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.
Results
Showing 1 to 20 of 22 for “"Bimaterial"”.
-
Probing extraordinary nanoscale energy transfer using bimaterial microcantilevers
Nanostructured materials have recently drawn a great deal of attention in the field of energy research such as for solar photovoltaic, thermophotovoltaic and thermoelectric applications. The energy transport properties of nanostructures can differ greatly from their bulk counterparts because the …
-
Determination of thermal strains in the neighborhood of a bimaterial interface
An experimental analysis was conducted on a bimaterial plate of steel and brass, subjected to a uniform temperature change. The steel and brass portions of the plate were joined along a common edge with a nearly zero thickness medium. Whole-field, in-plane displacement measurements U and V were …
-
Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation
… intensity behavior near to and coincident with bimaterial interfaces. Homogeneous, bonded homogeneous, and bonded bimaterial single edge-cracked tension specimens are utilized throughout the investigation for comparative purposes. The first series of tests involves machined cracks obliquely …
-
Effect of a Graded Layer on the Plastic Dissipation During Mixed-Mode Fatigue Crack Growth on Ductile Bimaterial Interfaces
… of a physically based mode-mix definition for bimaterial crack tips based on the total plastic dissipation developed by Daily. In addition, this dissertation provides comprehensive numerical results for the effects of an elastic/plastic mismatch, mode-mix, and graded layer height on the total …
-
Development of microcantilever mid-infrared detectors and sources and their application in infrared spectroscopy
… the dynamic thermomechanical response of bimaterial cantilevers to periodic heating by an IR laser. A model relates incident IR radiation, heat transfer, temperature distribution in the cantilever, and thermal expansion mismatch to find the cantilever displacement. Silicon nitride-aluminum …
-
Impact of silicon nitride thickness on the infrared sensitivity of silicon nitride-aluminum microcantilevers
… the performance of silicon nitride - aluminum bimaterial cantilever infrared sensors. A model predicts cantilever behavior by considering heat transfer within and from the cantilever, cantilever optical properties, cantilever bending mechanics, and thermomechanical noise. Silicon …
-
Materials selection for microsystems actuators
… combination (Al on Si) for high work per volume bimaterial electrothermal actuators. Actuation frequencies of the order of ~10 kHz can be achieved electrothermally at scales less than 100 ?m using engineering alloys. Although engineering polymers on Si are promising for high displacement …
-
ΑΚΑΜΠΤΑ ΚΑΜΠΥΛΟΓΡΑΜΜΑ ΕΓΚΛΩΒΙΣΜΑΤΑ ΣΕ ΕΠΙΠΕΔΗ ΕΛΑΣΤΙΚΗ ΜΗΤΡΑ ΜΕ ΡΩΓΜΗ ΣΤΗ ΔΙΕΠΙΦΑΝΕΙΑ
… TIP IS DERIVED AND THE BRITTLE FRACTURE OF THE BIMATERIAL SYSTEM IS STUDIED.
-
Multiphase Fluid-Material Interaction: Efficient Solution Algorithms and Shock-Dominated Applications
… methods in this regard is to locally construct bimaterial Riemann problems, and to apply their exact solutions in flux computation, such as the one used in the preceding parts of the dissertation. For general equations of state, however, finding the exact solution of a Riemann problem is …
-
Thermomechanical sensitivity of microcantilever in the mid-infrared spectral region
… reports the thermomechanical sensitivity of bimaterial cantilevers over a mid-infrared (IR) spectral range (5-10 µm) that is critical both for chemical analysis via vibrational spectroscopy and for direct thermal detection in the 300-700 K range. Mechanical bending sensitivity and noise were …
-
Mechanical properties of degraded PMR-15 resin
… surface layer and the interior material. Bimaterial strip specimens consisting of oxidized surface material and unoxidized interior material were constructed and used to determine surface layer shrinkage and CTE. Results confirm that the surface layer and core materials have substantially …
-
Experimental Studies on the Mechanical Durability of Proton Exchange Membranes
… under the same blister pressure profiles. Bimaterial specimens fabricated by bonding a piece of PEM to a substrate material were used to measure the hygral stresses, compressive and tensile, in the PEM during relative humidity cycles. The substrate material and its thickness were carefully …
-
Mechanical Behavior of Adhesive joints Subjected To Thermal Cycling
… residual stresses in an elastic-viscoelastic bimaterial system incrementally shift over time when subjected to thermal cycling. Tensile axial and peel stresses develop over a long period of time as a result of viscoelastic response to thermal stresses induced in the polymeric layer. The …
-
Investigative Application of the Intrinsic Extended Finite Element Method for the Computational Characterization of Composite Materials
… the filler agents are defined as individual weak bimaterial interfaces. Though a series of RVE studies, calculating the effective elastic material properties of carbon nanotube-epoxy nanocomposite systems, the benefits in substituting the conventional mesh dependent FEM with the mesh independent …
-
Experimental investigations on the influence of curvature and materials on near-field thermal radiation
The bimaterial cantilever based near-field thermal radiation measurement setup was an experimental breakthrough in the field of near-field thermal radiation. The setup distinguishes itself from other experimental configurations at that time by allowing a direct measurement of the near-field thermal …
-
Axial Cyclic Response of Unnotched and Notched Carburized Cylindrical Members Under Constant Amplitude Completely Reversed Loading
… locations of interest. It is suggested that a bimaterial model is adequate for the purpose of finite element stress analysis of carburized members. Multiaxial fatigue approaches proposed by Sines and Manson are utilized for the prediction of notched member life using the unnotched fatigue data. …
-
Delamination in reinforced concrete retrofitted with fiber reinforced plastics
… fracture mechanics can be used to describe the bimaterial elasticity and complex stress intensity at the delamination tip and provide a criterion governing the propagation of delamination using energy methods. Then, peeling processes occurring at existing cracks in the retrofitted system are …
-
Experimental and Numerical Investigations on the Durability and Fracture Mechanics of the Bonded Systems for Microelectronics Application
… and simple beam theory. The curvature of a bimaterial strip was chosen to characterize the residual stress in the specimen, and the strain energy release rate, caused by both tensile and compressive residual stresses in the adhesive, was derived for an asymmetric double cantilever beam …
-
Using far-field measurements for determining mixed-mode interactions at interfaces
… can be used to represent the interactions at a bimaterial interface during fracture and adhesion. The goal of this work is to develop a direct method to extract mixed-mode TSRs using only the far-field measurements. The first topic of the dissertation deals with extracting mixed-mode TSRs based …
Page 1 of 2