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 100 for “"failure criterion"”.
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An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab
… analyzing its structural limits. Therefore, the failure criteria used to specify an FRL's failure limits are significant.</p> <p>Although useful formulaic methods have been developed for analyzing fiber-reinforced laminates, these calculations can be quite tedious when used in an iterative …
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Axial Capacity of Drilled Shafts
… for the proximity of the reaction shafts or the failure criterion used. No effect of the shaft dimensions is demonstrated since the dependence on shaft diameter is accounted for in the failure criterion. Caution should be exercised since few large shafts have been included.
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Development of a Progressive Failure Model for Notched Woven Composite Laminates
… and require more complex methods for predicting failure. NASA is seeking a method for predicting the damage initiation and propagation of woven fabric composites in order to utilize these materials effectively in SLS hardware. This work focuses on notched woven fabric composites under tensile …
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Laboratory investigation of fatigue endurance limits in asphalt concrete
… relates the number of loading cycles to fatigue failure with applied tensile strain and initial stiffness of material. This study determined the FEL of two HMA mixtures, SP-II (coarse mix) and SP-III (fine mix), using the phenomenological approach as well as a fundamental energy based approach, …
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Analytical and numerical studies on mismatch strain related problems
… analyzed: self-assembling of polymer thin film, failure of nanotube and nanorod silicon anodes in lithium batteries and modified failure criterion for earthquake distribution along the earth depth. The first chapter discusses analytical and experimental results of self-assembling of thin films …
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Edge caps for reinforcing composite laminates
… are evaluated. A three-dimensional composite failure criterion and finite element analysis are used in a progressive laminate failure analysis to predict the failure load of the reinforced luminate. The results of an experimental program are presented. Cappad laminates are shown to be on …
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Deformation and fracture of polycarbonate and rubber-modified polycarbonate under controlled temperature, deformation rate, and notch stress triaxiality
… begins to travel into the grip region, ductile failure occurs due to extensive stretching. The fracture is surface initiated. The load at yield is shown to be dependent on temperature and displacement rate. The load at yield increases with increasing strain rate and decreases with increasing …
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Slope Stability of the Hunter Creek Formation: A Geotechnical Investigation Near Mogul, Nevada
… deltaic, and lacustrine facies. Numerous slope failures have occurred in the unit mostly along streams, canals, and the Truckee River. Field mapping showed that most of the slope failures occur south of Interstate 80 between Verdi and northwest Reno, Nevada.Four landslides were studied and …
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ΓΕΝΙΚΕΥΜΕΝΑ ΚΡΙΤΗΡΙΑ ΑΣΤΟΧΙΑΣ ΑΡΧΙΚΩΣ ΑΝΙΣΟΤΡΟΠΩΝ ΕΛΑΣΤΙΚΩΝ ΜΕΣΩΝ ΜΕ ΙΔΙΑΙΤΕΡΗ ΕΜΦΑΣΗ ΣΤΑ ΣΥΝΘΕΤΑ ΥΛΙΚΑ
… TENSOR COMPONENTS. IN THE SEQUEL, 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 …
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Multiscale Integration of Empirical Geologic Observations with Quantitative Structural Modeling to Constrain Late Cretaceous to Eocene Paleostress Environments on the Colorado Plateau
… of interest to the geologic community as rock failure has important implications for storage and extraction of petroleum and mineral deposits, as well as sequestration efforts. The ability to relate patterns of rock deformation to stress conditions also permits geologists to better understand …
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A fracture-based approach to understanding debonding in FRP bonded structural members
… approach was developed to describe the system failure by means of a global failure criterion. Modeling and evaluation studies confirm the potential of fracture mechanics approach for analysis and design of FRP-RC and FRP-steel systems against debonding failures.
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Numerical Simulation of Reinforced Concrete Subjected to Multiaxial Stress Conditions
… dimensional nonlinear constitutive relations and failure criterion for concrete subjected to short term monotonic loading; (2) crack modeling in concrete; (3) interface stress and stiffness transfer across the crack; and (4) finite element implementation of the findings into an integrated program. …
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Modeling of textile based composite materials
… for interrogation of the elastic and progressive failure response of textile based composite materials has been developed and implemented. The geometrically thorough textile geometry model is used as the basis for creation of the geometry used for the finite element analysis. A detailed assessment …
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Finite element models for predicting crack growth characteristics in composite materials
… load level for crack extension and two new failure theories, modifications of the point stress and the Hashin failure criteria, are proposed to predict the direction of crack extension in composites. Comparisons are made with the Tsai-Wu failure criterion and the Sih strain energy density …
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Nonlinear temperature dependent failure analysis of finite width composite laminates
… in cross-ply laminates. The tensor polynomial failure, criterion is used to predict the initiation of failure, and the failure mode is predicted by examining individual contributions of the stresses to the polynomial.
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Analytical and numerical prediction of localized necking in sheet metal forming processes
… and numerical tools that can accurately predict failure in sheet metal forming operations. The strain-based forming limit curve (FLC) is one of the tools to predict the maximum permissible strains of thin metallic sheets which are loaded in the plane of the sheet to different states of stress. It …
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A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
… and the dilatational strain. A delayed failure criterion based on the Reiner-Weisenberg failure theory has also been implemented in the finite element code. The applicability of the proposed models is demonstrated by several numerical examples.
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Sahraei failure criteria for detection of short circuit in lithium-ion batteries
… conditions and developing predictive models for failure is essential for enhancing safety and optimizing protective structures in EVs. This dissertation presents a comprehensive analysis of Li-ion battery behavior under multiple loading scenarios, supported by two novel modeling approaches: a …
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Minimum-weight design of symmetrically laminated composite plates for postbuckling performance under in-plane compression loads
… plates for postbuckling performance. Laminate failure load used in the postbuckling regime was calculated based on a maximum strain failure criterion. The failure criterion was demonstrated to predict the failure load reasonably well when compared with available test results. Weight comparison …
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Damage Progression in Open-Hole Tension Composite Laminates by the Element-Failure Method
… damage-modeling technique known as the Element-failure method (EFM) is proposed, which assumes that the nodal forces of a finite element of a damaged composite can be modified to achieve the decrease of load-carrying capacity. The EFM is implemented to a 3D implicit finite element code to model …
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