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 38 for “"Axial stress"”.
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Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
Previous investigations into fatigue under multiaxial stress, and also cumulative damage under uniaxial stress, are discussed in conjunction with the parameters relevant to the present experimental investigation. A biaxial fatigue machine is described which can subject thin wall tubes to …
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Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
Under combined axial-stress/external-pressure loadings, a solid specimen experiences a truly three-dimensional, homogenous stress state comprised of a uniform axial stress in conjunction with radial and circumferential stresses equal to the negative of the pressure, -P. Through independent computer …
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Molecular Mechanics Simulations of Instabilities in 3D Deformations of Gold Nanospecimens
… simple tension/compression, and triaxial tension/compression. The criteria used to delineate local instabilities in a system include the following: (i) a second order spatial derivative of the displacement field having large values relative to its average value in the body, (ii) the …
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Modeling Interfacial Slag Layer Phenomena in the Shell /Mold Gap in Continuous Casting of Steel
… increase in the solid slag layer. When the shear stress exceeds the slag shear strength before the axial stress accumulates to the fracture strength, the slag could shear longitudinally inside the layers.
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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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Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials
… hypothesis of the association between critical stress and critical interfacial strength, but also offer a new method to determine the true strain/stress behavior during deformation. This method is called the Universal Micro-structural Geometry-corrected Model (UMGM) in this dissertation. Due to …
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Nonlinear Viscoelastic Behavior of Ligaments and Tendons: Models and Experiments
… form ligaments and tendons was investigated. Axial stress-stretch data and stress relaxation data at different axial stretches were collected by testing rat tail tendon fascicles. The experimental results demonstrated, for the first time, that the shape of the normalized axial stress …
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Comparison and Correction of Multistage Triaxial Tests to Single Stage Triaxial Test for the Rock Mechanical Testing
… between two test protocols; the Single Stage Triaxial (SST) is where a constant confining stress is applied and the axial stress is raised until the sample fails. This is compared to the Multistage Triaxial (MST) test, where the sample is loaded to the point of positive dilatency (PPD) then …
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On The Shear Strength Of Partially Grouted Concrete Masonry
… boundary conditions, aspect ratio, initial axial stress and specimen size. The shear capacities of the walls were compared against the predicted shear from four empirical equations. The sensitivity of the initial stiffness and different methods for calculation of ductility are discussed in …
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Mechanical Investigation of Damage in Ligaments
… nonlinearity in the toe region of the tensile axial stress-strain curve. Straight collagen fibers behave as a linear elastic material. The gradual damage of collagen fibers determines the nonlinearity in the failure region of the tensile axial stress-strain curve. The parameters in the …
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Analysis of Composite Laminates with Matrix Cracks
… of effective laminate properties, such as axial stiffness, Poisson's ratio, shear modulus, and coefficient of thermal expansion, as a function of crack density and the axial stress redistribution due to the existence of matrix cracks. Both transverse cracks (2-D problem) and cross …
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Multiscale Computational Framework for Analysis and Design of Ultra-High Performance Concrete Structural Components and Systems
… response, and extends a structural-level triaxial continuum constitutive law to account for the addition of discrete fibers. The approach is robust, general, and could be utilized by other researchers to expand the computational capability and simulate the behavior of different composite …
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Inelastic Analysis of Tripping Failure of Stiffened Steel Panels due to Stiffener Flange Transverse Initial Eccentricity
… strength of stiffened panels under compressive axial stress. The current methods involve the use of a bifurcation, or eigenvalue, approach to predicting failure stress. The effects of initial transverse eccentricity of the stiffener are ignored using such a method. Six panels were modeled and …
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A study of the mechanical behavior of particle filled elastomers
… 15%, and 20% volume fractions on the macroscopic axial stress vs. strain behavior and the microscopic strain and stretch of the matrix material are studied when the composite material is subjected to tensile and compressive uniaxial loading. The matrix material is taken to be chloroprene rubber. …
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Guided Waves Technique for Measurement of Contained Stress in Uniform Slender Elastic Bodies
… and accurate methods for in situ measurement of axial stress in slender elements, especially in the circumstances where only a small span of the total length is free from the loads and supports. A new method for in situ contained stress measurements, based on the change of dynamic flexural …
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Responsive temperature and pressure sensor design for in-situ prosthesis monitoring applications based on the piezoelectric and pyroelectric effects in lead zirconate titanate
… can be used to measure both temperature and/or axial stress for specific use within a prosthetic socket, and more generally as a responsive temperature sensor capable of detecting high frequency skin temperature oscillations in medical diagnostic applications. Knowledge of an amputees' residual …
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The long-term behaviour of butt fusion welds in polyethylene pipeline systems
… constant pressure is reduced by the presence of axially misaligned butt welds. The second objective was to examine fracture initiation sites and crack propagation paths of the failed aligned and misaligned butt welded samples in relation to the melt flow zone and the weld bead in order to …
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Development and Application of Simplified and Advanced Modeling Procedures for Timber-Concrete Composite Structures
… closed-form equations are derived to approximate stress distributions in notched connections, accounting for nonlinear and multi-axial stress conditions in concrete. These equations form the basis of a simplified analytical model proposed for predicting the load-carrying capacity and failure mode …
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Anisotropic ductile fracture of metal sheets : experimental investigation and constitutive modeling
… deformation and ductile fracture under multi-axial loading is highly relevant to various industrial applications such as metal forming, impact failure of structures, etc. In this thesis, a comprehensive study of the plasticity and ductile fracture of anisotropic metal sheets is presented, …
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Thermo-Mechanical Behavior of Energy Piles: Full-Scale Field Testing and Numerical Modeling
… employment in heat exchange operations, causes axial displacements, thermally induced axial stresses and changes in mobilized shaft resistance which may have possible effects on their behavior. In order to investigate these effects, an extensive field test program, including conventional pile …
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