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Showing 1 to 17 of 17 for “"Extensometer"”.
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The design and development of a rosette extensometer of small gage length
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1957
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Development of a Wireless Borehole Extensometer for Monitoring Convergence in Underground Mines
An extensometer has been developed to continuously monitor roof extension in underground mines. The extensometer is designed to be installed in the MSHA-mandated test holes in the roof and measures the displacement between an anchorage point at the top of the borehole and the hole in the roof of …
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Methods for Evaluating Aquifer-System Parameters from a Cumulative Compaction Record
… and water-level data were collected from an extensometer and multi-level piezometer at the Lorenzi site in Las Vegas Valley and when graphed yearly, seasonal, and daily signals are observed. Each temporal signal reflects different characteristics of the aquifer-system, including the …
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Effects of Curing Cycle and Loading Rates on the Bearing Stress of Double Shear Composite Joints
… a crosshead displacement, a strain gage and an extensometer. The crosshead displacement yielded very inaccurate results when compared to the strain gage and the extensometer.</p>
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Characterization and modeling of land subsidence due to groundwater withdrawals from the confined aquifers of the Virginia Coastal Plain
… of Virginia, high-sensitivity borehole pipe extensometers were used to measure 24.2 mm of total compaction at Franklin from 1979 to 1995 (an average of 1.5 mm/yr) and 50.2 mm of total compaction at Suffolk from 1982 to 1995 (an average of 3.7 mm/yr). Analysis of the extensometer data reveals …
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Analysis of a Multi-Aquifer System in the Southern Coastal Plain of Virginia by Trial and Error Model Calibration to Observed Land Subsidence
… from the three U.S. Geological Survey deployed extensometers in the regions, along with cyclical piezometer data, reflect the nature of the complex multi-aquifer/aquitard system in the Coastal Plain. Franklin, Virginia and Suffolk, Virginia extensometers were deactivated in 1995 and were …
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Fatigue Performance of Brass Light Pole Couplings
… Ktb, was determined to be 9.0 by use of an extensometer across the notch and a strain gauge on the nominal section. Fatigue tests were also performed on CDA 360 brass notched specimens of the second design in full compression-tension reversal using force control. An elastic …
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The measurement of static deflections in spur gear teeth
… deflections using an unbonded strain gage as an extensometer. The combined deflection of the gear tooth and the gear body was measured. More than one tooth-pair was in contact during which of the arc of contact. Timoshenko and Baud (1) in 1926 and Wulker (5) in 1938 measured deflection of gear …
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Fiber fracture in continuous-fiber reinforced composite materials during cyclic loading
… change using conventional techniques (e.g. an extensometer) because the damage and failure process destroys the integrity of the contact between those devices and the material, under cyclic conditions. This investigation presents the findings of a fiber-based investigation of unidirectional …
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GPS Monitoring and Land Subsidence in the Houston Metropolitan Area
… observations from approximately 200 GPS and 13 extensometer stations indicate that the southeast Houston area has ceased subsiding at historic rates (< 3 mm/year) as a result of groundwater withdrawal regulations, but to the north and in western portions of the Houston metropolitan area …
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An investigation into stent expansion using numerical and experimental techniques
… subsequent deformation recorded using a video extensometer. The Driver stent was numerically modelled with a strut thickness of 0.09 mm and an overall length of 9 mm such that each modular element had a length of 1 mm. The material for the stent was described using an elasto-plastic material …
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Diffraction Studies Of Deformation In Shape Memory Alloys And Selected Engineering Components
… the macroscopic stress-strain behavior (from an extensometer or an analytical approach) with the texture, phase volume fraction and strain evolution (from neutron diffraction spectra). For the case of shape memory NiTi, the macroscopic connection was made with the texture and strain evolution due …
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Effects of Sex, Strain Rate, and Age on the Tensile and Compressive Material Properties of Human Rib Cortical Bone
… the tension coupons and compression samples. An extensometer was used to measure displacement within the gage length of the tension coupons and a deflectometer was used to measure displacement of the compression samples. Tension data were obtained from fifty-eight (n = 58) coupons at 0.005 …
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Mechanical property and meso-structure assessment of Ti6Al4V parts as a function of high-speed selective laser melting practice (Additive Manufacturing)
… rate of 10-3 /s in conjunction with a video extensometer for more accurate results. Specimens were loaded in tension with force of approximately 20 000N. The results indicated that there is no significant influence of high scan speed on the tensile properties of the material tested as there …
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Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste
… for fresh and old wastes. A total of 8 magnetic extensometer settlement arrays and 4 thermocouple arrays were installed in old wastes. The settlement and temperature data were collected for an approximate duration of 1 year. In addition, laboratory experiments were conducted to determine the …
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Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites. Compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites
As a preliminary stage of the present study, the physical and mechanical properties of polypropylene nanocomposites (PPNCs) supplied by Queen’s University Belfast were evaluated. Subsequently, polymer/clay nanocomposite materials were produced at Bradford, where mixing and processing routes were …
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Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites. Compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites
As a preliminary starting point for the present study, physical and mechanical properties of polypropylene nanocomposites (PPNCs) for samples received from Queen's University Belfast have been evaluated. Subsequently, polymer/clay nanocomposite material has been produced at Bradford. Mixing and …