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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 38 for “"deformation modes"”.
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Effects of deformation modes on the susceptibility of delayed fracture of advanced high strength steels
The effects of different deformation modes on the susceptibility to delayed fracture in advanced high strength steels (AHSSs) were evaluated using four types of commercially-produced sheet steels (DP780, DP980, TRIP780 and TRIP980). Specimens were strained by either uniaxial tension or bending …
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Methods development of multimodal loading under bending, compression and torsion for bench-top testing of cardiovascular stents
… and analyzing cardiovascular stents in multiple deformation modes. Testing stents in multiple deformation modes, including bending, torsion and compression simultaneously is a novel technique. Specific details are provided on strategies for inserting a stent sample into the testing apparatus such …
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Development of partial hybrid finite elements for 3-D global/local analysis of laminated composite structures
… by the, eigenvalue test to detect zero-energy deformation modes and the absence of rigid-body motion capability. The results show that the elements do not have any kinematic deformation modes, and they have a desired capability for rigid-body displacement. In addition, the non-zero eigenvalues …
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Structural analysis of geodesically stiffened composite panels with variable stiffener distribution
… used to isolate the effect of various stiffener deformation modes on the buckling load and skin deformation patterns of geodesically stiffened panels under various load combinations. The analysis routines are then coupled with the numerical optimizer ADS to create a package for the design of …
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Uncovering the link between twin-twin interactions and damage nucleation in an (α+β) Ti alloy
… most frequently in the microstructure, and what deformation modes were associated with damage nucleation. Damage within primary α grains was found to be the most common, with most of these damage incidents occurring along {10̅12} twin-twin boundaries with a ~60° misorientation. The {10̅12} …
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Lessons learned in the design and erection of box girder bridges from the West Gate collapse
… literature review presents the buckling and deformation modes found in stiffened plates under compressive loading, showing the development of understanding of these systems from papers written or published in 1997, 2001, 2004 and 2006 - over three decades after the West Gate collapse.
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Micromechanical Modelling of Wood and Fibre Properties
… wood on the basis of its microstructure. Deformations in the microstructure due to loading, as characterized by use of a SEM, was also studied. The longitudinal modulus of elasticity, three hygroexpansion coefficients and the density along the radius from pith to bark in the stem were …
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Plastic Instability Due to Collective Dislocation Effect in Portevin-Le Châtelier Effect and Dislocation Nucleation
… and dislocation nucleation respectively. The deformation modes of Cu-10at.%Al single crystal at different temperatures or loading conditions have been further studied by optical microscope and transmission electron microscope observations. The distribution of solute atoms around a moving …
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Design of an omnidirectional soft tactile sensor with applications in leak detection
… and experimental testing of soft, multi axis deformation sensors. In the first approach, various geometries of a piezoresistive rubber sensor were tested, and the soft-bodied drone for mapping the interior of pipes was demonstrated in a field test conducted in Matio, Brazil. This demo yielded …
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Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials
… in dimension and subjected to various prescribed deformation modes to generate the effective elastic tensor of the material. The RVE-calculated elastic properties such as moduli and Poisson's ratio are validated through an asymptotic expansion homogenization (AEH) and compared with rule of …
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Ruga mechanics of composite media with soft inclusions
… thesis presents an investigation for the elastic deformation of two-phase fibril composites with soft inclusions, specifically, the influence of soft inclusions on the behavior of fibrils under compressive loading. It is demonstrated that the inclusion of soft material in the fibril matrix …
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Base óptima para la deformación de modos de estabilidad en sistemas dinámicos parametrizados
… ortogonal de modos de deformación modal o eigen-deformation modes (EDMs), que captura de forma óptima la deformación de los modos de estabilidad al variar un parámetro. Para lograr esto, se utilizan herramientas de minería de datos, basadas en formulaciones matemáticas de álgebra lineal, para …
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Additive manufacturing of stiffness optimised auxetic bone scaffold using cobalt-chromium-molybdenum superalloy
… their negative Poisson’s ratio (−𝜐) leading to deformation modes and mechanical characteristics different to traditional porous architecture. This can lead to favourable outcomes for load-bearing tissue engineering constructs, such as bone scaffolds for critical-size defects. Emerging …
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Three Dimensional Characterization of Deformation Twins Using Synchrotron X-Ray Diffraction
… titanium in aerospace industry. Understanding deformation mechanisms of HCP metals is crucial for developing predictive models that can be used for performance and failures analysis of engineering components. The two main deformation modes in HCP polycrystals are slip and twinning. While …
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Investigation into the mechanical response and microstructure evolution of high density polyethylene, under conditions applicable to the injection stretch blow moulding process
… processing window, between 126 - 130°C, were the deformation was applied at high rates, between 3 – 16 s-1, under equal-biaxial (EB) and sequential biaxial (SQ) deformation modes. Likewise, the stress-strain response was investigated under displacement control, where a temperature change of 1°C …
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Fe Modeling In Support Of Vibration Based Damage Detection In Bridges
… of frequencies for characteristic deck slab deformation modes for each case of simulated damage. Results for each damage case are compared to a reference one with no bearing pads. The variation of frequency with vertical stiffness at mid span is then developed to quantify the sensitivity of …
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Coiling of elastic rods on rigid substrates
… and relative speeds of deployment. The various modes selected and their characteristic length-scales are found to arise from a complex interplay between gravitational, bending, and twisting energies of the rod, coupled to the geometric nonlinearities intrinsic to their large deformations. We …
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Large-Scale Cyclic Testing and Development of Ring Shaped - Steel Plate Shear Walls for Improved Seismic Performance of Buildings
… on the boundary frame forces, infill panel shear deformation modes, buckling mode shapes, and buckling magnitudes. Multiple computational modeling techniques were employed to reproduce different facets of the system behavior. First, detailed finite element models were constructed to accurately …
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Numerical modelling in large strain plasticity with application to tube collapse analysis
… plastic flow, without unwanted "zero-energy" deformation modes or tangling over of the mesh. Elastic-plastic, rate dependent laws are modelled with a "radial return" algorithm. The transmission of heat generated by plastic work and material dependence on temperature are also included, enabling …
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Theorie und Numerik einer oberflächenorientierten Schalenformulierung
… of degrees of freedom and therewith of possible deformation modes, artificial stiffening effects will appear. A way out is given by a special extention of the assumed natural strain and the assumed strain method for the utilization in the presented surface-related shell formulation. This leads to …
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