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Showing 1 to 20 of 25 for “"Displacement Rate"”.
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Displacement rate and temperature effect on asphalt concrete cracking potential
… spectrum of conditions including temperature and rate of displacement is needed. This thesis has two major objectives. First is to gain an overall understanding of fracture behavior of AC under a wide spectrum of temperature and rates of displacement. Second is to identify the combination of …
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Effect of ion irradiation on the rate dependence of plastic deformation of extruded Zr-2.5%Nb
… properties such as the strain hardening, strain rate sensitivity and apparent activation volume were investigated. The effects of Zr+ ion-implantation occurring at 300°C, simulating irradiation-induced damage, and the strain rate of loading on these properties were also investigated. Two methods …
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The use of plasticity theory in predicting the deformational behavior of ice and sand-ice systems
… pressure (atmospheric to 4, psi), and loading rate (2.5 - 25 psi/sec). All of the indentation tests were conducted at atmospheric pressure and at a temperature of about -12°F. Most of the wedge indentation tests were conducted at a constant displacement rate of .12 in/min, which is …
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Fracture of Hot-Pressed Silicon Nitride at Elevated Temperatures
… and 1350(DEGREES)C in four point bend at three displacement rates. Fracture stress and critical stress intensity factor were calculated and plotted versus temperature for each displacement rate. The scanning electron microscope, transmission electron microscope and scanning Auger electron …
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Movement of Reactivated Landslides
"Because the displacement rate of ""very slow"" and ""extremely slow"" moving reactivated landslides in stiff clays and clay shales, is typically controlled by fluctuations in piezometric levels; the relations between rate of movement and piezometric levels and factor of safety (proportional to …
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Characterization of a Pressure Sensitive Adhesive (PSA) for Mechanical Design
… used in joint designs. This technique was demonstrated with Beam-on-Elastic Foundation, Shear Lag, and Shape Factors. Design examples successfully demonstrated the application of all of these models in the analysis and design of simple adhesive joints. The material properties of PSAs are a …
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Specimen size effects in slow strain-rate testing
… the effect of specimen dimensions in slow strain-rate environmental effects testing. Tension tests of free machining brass were conducted in a mercuric nitrate solution at a constant crosshead displacement rate of 10⁻³(inch/sec). Thirty-six smooth round bar specimens with different dimensions were …
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On the observations of autowaves and avalanches in an aluminum magnesium alloy
… in uniaxial tension under a constant applied displacement rate. In situ digital image correlation captured the 2D spatial strain field which was differentiated to find the local strain rate field. Propagating waves in the local strain rate were observed in an extended elastoplastic transition …
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Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)
… pressure is shown to scale with the volumetric displacement rate, which is related to the plate deflection. A Green's function approach is then used to explicitly solve for the plate deflection of a bimorph and unimorph PMUT with an arbitrary number of circular or ring electrodes. The resulting …
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The geology and geochemistry of volcanic rocks in the Lava Mountains, California: Implications for Miocene development of the Garlock Fault
… a major continental strike-slip fault that separates the southwestern Basin and Range to the north from the Mojave block to the south. Chemical similar dacitic lava and pyroclastic flows erupted from the 9-km diameter Western Lava Mountains volcano. Dacites with limited chemical variability …
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The Influence of Pore Fluid on The Stability of a Rock Mass With a Weakened Zone
… and diffusive softening on the stability of saturated rock is investigated. The analysis considers an infinite slab of fluid-infiltrated rock which contains a sublayer of weakened material. Inelastic deformation is allowed throughout the slab, with strain softening possible. The boundaries are …
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A feasibility study of the use of microwaves to measure radical and differential burning rates in solid propellant rockets
The subject investigation demonstrated that it is feasible to use the microwave technique to measure radial burning rates ,and differential burning rates in solid propellant rocket motors. A simulator, consisting of a spiral rotating in an oil bath, was used to represent the curved burning surface …
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The origin of recumbent fold nappes: The Lochalsh fold as the main example
… grain shape analysis, measurement of conglomerate pebbles, magnetic anisotropy and palaeomagnetism strain patterns have been obtained for these nappes. Different rock types control the style of folding, and, in part, the sequence of structures developed. The development of. each recumbent fold …
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Inelastic Analysis of the Loop Tack Test for Pressure Sensitive Adhesives
… Curves of the pulling force versus the top displacement (i.e., tack curves) are obtained throughout the simulation. A parametric study is made with respect to the nonlinear spring function parameters, experimental uncertainties, and strip thickness. Anticlastic bending behavior is shown in …
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The fracture of epoxy resins and the effects of rubber inclusions
… been studied over a wide range of temperatures, displacement rates and specimen thicknesses. Both systems exhibit essentially the same types of crack growth behaviour. However, the values of fracture toughness for the rubber-modified epoxy were almost always significantly higher than those for …
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Biomechanical Comparison of Wire Circlage and Rigid Plate Fixation for Median Sternotomy Closure in Human Cadaver Specimens
… undergo open-heart surgery. Healing complication rates can be up to 5% of patients who undergo this procedure, with a morbidity rate of 50% if mediastinitis supervenes. A secure and rigid fixation of surgically divided sternum is critical to avoid healing complications. The purpose of this study …
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Landslide kinematics and interactions studied in central Georgia by using synthetic aperture radar interferometry, optical imagery and inverse modeling
… In the present work, I measure the surface displacement due to active landslides with different interferometric synthetic aperture radar (InSAR) methods. The slow landslides (several cm per year) are well detectable with two-pass interferometry. In same time, the extremely slow landslides …
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Cryogenic penetration and relaxation behavior of dry and icy lunar regolith simulants
… focuses on the potential of regolith (extraterrestrial soil) to provide valuable materials, yet regolith properties are poorly characterized at environmental extremes. Extraction concepts require detailed knowledge of the mechanical properties of dry and ice-saturated regolith. This study …
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Techniques for evaluating the behavior of apple skin under tensile loading
… tested. The Specimen were loaded at two constant displacement rates, yielding the skin's force deformation behavior. In addition, the skin was displaced to a constant deformation and held constant, the relaxation behavior being observed. The creep behavior was determined by subjecting the specimen …
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Development of the small punch test platform to evaluate the embrittlement of power plant materials
… the reaction load of the punch and the deformed displacement of the sample performed at a constant displacement rate according to CWA 15627:2007. Two SPT rigs were designed, manufactured and commissioned. These two were commissioned using FEM and tensile test results for validations. The steel …
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