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Showing 1 to 20 of 20 for “"mode-III"”.
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Predicting torsional fatigue crack growth (Mode III) in turbo-generator shafts
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1982
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A photoelastic technique for the determination of stress intensity factors for Mode III loading
… estimates of the stress intensity factors due to Mode III loadings from photoelastic data is developed. The results are supported by a series of stress freezing photoelastic experiments conducted on circumferentially notched round bars to which torsional loads were applied yielding a pure Mode III …
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Crack Growth Mechanisms under Anti-Plane Shear in Composite Laminates
… laminates subjected to anti-plane shear (mode III) loading. For mode III split-beam test methods were proposed, and initial evaluations were conducted. A single test method was selected for further evaluation. Using this test method, it was determined that the apparent mode III …
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An investigation into the deformation and tearing of thin circular plates subjected to impulsive loads
… mild steel plates fail with mode I (large ductile deformation), mode II (tensile-tearing and deformation) and mode III (transverse-shear) failure modes. The impulse is measured by means of a ballistic pendulum upon which the test plates are attached. During mode II and mode …
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Validation of the ULSAP Closed-Form Method for Ultimate Strength Analysis of Cross-Stiffened Panels
… and in all but 4 cases the predicted failure mode also agrees with that of ABAQUS. In one case the ULSAP predicted ultimate strength is 51% below the experimental value, and so this case is studied in detail. The discrepancy is found to be caused by the method which ULSAP uses for panels that …
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Solutions of some elastodynamic problems with application to crack propagation
… to the solutions of two-dimensional problems of mode-I, mode-II, and mode-III cracks in homogeneous solids as well as to the solution of problem of the mode-III interface crack. The technique of self-similar with a new application of rotational superposition was used to solve dynamic problems of …
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Numerical Analysis of Stable Crack Growth in Elastic-Plastic Materials in Small Scale and General Yielding
… along with the moving crack tip. Various models for plastic flow were used. In Mode III, calculations were carried out for J(,2) incremental theory and a modified J(,2) deformation theory meant to introduce effects related to flow at a yield surface vertex.
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Environmental effects on the fatigue behavior of copper nickel alloys
Mode I and Mode III fatigue tests were performed on copper nickel alloys in helium, salt water environments. The hydrogen, oxygen, two alloys used air and in this investigation were 90-10 and 70-30 copper nickel. Both alloys contained iron which was added to improve the erosion corrosion …
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An Eulerian-Lagrangian finite element method for modeling crack growth in creeping materials
… Eulerian-Lagrangian description (ELD) kinematic model is shown to have several desirable properties for modeling inelastic crack growth. Accordingly, a variational statement based on the ELD for history-dependent materials is developed and a new moving-grid finite element method based on the …
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If women write in milk, do children write in snot? Children's voices in documented drama
… methods used by the now extinct Leicestershire Mode III syllabus grow in significance. The problem of assessing the ephemeral felt experience of the drama student was accepted as an opportunity to theorise rather than sanitise through standardisation.<br/><br/>The study concludes by suggesting …
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Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness
An experimental evaluation of the mixed-mode fracture behavior of bonded composite joints is presented. Commonly used experimental techniques for characterizing the mode I, mixed-mode I/II, mode II, and mode III fracture behavior have been employed for the purpose of developing a fracture envelope …
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Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks
… an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model known in fracture mechanics as Dugdale-Barenblatt model, is adopted to represent the degradation of the material ahead of the crack tip. This model unifies strength-based crack initiation and fracture based …
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Analysis of cracks in nonlinear fiber composite materials
… fiber composites under pure single loading modes and mixed-mode loading are determined by employing an advanced finite-element method with surrounding nonlinear elements and crack-tip singular element formulations. The results reveal that in a 0$\sp\circ$-fiber composite, stresses in the …
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Finite Element Analysis of Probe Induced Delamination of a Thin Film at an Edge Interface
… to theoretical limit cases. Upon validation, mode I, mode II, and mode III energy release rates are extracted from three-dimensional continuum finite element models of the edge-loaded thin film by a three-dimensional modified crack closure method. Having assumed a circular debond as observed …
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Anti-plane Shear of Cylinders and Layered Systems: Cohesive Fracture and Instability
<p>This research examines the mechanics of mode-III cohesive fracture by defect initiation and quasi-static growth in both cylinder and layered systems. The analysis, which is exact, is based on the solution of two fundamental elasticity problems: i) a cylinder subject to an arbitrary shear on one …
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Deformation and fracture of soft materials for cartilage tissue engineering
… of the complexities of soft tissue mechanics. Mode III trouser tear tests and mode I pure shear tests were found to provide reliable measurements. Due to the ease of testing small samples, trouser tear testing was concluded to be the most advantageous for determining the fracture resistance of …
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Constraining calving dynamics of marine-terminating glaciers: Developing 4D data of Store Glacier, Greenland, from repeat UAV photography
… were compared and reveal the influence of both Mode I and Mode III fracturing in the formation of crevasses across Store Glacier’s snout, with mixed mode fracturing also being common in some regions. But, the basal topography of the bed and overdeepening below Store Glacier may also play a key …
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Failure of Martensitic Sharp Edges: A Micro-Mechanical Exploration for Design Guidelines
… mechanical factors governing failure: (i) large mode III component in the stress, (ii) particular position of the hair relative to an asperity along the sharp edge, and (iii) presence of spatial variation of the heterogeneous lath martensite structure along the sharp edge. Combination of these …
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Three-dimensional numerical analysis of reflective cracks in airfield pavements
… The analysis of reflective cracking involves all modes of fracturing i.e., Mode I (opening), Mode II (shearing), and Mode III (tearing) [61] and thus 3-D models are required. The need for true 3-D modeling of reflective cracking complicates the development of computational models using standard …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
… an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model known in the fracture mechanics literature as the Dugdale-Barenblatt model, is adopted to represent the degradation of the material ahead of the crack tip. This model unifies strength-based crack initiation …