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 45 for “"deformation-induced"”.
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Activation of conductive pathways via deformation-induced instabilities
… this unique ability to activate conductive via deformation-induced instabilities. Two microstructural features, the contact nub and the conductive pathway, are introduced to make connections within the void and between the voids upon pattern transformation. Finite element-based micromechanical …
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Atomistic simulation of deformation induced rotation in Cu-Nb composites
Accumulative roll bonding (ARB) of three copper-niobium (Cu-Nb) nano-composite models is simulated using molecular statics techniques to assess the rotational stability of Cu-Nb interfaces at high strains up to 90% thickness reduction. Crystals strain and rotate under compression, and certain Cu-Nb …
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Kinetics of deformation-induced transformation of dispersed austenite in two alloy systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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Deformation induced molecular behavior of Cis 1,4-polyisoprene and its nanocomposites monitored by solid-state NMR
… this thesis could be applied to analyze strain induced changes in interfacial area for samples which are not optically clear or samples in which the particle dimensions make microscopy techniques difficult. The quantitative discrepancy between the two techniques suggests that NMR captures …
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Modellierung der Verfestigung technischer Aluminiumlegierungen
… of technical aluminium alloys as function of the deformation temperature and strain rate is described in two ways. First a phenomenological description is made using well known models from literature. For some specific cases the models are expanded. Furthermore a new model is developed which is …
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Evaluation of the formability properties of nitrogen alloyed metastable austenitic stainless steels
… At certain alloy compositions, transformation induced plasticity (TRIP) occurs. TRIP depends on the manner in which deformation induced martensite forms in the steels. Incipient necking is resisted if the martensite forms gradually and selectively, preventing propagation of micronecks and …
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Fragmentation and reaction of structural energetic materials
… to release energy. Fragmentation and impact induced reaction are not well characterized phenomena in SEMs. The structural energetic systems under consideration here combine aluminum with one or more of the following: nickel, tantalum, tungsten, and/or zirconium. These metal+Al systems were …
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Ductile fracture modeling : theory, experimental investigation and numerical verification
… envelope in the principal stress space. Plastic deformation induced damage is expressed by an integral of the damage rate measured at current loading and deformation status with respect to the fracture envelope. A non-linear damage rule is proposed to characterize the damage accumulation with …
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The effect of drawing strain on the fatigue behaviour of stainless and carbon steel wires
… strain. This improvement is attributed to the deformation-induced phase transformation of (ϒ) austenite to α'-martensite. X-ray diffractometer traces show that the amount of strain-induced martensite varied from 8% in the wires drawn at low strain (0.09) to 36% in the wire samples drawn to …
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Understanding the Stability of Retained Austenite in High-Carbon Steels: Modelling and Alloy Design
… the transformation occurs at the early stages of deformation. There are few models that account for the delayed transformation, because previous models were mostly developed from low-carbon steels that exhibit martensite transformation behaviour that is different from high-carbon steels. Also, few …
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Convective intracellular macromolecule delivery for cell engineering applications
… macromolecule delivery using mechanically-induced, transient cell volume exchange. Ultrafast microfluidic cell compressions (<1 ms) are used to cause brief, deformation-induced cell volume loss followed by volume recovery through uptake of extracellular fluid. Macromolecules suspended in …
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Controlling microstructure of nanocrystalline thermoelectrics through powder processing
… of the compound and its elements, rendering deformation-induced heating effects especially prevalent. Next, during sintering operations of the powders, the kinetics of grain growth and porosity evolution were studied. By quantifying these processes, a thermal budget map for the …
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Hydrogen in Austenite: What Changes after Martensitic Transformation?
… austenitic steel and bainitic steel. Their deformation induced phase transformation of austenite and the corresponding hydrogen desorption behaviour were studied using microscopy, diffraction, thermal desorption analysis and microprinting. This work has shown that the change in hydrogen …
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An investigation of wear and the performance of steels in the gold mining industry
… and also to examine the extent and depth of deformation induced by abrasive wear. Numerous proprietary wear resistant materials and stainless steels presently used in the gold mining industry together with other materials were included in this investigation. The abrasion and corrosion- …
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Instability-induced transformation of interfacial layers in composites and its multifunctional applications
… cells in nature, this thesis explores the deformation-induced wrinkling instability transformation in the microstructure of composites with thin interfacial layers. The hybrid microstructure of a composite material has an essential influence on the effective properties and behavior of the …
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Interfacial Dynamics and Applications in Optofluidics
… solution for the resonator interface deformation due to the radiation pressure. We then derive an analytical approach that can exactly calculate the droplet deformation induced by the radiation pressure. The accuracy of the analytical solution is confirmed through numerical analyses …
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Mechanism of subcritical crack growth in the alumina reinforced aluminum-copper composite: Effects of interface and matrix microstructure
… fatigue crack growth was accelerated by cyclic-deformation induced crack-tip overaging at 150$\sp\circ$C and by softening of the composite at 300$\sp\circ$C.
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Substrate curvature measurement system
… in a variety of processes, the measurement of deformation induced in a solid object by mechanical stress. One such process is during the manufacture of very large scale integrated circuits (VLSI). During this process a substrate is coated with a thin film to protect the micro circuitry formed …
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The Effect of Co on the Deformation Response of Fe-Mn Alloys
… and exhibit several interesting responses to deformation which lead to the possibility of desirable mechanical properties for many engineering applications. The addition of other elements to the system further improves properties and can lead to interesting effects like transformation induced …
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Hot ductility and its relationship to transverse cracking in steels
… The lower C level allowed large amounts of deformation-induced ferrite (equilibrium amounts) to form, ferrite having excellent ductility. mThe influence of both S in solution and elongated sulphides on hot ductility was also examined. Although elongated sulphides encouraged ferrite …
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