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Showing 1 to 20 of 41 for “"internal stress"”.
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Thermal Expansion, Internal Stress, and Strength of Glass-Crystal Composites
Made available in DSpace on 2014-12-10T17:32:38Z (GMT). No. of bitstreams: 1 6915410.pdf: 3084944 bytes, checksum: b7bc29b46702c51d414feb4a93759bc3 (MD5) Previous issue date: 1969
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Mechanics of Seashell Growth: Examining the relationship between incompatibility, shape, and internal stress
… develop, both their macroscopic form and their internal microstructure evolve, with the latter transitioning between different layer sizes and orientations during the shell's growth process. Several studies have examined the morphogenesis of seashells, with some considering the kinematics of …
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A new vibrational technique for measurement of stress variations in thin films
… physical deposition, etc.) shows that internal stress is a common problem, particularly in industrial applications. The presence of stress influences the properties of the film and when severe may cause the film to buckle or crack. There is a significant technological and industrial …
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Effect of minor phase additions on the microstructure and dielectric properties of barium titanate ceramics
… samples were accompanied by an increase in the internal stress level with decreasing grain size and increasing concentration of core-shell grains. The core-shell grains are comprised of a core of unmodified BaTiO$\sb3$ and a shell of Zr modified BaTiO$\sb3$, Ba(Zr$\sb{\rm x}$Ti$\sb{\rm …
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Control of electrodeposit properties of nickel and nickel alloy by pulse plating.
… The mechanical properties of micro-hardness and internal stress obtained using the EFCO stress-meter and X-ray diffraction were measured as a function of bath composition, on/off cycles,current density, types of plating and solution pH. The structure and composition of alloys deposited have been …
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Ocean fronts formed at sea ice boundaries
… not well represented. The functional form of the internal stress in the ice momentum equation is investigated with the model. When the amplitude of the internal stress decreases by several orders of magnitude in a few grid points the model was unable to sustain such a gradient and was liable to …
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High energy x-ray diffraction microstructural analysis of oxide dispersion strengthened steel for advanced nuclear systems
… was subjected to increasing uniaxial tensile stresses up to failure, with a total of nine axial scans for each of the stress/strain states. The wide range of scans allowed the direct measurement of material responses from both necking and un-necked parts of the specimens. From the X-ray …
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Effects of stress on material properties, intrinsic and extrinsic behavior, and electromechanical response of stress-biased actuators
… load bearing capacity that can be fulfilled by stress-biased actuators, including Thunder™ (THin UNimorph Driver and sEnsoR). Thunder™ is a composite laminate actuator based on an elastic metal layer and a piezoelectric wafer bonded together with a thermoplastic material (LaRC-SI). On cooling …
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Dislocation Modeling of Mechanical Properties of Nanolayered Composite Materials
… determined approximately by the critical applied stress to eliminate thecompressive biaxial stress in alternating layers of the composite. Yield strength maps areconstructed for nanoscale multilayered composites consisting of alternating layer phasesin which the volume fraction of the phases, …
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Finite Element Analysis of Thermal-Mechanical Instabilities in Nonmetallic Friction Composite Material
… can induce uneven temperature gradient and internal stress in brakes to increase the chance of thermal buckling to occur but the increase in gradient temperature does not induce vibration. Also, thermal buckling modes tend to induce vibration in brakes. Thermal buckling and thermoelastic …
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Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment
… and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic …
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A static model of a Sendzimir mill for use in shape control.
… in the steel industry. Shape is defined as the internal stress distribution resulting from a transverse variation in the reduction of the strip thickness. The object of shape control is to adjust the mill so that the rolled strip is free from internal stresses. Both static and dynamic models of …
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Micromechanical Aspects of Aging in Granular Soils
… cementation due to microbiological activity, internal stress redistribution caused by particle crushing, and buckling of the load chains due to particle slippage. New evidence points out that internal and time-dependent changes in the soil structure caused by particle slippage and …
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The Development and Application of a Trapezoidal Shear Panel for Use in Finite Element Codes
… to model aircraft structures. An equilibrium stress-based element with pure shear resultants on its sides was developed using the principle of complementary virtual work. The internal stress field was derived from a complete polynomial Airy stress function. The element was numerically tested …
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Accuracy, Precision, and Resolution in Strain Measurements on Diffraction Instruments
Diffraction stress analysis is a commonly used technique to evaluate the properties and performance of different classes of materials from engineering materials, such as steels and alloys, to electronic materials like Silicon chips. Often to better understand the performance of these materials at …
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Characterization of Flexible Hybrid Electronics Using Stretchable Silver Ink and Ultra-Thin Silicon Die
… and die warpage, likely due to high levels of internal stress caused by the dicing and thinning process. Finally, an innovate pairing of serpentine copper clad traces on TPU was tested for reliability performance using traditional solder for die attachment.</p>
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Deformation and residual stresses at the intragranular scale – a study using high energy x-ray diffraction and modeling in polycrystalline alloys
Deformation and internal stress distribution in polycrystalline materials depend upon interactions among neighboring grains and sub-grains (substructure inside a grain). With the advent of high energy x-ray diffraction (HEXD), using synchrotron radiation, it has become possible to probe the bulk of …
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An electrothermally-actuated bistable MEMS relay for power applications
… a bistable mechanism that does not rely on internal stress or hinges for its bistability, which is then combined with transient electrothermal actuation and contact structure to develop a MEMS relay for power switching. The relay components, fabricated by a through etch of a silicon wafer …
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Granular Shape Memory Ceramics
… materials based on zirconia with a reversible, stress-inducible martensitic phase transformation. Compared to metallic shape memory alloys, SMCs have broader operating temperatures, higher critical stresses, and larger mechanical hysteresis loops. These advantages make SMCs attractive for …
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Study of Copper Nanowires With Five-Twinned Structure Grown by Chemical Vapor Deposition and Their Applications
… twin boundaries are mismatched irregularly. The internal stress could be relaxed by the defect generation in one of the five subcrystals and the displacement of the pentagonal axis of the nanowire. The growth mechanism for the 1-dimensional CuNW-growth is proposed to be the passivation by the …
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