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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 21 for “"fracture criterion"”.
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Elastic-plastic fracture criterion based on the concept of strain tolerance, An
Includes bibliographical references (pages 109-111).
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A Fracture Criterion for Orthotropic Plates Under the Influence of Compression and Shear
Made available in DSpace on 2014-12-10T17:25:35Z (GMT). No. of bitstreams: 1 6604325.pdf: 2053048 bytes, checksum: de81624749afdfac6ccd32fc02cf8e83 (MD5) Previous issue date: 1965
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Fracture prediction in metal sheets
… failure modes of thin-walled structures is fracture. Fracture is predominantly tensile in nature and, in most part, is operated by the physical mechanisms of void nucleation, growth, and linkage. For ductile sheet, fracture is preceded by necking. Prediction of necking which limits sheet …
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Fracture of welded aluminum thin-walled structures
… applications. As the first step, a local fracture criterion was validated on two types of aluminum components without welds: (i) S-rails under quasi-static and dynamic axial loading; (ii) large-scale extruded aluminum panels under 4-point bending. With the fracture parameter calibrated …
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High velocity impact fracture
An in-depth understanding of dynamic ductile fracture is one of the most important steps to improve the survivability of critical structures such as the lost Twin Towers. In the present thesis, the macroscopic fracture modes and the fracture mechanisms of ductile structural components under high …
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EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL
… tip, which leads to high stress that causes the fracture of the material. Thirdly, we developed a predictive fracture criterion for this material. We loaded the specimen with an edge crack to fracture under two loading conditions: constant applied stress (creep) and constant stretch rate. The …
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Modelagem de fratura dúctil em colisão de embarcações utilizando modelo de dano de Lemaitre modificado
… to simulate numerically the material’s ductile fracture, several failure criteria have been applied. With this perspective, thi3s article considers a new approach for the application of numerical analysis to ship collision and stranding, based on the Continuum Damage Mechanics (CDM), where new …
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Crack Path Predictions Under Mixed Mode Loading In Aero-Structures: Measurements and Analysis
… (SCG) in ductile materials. Understanding such fracture events in ductile materials is an important component of structural integrity analysis for ductile structures, especially since there are no general fracture criterion available to predict the direction and onset of mixed mode fracture in …
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Postbuckling Analysis of Delaminated Composite Plates Under Compression (Composite Laminates)
… during postbuckling. Based on a critical mode-I fracture criterion, delamination stability is also investigated.
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Finite element assisted prediction of ductile fracture in sheet bulging of magnesium alloys
… introduce a range of failure that will predict fracture over a range of draw depths rather than a single depth. It is difficult to make the leap from a process that is unpredictable to pinpointing the exact point of failure. It is more logical to firstly determine a range of formability where …
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Stochastic J-integral and realiability of composite laminates based on a computational methodology combining experimental investigation, stochastic finite element analysis and maximum entropy method
… thesis concerns itself with the stochastic fracture behavior and the reliability of laminated composites. A computational approach combining the Stochastic Finite Element Method (SFEM), the Maximum Entropy Method (MEM), and experimental investigation has been developed. Using this approach, …
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Hydraulic fracturing through 3D printing and lattice modelling
… 3D printed specimens are successfully fractured by the split Hopkinson pressure bar (SHPB) system for investigating the dynamic crack propagation and coalescence. In addition to the high accuracy and flexibility in specimen preparation, the desired fracture paths captured by the …
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Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A
This work examines the fracture behavior of additively manufactured (AM) thermosetting resins to enable rapid production of lightweight and functional polymeric and composite materials that can meet a wide range of applications. Specifically, the role of print orientation on the quasi-static and …
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Numerical analysis of a shear ram and experimental determination of fracture parameters
… the Impact and Crashworthiness Lab's (ICL) fracture methodology, the backbone of which is the Modified Mohr-Coulomb (MMC) fracture criterion. Nine cases which involve three different angles defining the sharpness (cutting angle) and three angles characterizing the shape of the blades are …
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Effect of non-linear loading paths on sheet metal fracture : large strain in-plane compression followed by uniaxial tension
… fuel and costs efficiency. The early ductile fracture of these materials limits their formability and crash-worthiness. A phenomenological criterion to predict ductile fracture has been developed based on a law of damage accumulation weighted by the stress state. The calibration of such a …
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Studies on the fracture and fatigue of wood
… of wood. This is particularly so in the field of fracture, which has relevance not only to the structural use of timber, but also to the important processes of machining and cutting. One of the reasons for this relative lack of knowledge concerning the fracture behaviour of wood, is that wood has …
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The Determination of Lithospheric Rheology and Long-Term Interplate Coupling in Japan: Finite Element Modeling
… faults, based on a dynamically-applied fracture criterion. The criterion for acceptability is how well a model matches observed present-day topography, gravity, and seismicity patterns. Results given below are for models that satisfy this criterion. The long-term effective elastic …
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Identification of defect locations in forged products using the finite-element method
… with a number of previously published continuum fracture criteria to predict the fracture initiation sites. For certain of the successful criteria the level of deformation at fracture has also been predicted using critical values of fracture found experimentally from an axisymmetric tensile test. …
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A scalable computational approach for modeling dynamic fracture of brittle solids in three dimensions
… proposed for modeling threedimensional dynamic fracture of brittle solids. The method is based on a combination of the discontinuous Galerkin (DG) formulation of the continuum elastodynamic problem with Cohesive Zone Models (CZM) of fracture. In the proposed framework, discontinuous displacement …
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Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks
With the traditional fracture mechanics approaches, an initial crack and self-similar progression of cracks are assumed. In this treatise, theoretical and numerical tools are developed to mathematically describe non-self-similar progression of cracks without specifying an initial crack. A …
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