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 83 for “"strain fields"”.
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Characterization of local strain fields in cross-ply composites under transverse loading
The student, Ariel Wilhelmsen, accepted the attached license on 2015-06-17 at 11:38.
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The mutual influence of strain fields and point defect distributions in krypton implanted polycrystalline titanium
… of foreign interstitial atoms under stress fields, using the Rutherford backscattering to obtain depth profiles, and synchroton radiation diffraction for the determination of stress fields. This has been achieved by creating a well designed model system of krypton implanted polycrystalline …
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Experimental investigation of stress and strain fields in a ductile matrix surrounding an elastic inclusion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Characterizing hydrogel imposed strain fields on brain tissue phantom for use in neural implant device coatings in presence of micromotion
… coatings for glass brain implant devices on strain fields imposed by those devices to brain tissue due to micromotion in the brain. PEG hydrogels were created using macromers of 2000-8000 Mw and 5-20 wt.% in solution. The moduli of the hydrogels were calculated via Hertzian analysis of …
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Stresses and strain in silicon: 3-dimensional analytical capabilities for the non-invasive evaluation of strain fields in Si wafers and packaged chips
… novel techniques for the in situ imaging of strain and internal damage in processed Si wafers and packaged Si chips. X-Ray Diffraction Imaging (XRDI) is a powerful, non-destructive technique for the imaging of strain in crystalline materials. Traditionally, section transmission topography …
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Methodologies for Quantifying and Characterizing Strain Fields Resulting from Focused Ultrasound Therapies in Mouse Achilles Tendon using Ultrasound Imaging and Digital Image Correlation
… method of quantifying tissue displacements and strains of a deforming material using high resolution imaging DIC programs can evaluate and interpolate strain data by applying statistical image processing algorithms and solid continuum mechanics principles using a set of sequential image frames …
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Nanoscale quantification of stress and strain in III-V semiconducting nanostructures
… many of the methods used to calculate stress and strain in 2D bulk systems are no longer valid as free surface effects allow for relaxation creating more complicated stress and strain fields. These inhomogeneous strain fields could have significant impacts on both device fabrication and operation. …
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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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Strain inhomogeneities during plasticity and creep of metals: representative volume elements and microscale strain predictions
This work investigated microscale strain inhomogeneities during plasticity and creep of an austenitic stainless steel alloy, namely stainless steel 709. Digital image correlation (DIC) was employed to experimentally measure strain fields at the microstructural level (defined as a level comparable …
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Effects of underfill material on solder deformation and damage in 3D packages
… presence of underfill material on the stress and strain fields and evolution of failure of an FEA model that is representative of a solder joint in a 3D IC package. The model solder joint is placed between two silicon substrates in contact with through-silicon vias without any other devices or …
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Investigation of Advanced Material Through Digital Volume Correlation Measurement Techniques
… their heterogenous structure, displacement and strain fields developed under loading conditions are often complex and difficult to predict. Digital volume correlation (DVC) offers a novel method for the deformation analysis of composite structures. Through the utilization of micro-computed …
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An investigation of shear response of composite material systems
… systems is presented. The uniformity of the strain fields is studied experimentally and numerically for different specimen configurations. Conventional strain gage measurements and the moiré interferometry technique are employed to obtain information of actual deformation of the specimen. …
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Intranuclear strain measured by iterative warping in cells under mechanical and osmotic stress
… oversimplify the inherent complexity of internal strain patterns. This presents technical challenges to simultaneously observe small scale nuclear mechanics and gene expression levels inside the nuclei of cells embedded in their native extracellular environment. Therefore, a hybrid imaging and …
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Advanced experimental measurements of heterogeneous strain and temperature change in metals
… to be similar for the two cases studied. DIC strain fields and the corresponding plastic zone sizes were compared between the two cases. From these strain fields, the slip irreversibility, the difference between forward and reversed strains at the crack tip, was quantitatively measured. The …
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Relating fatigue crack growth to microstructure via multiscale digital image correlation
… was developed and used to measure accumulated strain fields in the plastic wake of a fatigue crack. Additionally, the evolution of the strain field as the fatigue crack grew through the imaging region was captured using an in situ real time DIC technique. Finally, these strain fields (from both …
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Asphalt mixture evaluation using performance space diagrams, digital image correlation, and discrete element modeling
… little research has been completed using DIC strain fields throughout low temperature asphalt concrete fracture tests. Finally, there is a need for improved heterogeneous DEM fracture modeling methods to remove trial-and-error evaluation of optimal mastic fracture properties and to add …
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Mechanical response of polyether polyurethane foams under multiaxial stress and the initial yielding of ultrathin films
… the mechanical response in the form of a stress-strain curve or a force-displacement curve; in several tests we use a Digital Image Correlation (DIC) technique to compute the strain fields on the surface of the specimen. For some loading cases, including uniaxial compression along the rise …
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Reaction Paths for Self-Organized Surface Roughening of Silicon-Germanium Alloys During Hydride Gas-Source Molecular Beam Epitaxy
… layers were grown at Ts = 450°C, where strain-induced roughening is completely quenched, to thicknesses greater than the critical value for misfit dislocation formation (tc ≃ 100 nm) to probe the effect of thetaH on cross-hatch formation. At t slightly larger than tc, surface …
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