain field close to the free edge. Away from resonances, the force transfer mechanism is different and less efficient, and the free edge condition of the piezoelectric actuator does affect the strain field close to the free edge of the actuator. …
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Comparison and convergence studies of nonlinear finite element beam-column models
… The models differ in their respective strain field representations. Model 2 permits a linear longitudinal and transverse strain variation. The strain field of model 3 can vary linearly in the transverse direction and quadratically in the longitudinal direction. The system model and …
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Electronic structure and optical properties of sb-based self-assembled quantum dots for the mid-infrared range
… had been obtained with an intrinsic elastic strain field arising from the lattice mismatch between the matrix and QD materials. The strain field plays a very significant role in the fabrication of the self-assembled QDs (SAQDs).Strain fields inside SAQD structures strongly affect the …
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Digital image correlation analysis of alkali silica reaction in concrete with recycled glass aggregate
… for measuring the in-plane displacement and full-field strain of the surface of an object. DIC can be implemented as a low-cost non-destructive technique using a time series of images of the object of interest. The advantages of DIC inspires the application in studies of concrete alkali silica …
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Osteoarthritis Induced Glenoid Morphology and Bone Quality: An Evaluation of Augmented Glenoid Components
… of augmented glenoid components. The bone strain field was also compared when different augmented glenoid components underwent simulated joint loading using finite element analysis. Asymmetrically eroded glenoids were found to have denser bone (p
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Structure of Turbulence in a Fully Transpired Channel
… at the wall are amplified strongly by the mean strain field, and result in enhanced turbulence downstream. Therefore, the details of the transpired wall boundary conditions are very important, and non-ideal boundary conditions can lead to substantial modification in the flow structure.
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Molecular Dynamics and X-ray Powder Diffraction Simulations: Investigation of nano-polycrystalline microstructure at the atomic scale coupling local structure configurations and X-ray powder Diffraction techniques
… to equilibrate the system: the corresponding strain field was described both in the core and in surface regions of the different crystalline domains. New methods were developed to calculate the strain tensor at the atomic scale. Line Profile Analysis (LPA) was employed to retrieve the …
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Relating fatigue crack growth to microstructure via multiscale digital image correlation
… this task since it provides quantitative full-field deformation measurements at multiple length scales. The first part of this work introduces two DIC-based techniques for measuring fatigue crack closure levels and demonstrates them on titanium. At the macroscale, a least squares regression was …
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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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Fatigue Life Estimates for a Notched Member in a Corrosive Environment (Corrosion)
… fatigue damage is best described by the notch strain field, and the portion where nominal stress and crack length dominate fatigue damage assessment, was used to estimate fatigue lives for center notched plate specimen.
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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 …
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ΜΕΛΕΤΗ ΤΗΣ ΕΛΑΣΤΙΚΗΣ-ΑΠΟΛΥΤΩΣ ΠΛΑΣΤΙΚΗΣ ΕΝΤΑΤΙΚΗΣ ΚΑΙ ΠΑΡΑΜΟΡΦΩΣΙΑΚΗΣ ΚΑΤΑΣΤΑΣΕΩΣ ΡΗΓΜΑΤΩΜΕΝΩΝ ΠΛΑΚΩΝ ΣΕ ΣΥΝΘΗΚΕΣ ΕΠΙΠΕΔΟΥ ΕΝΤΑΣΕΩΣ
… METHOD OF DEFINITION OF THE STRESS AND STRAIN FIELD AROUND THE CRACK TIP IN METALLIC EDGE CRACKED SPECIMENS DEVELOPS. THEBIREFRINGENT COATING TECHNIQUE WAS APPLIED TO ESTIMATE ELASTIC AND PLASTIC DEFORMATIONS AS WELL AS TO DEFINE THE ELASTIC-PLASTIC BOUNDARIES IN SUCCESSIVE LOADING STEPS …
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ΘΕΩΡΗΤΙΚΗ ΚΑΙ ΠΡΑΚΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΕΦΑΡΜΟΓΗΣ ΤΩΝ ΓΕΩΦΑΣΜΑΤΩΝ ΣΤΗΝ ΕΝΙΣΧΥΣΗ ΔΡΟΜΩΝ ΧΑΜΗΛΗΣ ΚΥΚΛΟΦΟΡΙΑΣ
… OF WEAK PAVEMENTS. 8. STUDY OF THE STRESS-STRAIN FIELD OF WEAK PAVEMENTS EITHER REINFORCED OR NOT WITH GEOTEXTILES. 9. CONCLUSIONS- REFERENCES-APPENDICES.
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Cenozoic extension superimposed on a Mesozoic thrust belt, central Nevada
… events; (2) record a rotation in the stress field through time; and (3) locally developed within a three dimensional strain field as opposed to plane strain; The Sand Spring, Ike Spring, and Indian Spring thrusts (previously undocumented) regionally correlate to the Duckwater and White Pine …
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Process modeling for solidification microstructure and transient thermal stresses in laser aided DMD process
… of a fully coupled temperature-stress/strain field model"--Abstract, page iii.
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Validation of a Computational Model for Predicting Fatigue Life
… are demonstrated. A high-resolution plane strain FEM analysis that resolves the strain field near a stress concentration is shown to be necessary to achieve accurate predictions of fatigue crack nucleation and fatigue crack growth.
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Measurement of residual stresses and solving the inverse problem to infer dislocation distributions
… computer simulations, a technique for measuring strains and then inferring an optimal dislocation distribution to generate the residual stress state is presented here. A continuum dislocation formulation is described in detail and optimization results are compared with a simpler discrete …
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