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Showing 1 to 20 of 88 for “"Strain Gages"”.
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Characteristics of electric strain gages at low temperatures
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1946
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The dynamic response of a flexible three-link robot using strain gages, Lagrange polynomials, Fourier series, and the finite element analysis
… polynomials are functions of the elastic strain at three specific locations on each link. Strains are converted to voltage differentials and are read into a micro-computer through an A-to-D board system, where they are converted to digital strain values. Coefficients defining the damped …
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A comparison of the stresses in the crankshaft of an internal combustion engine as determined by using electrical resistance strain gages and by analytical methods
… combustion engine, electrical resistance strain gauges were applied to the accessible parts of the crankshaft of a single-cylinder gasoline engine to sense the actual operating strains. From the recorded strains the operating stresses were determined and were compared to the analytically …
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Fatigue of Concrete Beams and Slabs
Strain gages, attached to all specimens tested, indicated cracking in concrete occurred in a narrow band. Regions of high plastic strain were found in the plane of cracking, while adjacent areas experienced decreases in strain levels with cracking. Strain gages indicated cracking in concrete slabs …
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Development and Ground Testing of Direct Measuring Skin Friction Gages for High Enthalpy Supersonic Flight Tests
A series of direct-measuring skin friction gages were developed for a high-speed, high-temperature environment of the turbulent boundary layer in flows such as that in supersonic combustion ramjet (scramjet) engines, with a progression from free-jet ground tests to a design for an actual hypersonic …
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Design and analysis of diagnostic machines utilizing compliant mechanisms
… ankle subjoint coupling. Cartwheel flexures with strain gages are aligned with the rotational axes and used as torque sensors. Strain gages are placed in a Wheatstone bridge circuit to mitigate environmental factors. Trials measured torque of the right ankle joint of test subjects from a standing …
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Desenvolvimento de célula de carga para medir força aplicada durante a escovação dental
… dental. A célula de carga foi construída com 2 Strain Gages montados em meia ponte de Wheatstone, medindo força em flexão, e 4 Strain Gages montados em ponte completa de Wheatstone medindo força de torque. A aquisição dos dados e análise foi feita através do software SAD2. Foram selecionados 6 …
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Determination of stress concentration factors using experimental methods
… are performed on a chosen 2-D specimen using strain gages, brittle coating, brittle specimen failure, photoelasticity, and Moire interferometry. Results are compared to each other and to finite element analysis performed on the same geometry. Strain gaging and photoelasticity were chosen as …
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Development of Residual Stress Measurement for Concrete Pavements through Cantilevered Beam Testing
… research was inspired by the hole-drilling straingage method used in metals. This method involves drilling a small hole into the specimen and measuring the resulting stress relaxation near the hole with strain gages. The strain change is then used to calculate the residual stresses in the …
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… diffraction residual stress analysis and dynamic strain measurements using strain gages before and after laser trimming. X-ray diffraction measurements were carried out in both the longitudinal and transverse directions on the front and back sides of the substrates. The dynamic strain measurements …
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Floating head skin friction gage measurements in supersonic flows
Two floating head skin friction gages have been designed and tested to directly measure the skin friction coefficient for the undefined flow in a SCRAM-jet engine. The skin friction gage designs contain a floating head that is supported by ball bearings which allow it to move in any horizontal …
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A Novel Approach to Residual Stress Measurement
… thesis provides an authentication of a novel strain measurement and residual stress calculation method. This method is heavily rooted in the fields of optical strain measurement and elementary solid mechanics. The types of measurements discussed involve using two specialty optical strain gages …
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Torsional stress concentration factor for hollow stepped shafts
… wall thickness and two fillet sizes. Electric strain gages of the SR-4 type were employed to measure strains in the fillet section. Values of the stress concentration factor were determined with the ratio of inside to outside diameter ranging from 0.25 to 0.625. A decreasing relation was …
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Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS)
… employing Wireless Smart Sensors (WSS). Wireless strain gages installed in the rail measured real-time trainloads and speeds, while wireless accelerometers and magnetic strain gages measured associated bridge responses. The sensing system was deployed and validated on multiple railroad bridges in …
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Model Validation for a Steel Deck Truss Bridge over the New River
… of lacing effects on built up member strain detection, live load testing of a steel truss bridge, and evaluating modeling techniques in comparison to recorded data. Before any live load testing could be performed, it was necessary to confirm an acceptable strain gage layout for …
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An actively cooled floating element skin friction balance for direct measurement in high enthalpy supersonic flows
… is the use of a quartz tube cantilever with strain gages bonded at orthogonal positions directly on the surface at the base. A symmetric fluid flow was developed inside the quartz tube to provide cooling to the backside of the floating head. Bench tests showed that this did not influence the …
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Background for finite element analysis and experimental testing of glued-laminated space beams
… of the beam element are obtained experimentally. Strain measurements in wood with small bonded strain gages are not accurate. A simple clip-type transducer is fabricated and used to measure the strains in the test glulam beams. The distribution of normal stresses is investigated for symmetrically …
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Theoretical and experimental analysis of strain concentration around a broken fiber using the macro-composite technique
… predetermined location and then measure the over-strain experienced by the neighboring rods. A finite element model was used to validate the micromechanical analysis. Quantitative measurements of perturbed strain fields were measured with embedded strain gages which were then compared with the …
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Behavior of Laterally Loaded Shafts Constructed Behind the Face of a Mechanically Stabilized Earth Block Wall
… pressure cells, 16 inclinometer locations, 112 strain gages, 20 tell tales, 84 photo measurements of the wall facing, and load cells and LVDTs associated with lateral load and response.
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The Effect of Phase Transformation on The Fatigue Crack Growth Rate of Austenitic Stainless Steels Tested in Argon and Hydrogen Atmospheres
… stress around the crack tip was measured using strain gages. The volume fraction of martensite was determined by measuring the magnetic permeability and by using quantitative metallography. The phase present along the path of the fatigue crack was determined by using glancing incidence electron …
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