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 196 for “"micromechanical"”.
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Micromechanical fatigue testing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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DSMC modeling of micromechanical devices
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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A micromechanical silicon oscillating accelerometer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Micromechanical modelling of advanced hierarchical composites
… are explored. Firstly the homogenization and micromechanical response under compression of a gold/epoxy nanocomposite is investigated. Investigation into the stress-strain response within the material reveals a complex interaction between the constituents resulting in both compressive and …
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Micromechanical actuators for insect flight mechanics
… goal of our project is to design and fabricate micromechanical actuators, which will be mounted onto the moth antennae. Our collaborators will study the flight control mechanism by mechanical stimulation. Our first step was to fabricate "dummy" silicon rings for our biologist collaborators for …
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Micromechanical modeling of concrete at early age
The focus of this research is a micromechanical characterization of Portland cement concrete at early age (less than 28 days). Concrete’s viscoelastic properties change significantly at early age due to solidification of its matrix component. Bažant’s solidification theory models concrete as a …
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Micromechanical Modelling of Wood and Fibre Properties
… also studied in a preliminary way by means of micromechanical modelling. Three-dimensional finite element models of straight fibres of undeformed and of collapsed cross-sectional shape were involved. Both the force-displacement relationship and the moisture-induced deformations needed for …
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A micromechanical biosensor with inherently differential readout
… of cost, time and throughput. Cantilever-based micromechanical sensors detect biomolecular adsorption by means of surface-stress-induced cantilever bending. This technique enables sensitive, scalable and label-free detection of biomolecules in real-time. However, micromachined cantilevers are …
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Micromechanical Aspects of Aging in Granular Soils
Granular soils exhibit a generally beneficial change in engineering properties with time after deposition or densification, during a process commonly known as aging. Soil properties reported to change during aging include the small strain modulus and stiffness, penetration resistance, liquefaction …
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A micromechanical model for predicting tensile strength
A novel micromechanical model for predicting the failure of polymeric and ceramic matrices under an applied global tensile loading is presented. The model is based on a Weibull statistical type of approach and incorporates eleven different variables to simulate different micromechanical failure …
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Micromechanical Simulation of Fatigue in Nodular Cast Iron
… of nodular cast iron (NCI) is investigated using micromechanical simulations. An elastic-plastic porous material experiences an increase in a void volume fraction with each cycle of loading. This is called void ratchetting. The hypothesis of this thesis is to explain the fatigue failure of NCI …
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Micromechanical models of delamination in aluminum-lithium alloys
Aluminum lithium (Al-Li) alloys are lighter, stiffer, and tougher than conventional aerospace aluminum alloys. Replacing conventional aluminums with Al-Li could substantially decrease the weight and cost of aerospace structures. However, Al-Li alloys often fracture intergranularly via a mechanism …
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Experimental and computational micromechanical study of fiber-reinforced polymers
… was modeled by the finite element simulation of micromechanical models which represented the microstructure of the real material. Following the previous experimental observation, the interface decohesion and the failure of the matrix were included in the computational model. The simulation …
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Micromechanical study of two-phase flow during air sparging
Air sparging (AS) is an in-situ soil/groundwater remediation technology, which involves the injection of pressurized air/oxygen through an air sparging well below the region of contamination. The efficiency of the in-situ sparging system is mainly controlled by the extent of contact between …
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A novel precision voltage reference using a micromechanical resonator
… a precision voltage reference (PVR) based upon a micromechanical resonator. The precision voltage reference consists of two closed loop controllers and a nonlinear resonator. The oscillator loop maintains oscillations in the resonator. The phase locked loop is a frequency control loop that locks …
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Sound-induced micromechanical motions in an isolated cochlea preparation
… for observing three-dimensional motions of micromechanical structures in the apical region of an isolated gerbil cochlea. The cochlea is submerged in a low-chloride, low-calcium artificial perilymph solution and cemented to the bottom of a Petri dish at an angle. The bone above scala …
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Finite element based micromechanical modeling of periodic composite microstructures
… chosen and studied using finite element based micromechanical models. Simulations were conducted parametrically varying the volume fraction with a fixed strut length, the proportion of the polymer coating to the elastomer core used in the composite struts (coating fraction), and the size of the …
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