7,608 Result(s)
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Article
A metallic replica technique for scanning electron microscopy
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Article
Rate-type creep law of aging concrete based on maxwell chain
It is shown that the linear creep law of concrete can be characterized, with any desired accuracy, by a rate-type creep law that can be interpreted by a Maxwell chain model of time-variable viscosities and spr...
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Pressure and normal stress effects in shear yielding
The classical yielding theory of Tresca is generalized to include the effects of both hydrostatic pressure and normal stress in the slip plane. The three-parameter theory is the most general for polyhedral yie...
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Slip processes in the deformation of polystyrene
Two slip processes are characterized in the deformation of atactic polystyrene by compression. In the optical microscope, one appears as intensive shear bands and the other as diffuse shear zones. But in the e...
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The effect of specimen size on the mechanical behaviour associated with crazing
Since crazes generally nucleate at the surface it is expected that the size of the specimen, as described by the ratio of surface area to volume, should affect the mechanical behaviour of polymers which deform...
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Article
Elasticity problems of a slender Z-crack
The configuration of a Z-shaped crack is defined by a web length, two flange lengths, and two flange-web angles. A Z-shaped crack is said to be slender if the flange-web ratios are small. These ratios may then be...
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Article
Maximum-energy-release-rate criterion applied to a tension-compression specimen with crack
The title problem is studied by using the explicit asymptetic analysis presented in the accompanying paper. The asymptotic analysis indicates that the very basic problem is a semi-infinite L-shaped crack gover...
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Microstructural aspects of crack propagation in ceramics
X-ray microradiographic examination supported by optical and SEM observations was used to study crack propagation in various ceramics, including glasses and cubic and noncubic polycrystalline bodies of differe...
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Article
Microstructural aspects of crack propagation in ceramics
X-ray microradiographic examination supported by optical and SEM observations was used to study crack propagation in various ceramics, including glasses and cubic and noncubic polycrystalline bodies of differe...
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Kink bands by compression of ultra-drawn linear polyethylene
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Plane-strain buckling of cracks in incompressible elastic solids
The buckling of a crack in an incompressible elastic solid subjected to a crack-parallel compression is studied by using a small-deformation-superposed-on-large-deformation analysis. It is found that for a gen...
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Article
Oxidation weight gain and strength degradation of Si3 N4 with various additives
Oxidation behaviour and strength degradation, due to long-term high temperature exposure in air, of Si3N4 with MgO, ZrO2 or Y2O3, as densification aids have been studied. It was found that the weight change and s...
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Article
Oxygen-Trap** and Oxidation Induced by Laser Irradiation in Silicon
Rapid oxidation in silicon induced by nanosecond UV laser pulses has been recently reported [1]. A significant amount of oxygen was observed to be incorporated in the regrown silicon layer when irradiation took p...
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The tensile stress-strain behaviour of polystyrene in inert and gaseous environments
For the first time the intrinsic tensile stress-strain behaviour of polystyrene was measured in an inert atmosphere (He) from 77 to 350 K. The intrinsic tensile strength decreases monotonically with increasing...
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Article
Salt Creep Design Consideration for Underground Nuclear Waste Storage
This paper summarizes the creep consideration in the design of nuclear waste storage facilities in salt, describes the non-linear analysis method for evaluating the design adequacy, and presents computational ...
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Article
Surface Morphology and Electronic Properties of ErSi2
The surface of ErSi2, formed by the reaction of thin erbium layers with a single-crystal silicon substrate, is typically dominated by deeply penetrating regularly shaped pits. These pits are shown to have detrime...
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Electron microscopy and magnetic properties of Fe-Cr-Co-Si permanent magnet alloys manufactured by rolling-ageing technique
Four Fe-30/33Cr-11.5/12.5Co-0/1Si alloys (weight fraction) melted in air and treated by alternatively ageing and rolling have been studied by magnetic measurements and electron microscopy. The optimum treatmen...
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Article
Pt and Pd Silicides and Pd Germanide as Contact Metallizations for GaAs
Refractory metal silicides have been shown to form stable Schottky barriers on GaAs up to an annealing temperature of ∼850°C. In this study, the metallurgical and electrical stability of near noble metal (Pd a...
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Article
Transient Annealing of Boron Implanted Devices
Shallow-junction semiconductor devices have been fabricated using ion implantation and transient annealing with a Vari an IA-200 isothermal anneal er. Boron implanted diodes, npn bipolar transistors and CMOS r...
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Article
Two Dimensional Numerical Thermal Analysis of Silicon on Insulator Recrystallization Processes by a Moving Heat Source
The moving-zone melt recrystallization of polysilicon on insulator substrate has been studied with computer simulation methods. The most important parameters such as upper strip heater moving velocity, the pow...
