Global ETD Search
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 35 for “"stress-strain relationship"”.
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An Investigation of Mentoring and Hardiness in the Stress-Strain Relationship
… the role of personality and mentoring in the stress-strain relationship. Role conflict was examined as an organizational stressor and job satisfaction and organizational commitment were examined as strain variables. The personality construct of hardiness and presence of a mentor were examined …
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Stress-Strain Behavior for Actively Confined Concrete Using Shape Memory Alloy Wires
… material being able to recover large inelastic strains with the application of heat. Due to the extraordinary behavior that these SMAs display, this confining method is classified as “active confinement”, which has been proven to be superior in almost every way to the ordinary passive …
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Effect of in situ stresses on the stress analysis in soils by the finite element method
The effect of in situ stresses on the stresses and displacements in soils was investigated by the finite element method. The soil was considered as a nonlinear elastic media having a hyperbolic stress strain relationship. Isotropic and cross anisotropic media were considered in the analysis. Also …
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Material Modeling Through Inverse Analysis
… to extract Red Blood Cells (RBCs) material stress-strain behavior from measurements of forces and displacements obtained by optical tweezers techniques. Deformation characteristics of RBCs are closely linked to disease (e.g. malaria) progression and hold promise as a tool for disease …
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The Development of the Strength Index Method and Protocol for Assessing the Use of Solid Waste Materials in Concrete
… portland cement (control) at all test ages. The stress-strain relationship for the BP and CR concretes were not as stiff as the control concrete but DU and LM concretes exhibited equivalent stiffness as the control concrete. All concrete specimens exceeded the minimum freeze-thaw requirements for …
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A finite strain theory, and its application to the plane stress response of polyurethane
… the conventional manner of the generalized plane stress problem of linear elasticity. However, the strain displacement relations are formulated in the Eulerian manner and the displacement gradients are not assumed to be small. In addition, a more general stress~strain relationship than the …
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Applications of trilinear coordinates to some problems in plane elasticity
… are defined. The concepts of triaxial stress, strain, bending moments and curvature are introduced: utilizing these concepts, the stress-strain relationship, moment-curvature relationship and a few other basic equations of two dimensional elasticity are developed for an isotropic …
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Design of a hydraulic bulge test apparatus
… was also derived. Two methods of deriving the stress-strain relationship in the material were also proposed. The first method uses the optical measuring system to determine displacement and surface strain distribution. The second method uses geometrical approximations and dome height …
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Characterization of Material’s Elastic-plastic Properties Through Microindentation Testing with a Cylindrical Flat-tip Indenter
… to find the elastic modulus, yield strength, stress-strain relationship. The tensile testing data are used when comparing tests done on the micro scale for validating the proposed method. A computer model is developed based on finite element analysis for microindentation. Software used in …
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BODY TENSOR FORMALISM IN FINITE DEFORMATION ELASTICITY AND APPLICATION TO THE TORSION OF A CIRCULAR CYLINDER
… and the constitutive equation which relates the stress to the strain with the help of the two Lame coefficients and the three third order elastic constants. Although the body tensor formalism has been used before to describe finite deformation elasticity, it has not been used to generalize the …
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Interação solo-estaca de plataformas offshore
… API Code through the "P-Y" curves, defines the stress-strain soil characteristics for laterally loaded piles. Although, the stress-strain relationship for axial behaviour is not well defined by the Codes, a set of curves called the "T-Z" curves, are used in the Analysis of Axially loaded piles. …
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Quantifying the compressive ductility of concrete in RC members through shear friction mechanics.
… friction 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 …
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Finite element analysis of multipass effects of vehicles on soil compaction
… with an equivalent circular area. A hyperbolic stress-strain relationship was used to model the nonlinear material characteristics of the soil. The boundary load conditions were based on contact area and contact pressure data for a standard tire. The finite element program developed was verified …
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Characterization of nonlinearity parameters in an elastic material with quadratic nonlinearity with a complex wave field
… half-space with a quadratic nonlinearity in its stress-strain relationship. Different boundary conditions on the surface are considered that result in both one- and two-dimensional wave propagation problems. The goal of the research is to examine the generation of second-order frequency effects …
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Uniaxial and triaxial behavior of high strength concrete with and without steel fibers
… study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial …
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Numerical analysis of cables in the offshore environment
… cable winding configuration causes a nonlinear stress-strain relationship, it's sagged geometry results in nonlinear strain-displacement relations, and the immersion in water leads to nonlinear fluid loadings arising from Morison's Equation as well as uncertainties in the fluid parameters. …
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Implementation of a non-linear eddy viscosity turbulence model into Hydra-TH for fuel related applications
… This model adopts a non-linear extension of the stress-strain relationship that allows it to capture the anisotropy of flow conditions. Modeling this behavior is essential for the accurate simulation and prediction of the flow profile in fuel rod arrays, where secondary flow vortices arise and …
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Stability of the Shoulder Complex during Manual Exertions
… previous studies have reported a significant stress-strain relationship for the shoulder complex during physically demanding exertions, a clear assessment method to evaluate the risk of injury to the shoulder complex currently does not exist. The objective of this study was to develop and …
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THEORETICAL DETERMINATION OF THE YIELD CURVE FOR UNSATURATED SOILS
… stages. The implication of misalignment on the stress-strain relationship of soils during triaxial testing is investigated. In addition, a study of the requirement of point density in image-analysis methods during triaxial testing is presented. Finally, the Modified State Surface Approach (MSSA) …
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High strain rate properties of structural aluminium.
… have been used in the past to determine the stress-strain relationship of metals and alloys at high strain rates of up to 2.2 x 10 per second; some of these were approximate whilst others required expensive equipment. In the present study three aluminium alloys, HE15, HE30TF and DTD5044 have …
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