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 9 of 9 for “"Nonlinear Fracture"”.
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Fracture characterization of cortical bone at the micrometer and nanometer length scales
Fracture in bone is common in a wide variety of health situations, and is of particular interest to structural engineers due to the adaptability of bone tissue in response to applied stresses. Investigations into the fracture processes within bone tissue can aid in developing medical therapies to …
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Towards fracture mechanics-based design of unbonded concrete overlay pavements.
… mechanistic models. To overcome the limitations, fracture mechanics concepts, specifically the finite element method-based cohesive zone model (CZM), are introduced in this research as a new paradigm for analyzing UBCOs with the ultimate goal of establishing a more rational design procedure. …
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Mechanics and subcritical cracking of FRP-concrete interface
… exist within the FRP-concrete interface, making fracture mechanics a more appropriate tool to evaluate the integrity of the FRP-concrete interface. Analytical solutions of energy release rate (ERR) and its phase angle at the tip of a crack along the FRP-concrete interface are obtained. Under the …
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The influence of high performance matrices on fracture behavior of concrete
… strength of concrete, but its contributions to fracture behavior remains unclear. In this study, the influence of replacing cement by silica fume and fly ash on the cement matrix-coarse aggregate interfacial bond, compressive stress-strain behavior and fracture behavior of concrete is …
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Multiscale characterization of mechanical and fracture properties of cortical bone specimens
… to a whole bone at the macroscale. Several fracture testing methods are available including the three-point bending test, the compact tension test and the double cantilever test. However, these methods are confined to the macroscopic scale. At the microscopic scale, Vickers Fracture …
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Interfacial stress analysis and strengh prediction of plated rc beams
… A Finite Element Analysis (FEA) based on elastic fracture mechanics is carried out first to provide a detailed study on the stress fields near the plate ends. This becomes the benchmark for the analytic solutions presented in the following chapters. A completed analytical solution is developed by …
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Three-dimensional modeling of failure in quasi-brittle materials and structures
… behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack front. Predictive models and design methodologies have to be able to reliably calculate the load capacity, or structural strength, of structures while taking into account the nonlinearity of the …
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Characterization and modeling of the stress and pore-fluid dependent acoustic properties of fractured porous rocks
… and pore-fluid dependent acoustic properties of fractured porous rocks. A new laboratory High Pressure and High Temperature (HPHT) triaxial testing system was developed to characterize the seismic properties of sandstone under different levels of effective stress confinement and changes in …
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Improved conditioning and accuracy of a two-scale generalized finite element method for fracture mechanics
… Examples of such industrial problems include fracture in engine components, structural members of aircrafts, and pipeline joints. The presence of small cracks can lead to failure of these structures, due to intense thermal and mechanical loadings. Therefore, engineering decisions regarding …