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Showing 1 to 20 of 44 for “"Axial Strain"”.
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Axial strain effects on optical fiber mode patterns
Axial strain effects in multimode fibers are studied. A few-mode fiber is mounted on a tensile testing machine and strained at various speeds. The output of a monochromatic light source passing through it is monitored and recorded. Relations are noted between the light output the magnitude of …
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Temperature and Axial Strain Rate Effects on Micromechanical Behavior in Triaxially Compressed Marbles
A series of high resolution, simultaneous stress-axial strain, volumetric strain, and acoustic emission measurements were used to survey the effects of temperature (T) and axial strain rate ((epsilon)) variations on micromechanical behavior in triaxially compressed marbles. Thirty-five tests were …
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Multi-axial strain monitoring of fibre reinforced thermosetting plastics using embedded highly birefringent optical fibre Bragg sensors
… conventional isotropic construction materials. Strain monitoring of an in-service structure should greatly enhance the insight and confidence in the (long-term) behaviour of high performance composite structures. Structural health monitoring necessitates the possibility of measuring multi-axials …
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Engineering properties of Resedimented Ugnu Clay from the Alaskan North Slope
… petroleum exploration. Thirteen constant rate of strain (CRS) tests were performed to ascertain the compression properties as a function of consolidation stress. Consolidation stress for these specimens ranged from 6,800 kPa to 39,000 kPa. CRS results show that the compression ratio (CR) decreases …
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Properties and sensing applications of long-period gratings
… It is demonstrated that external temperature and axial strain introduce large spectral shifts in the resonance bands. A theoretical evaluation of the sensitivity reveals a strong dependence on the properties of the optical fiber, the grating periodicity, the order of the cladding mode, the writing …
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Cyclic Properties of Natural Soil Containing Pumice Particles
… a comprehensive set of undrained cyclic triaxial tests were performed on undisturbed and reconstituted NP sands and reconstituted Toyoura sand with different relative densities. It was found that the reconstituted NP specimens showed significantly different cyclic behaviour compared with …
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Nonlinear temperature dependent failure analysis of finite width composite laminates
… due to mechanical loading in the form of an axial strain are calculated using tangent modulus, obtained by Ramberg Osgood parameters. It is shown that curing stresses are significant only as edge effects in angle-ply laminates, and severe throughout the laminate in cross-ply laminates. The …
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Experimental analysis of the post-failure behavior of coal and rock under laboratory compression tests
… methods and one method in particular is the Uniaxial Compressive Strength of the rock, which is commonly adopted as the standard strength indicator. However, in-situ behavior by past researchers have shown that rock and coal show significant residual strength contrary to the failure path …
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Numerical Analysis of Optically-induced Long-period Fiber Gratings for Sensing Applications
… surrounding environment such as temperature, strain and ambient refractive index, LPGs can be used for sensing. However, traditional LPGs with gratings inscribed in the fibers can only sense a single point and cannot be used for distributed sensing. Although new ideas were proposed to use …
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Thermal and Mechanical Response of Curved Composite Panels
… stresses, which are induced by mechanical restraints against thermal expansions or contractions, cause buckling and postbuckling panel responses. Panels with three different lamination sequences are considered, including a quasi-isotropic laminate, an axially soft laminate, and an axially …
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Rate Effect Behaviour of Different Clays from High Speed Triaxial Element Testing
… clays has been studied using high-speed triaxial element testing at axial strain rates up to 100,000 %/hr. Strain rate effects lead to increasing soil shear strength in fine grained soils under undrained conditions and are important for accurate predictions in a number of geotechnical …
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Mode-mode interference in optical fibers: analysis and experiment
… output pattern to demodulate the information. Axial strain has been chosen as the modulating mechanism in experiments designed to quantify mode-mode interference effects. Quasi-statically varying strain as well as vibrational strain was used to study 'dc' and 'ac' mechanisms. Specific mode …
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Axial compressive behaviour of FRP-confined high-strength concrete
… shown to lead to significant improvements on the axial compressive behaviour of these columns. This application of FRP composites is effective as a confinement material for concrete, in both the seismic retrofit of existing reinforced concrete columns and in the construction of concrete-filled FRP …
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Determinação dos parâmetros "elásticos" do solo residual compactado da barragem de Itauba
Analysis of the stress-strain formulation proposed in 1974 by Corotis, Krizek and Farzin. This formulation is applied mostly to problems in which the principal total stresses (σ1, σ3) increase simultaneously mantaining its ratio constant (σ3/σ1=constant); in another words: it includes the total …
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Closed-loop controlled filament stretching and break-up of polymer solutions
A constant true (radial) strain rate filament stretching experiment has been the Holy Grail of extensional rheological studies. These experiments are performed on a Filament Stretching Extensional Rheometer (FiSER). A filament stretching experiment is the only direct way of measuring the …
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Optical fiber modal domain sensors for dynamic strain measurement
… measurements of material parameters such as strain, temperature, or state of damage. In particular, sensors based on optical fiber modal interference phenomena have been shown to be capable of highly sensitive detection of static and dynamic strain. This work reviews known applications of …
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Quantifying the compressive ductility of concrete in RC members through shear friction mechanics.
… mechanics. Firstly, the size dependent stress‐strain models for unconfined and actively confined concrete are derived based on the fundamental mechanics of shear friction theory. At this stage, the shear friction properties, that is the relationship between the shear stress, normal stress, …
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The effect of loading frequency and loading level on the fatigue behavior of angle-ply carbon/PEEK thermoplastic composites
… 0.13. During each fatigue test, the cyclic load, axial strain, and the sample's surface temperature were recorded through a data acquisition system. It was found that the fatigue life of this material decreases as loading frequency increases. At the same frequency, the fatigue life decreases as …
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Normalized mechanical properties of resedimented Gulf of Mexico clay from Integrated Ocean Drilling Program Expedition Leg 308
… using recovered Leg 308 sediment. A seven triaxial compression tests, Ko consolidated, were performed to ascertain these mechanical properties as a function of consolidation stress. Consolidation stress for these specimen ranges from 150 kPa up to 1,200 kPa. Axial strain induced on the soil …
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Evaluation of the laboratory resilient modulus test using a New Mexico subgrade soil
… a cylindrical specimen is subjected to dynamic axial stresses under confining stresses, while axial deformations are measured. By definition Mr is the ratio of the peak axial stress to the corresponding recoverable axial strain. Currently, there are two accepted laboratory testing protocols for …
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