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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"failure surface"”.
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Sliding of gravity retaining wall during earthquakes considering vertical acceleration and changing inclination of failure surface
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1979.
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Static and Seismic Stability of Cut Slopes in Terms of Reliability
… overconsolidated clay considering progressive failure as the critical failure mode. The stress condition along a potential failure surface both prior to and after an excavation is investigated by finite-element elasto-plastic analysis; in this process, a potential failure surface is modeled as …
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Premature cleavage of ship plating under reversed bending
… ship plating were tested and on that basis a 3-D failure surface was constructed for the AH36 steel, suitable for practical applications. The failure surface was formed in terms of compressive pre-strain, temperature, and reverse tensile strain. As-rolled plates pre-strained by -0.43 at room …
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Biologically Inspired Mechanisms for Burrowing in Undersea Substrates
… stress imbalance within the soil creates a failure surface around the clam, within which particles can freely move and fluidize, and outside of which the soil remains static. Theoretical derivations and experimental results demonstrate that the location of the failure surface can be …
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Probability analysis of slope stability
… of safety approach to reduce the risk of slope failure. However, the factor of safety approach cannot quantify the probability of failure, or level of risk, associated with a particular design situation.;A probabilistic approach to studying geotechnical issues offers a systematic way to treat …
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A Critical Evaluation of Computational Fracture Using a Smeared Crack Approach in MPM
… of the smeared crack representation of material failure using the material-point method (MPM) as a feasible computational failure approach is performed. The spatial descretization in MPM is defined by a grid of cells that represent space and a set of points that represent the deformable solid. A …
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The fatigue ageing of vulcanised rubbers
… cause of the respective rough and smooth fatigue failure surfaces of Neoprene GS : Neoprene W and Neoprene GS : natural rubber vulcanisates is investigated. The contrasting morphology of the vulcanisates is found to be the major factor determining the fatigue behaviour of the blends. Neoprene GS …
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An experimental method for visualizing undrained shearing failure in a transparent soft clay surrogate
… non-invasive testing procedures to visualize the failure surface of four laboratory shear-testing techniques in a soft clay surrogate, Laponite RD, at shallow depths with minimal boundary effects. The thesis developed a procedure for tracking deformation in Laponite RD as a soft clay surrogate for …
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Failure strength and mechanism of composite laminates under multiaxial loading conditions
An experimental study of strength and failure behavior of orthotropic G-10 glass fiber reinforced composite laminates in an in-plane stress state has been conducted. Different types of biaxial specimens and associated test fixtures were developed and employed in the study. Standard IITRI specimens …
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Analysis of a reinforced concrete beam in torsion
… different schemes of reinforcing were tested to failure in pure torsion. SR⁻⁴ strain gages were used to measure the concrete strains at the surface of the test beams. A review of analytical and experimental studies in the literature is presented and briefly discussed. The test results were then …
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Strength of transversely isotropic rocks
… (AMN) criterion to characterize the failure of transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three principal stresses. As such, anisotropic …
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Levee Stabilization Design for Flood Control in East Grand Forks, Minnesota
… system using the method of slices. An assumed failure surface was drawn and divided into vertical slices, where the forces acting on each slice were analyzed. If the forces available to resist movement were greater than the forces driving movement, the slope was considered stable (Rahn 1996). A …
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Site characterization using drone based photogrammetry
… Colorado. The purpose of these surveys was for failure surface identification of a historic wedge failure, structural domain segregation of the remaining rock slope, and rock mass characterization of the segregated structural domains. The study site is composed of a heavily jointed interlayered …
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Structure-Property Relationships and Adhesion in Polyimides of Varying Aliphatic Content
… the qualitative adhesion strength behaviors, the failure surface analyses, and to offer an understanding of the adhesive chemical structure-physical property relationships. These understandings provide a conclusion that the incorporation of aliphatic segments into the polyimide chemical structure …
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The engineering geology and stability of the rapidly alternating limestone and mudrock sea cliffs of glamorgan
… exploited and the cliffs undermined. Principal failure modes recognised were toppling and vertical translation. <br/>Thermal gravimetry indicated allotropy of sulphide minerals. The least stable forms were identified in the more calcareous mudrocks, and a laboratory leaching experiment …
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ΓΕΝΙΚΕΥΜΕΝΑ ΚΡΙΤΗΡΙΑ ΑΣΤΟΧΙΑΣ ΑΡΧΙΚΩΣ ΑΝΙΣΟΤΡΟΠΩΝ ΕΛΑΣΤΙΚΩΝ ΜΕΣΩΝ ΜΕ ΙΔΙΑΙΤΕΡΗ ΕΜΦΑΣΗ ΣΤΑ ΣΥΝΘΕΤΑ ΥΛΙΚΑ
… THE ISOTROPIC CRITERION OF THEPARABOLOIDAL FAILURE SURFACE OF REVOLUTION WAS GENERALIZED IN ORDER TO PREDICTFAILURE OF ANISOTROPIC MEDIA, AND EXTREMUM PROPERTIES OF THE FAILURE FUNCTION WERE STUDIED IN A GENERALIZED TENSOR INVARIANT FORM. VARIOUS FEATURES OF THE FAILURE CRITERION WERE …
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Constitutive relationships for agricultural soils
… model was developed based on a Mohr-Coulomb failure surface. The constitutive model developed was evaluated by simulating a triaxial test at a confining pressure of 28 kPa. Initial conditions were computed by substituting the boundary stresses into the model to determine the elastic-plastic …
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The role of frictional heating in the development of catastrophic landslides
… catastrophic acceleration, starting at incipient failure and ending a few seconds later, when the acquired displacement and velocity are such that the sliding material begins to break up into pieces. The model accounts for temperature rise in the slip zone due to the heat produced by friction, …
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FAILURE MECHANISMS OF ULTRA HIGH MOLAR MASS POLYETHYLENE SINGLE FIBERS AT EXTREME TEMPERATURES AND STRAIN-RATES
… be pseudo-brittle, plateauing, necking, and non-failure and transitions between these phases were observed within a strain-rate dependent temperature range. For low and intermediate strain rates, a temperature and strain-rate equivalence is observed: a decadal increase of strain-rate is …
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Insights into the edifice stability of oceanic volcanoes from direct shear experiments and numerical models
… depends on the individual rocks in which the failure surface forms. Using finite-element models it can be shown that the observed deformation pattern from geodetic measurements can give a first insight into the presence of major internal structures. Hence, it is evident that the internal …
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