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 44 for “"plastic behavior"”.
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The plastic behavior of predeformed ice crystals
Analysis of previous plastic deformation experiments in ice has been complicated by the fact that the dislocation density changes during the experiment. To overcome this difficulty, measurements were made at stress levels lower than a predeformation value in an attempt to maintain constant …
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Plastic Behavior of Deep Steel Beams Including Shear Effect
Made available in DSpace on 2014-12-05T17:37:09Z (GMT). No. of bitstreams: 1 6003909.pdf: 2547477 bytes, checksum: c74ce4f255cf3b0e69a8b4da245ae4c5 (MD5) Previous issue date: 1960
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Experimental methods to study plastic behavior of polymer glasses at large deformations
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Influence of large deformations and midplane forces on the plastic behavior of impulsively loaded plates
… deals with an analysis of impulsively loaded plastic plates that includes effects of large deformations and midplane forces. Specifically, it deals with a circular plate of uniform thickness simply supported at its edges. The impulsive loading is characterized by an initial velocity …
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Experimental characterization and modeling of the plastic behavior of a thirdgeneration advanced high strength steel sheet
… mechanical tests were performed to analyze the plastic behavior of a coldrolled Gen3 980T steel with a nominal thickness of 1.58 mm. The mechanical properties and the plastic anisotropy Lankford coefficients were obtained from uniaxial tensile tests performed in 7 angular orientations in the …
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Effects of Defects on the Performance of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing
… partially missing layers, and irregular elastic plastic behavior due to toolpath. It is important to understand the effect of defects on the overall performance of the structures to determine if the manufacturing defect(s) are significant enough to abort and restart the manufacturing process or …
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Reduction of computational effort in structural dynamics calculations
… rapid or discontinuous changes because of plastic behavior or unloading. (3) Models may have to include many degrees of freedom. The higher modes that are present may have very short periods, which require very short time intervals for stability and convergence of the calculation and for …
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Domain-Integral Methods for Computation of Fracture-Mechanics Parameters in Three-Dimensional Functionally-Graded Solids
… accommodates both linear-elastic and deformation-plastic behavior in FGMs. Next discussed is the extension of interaction-integral procedures to compute directly mixed-mode stress intensity factors and T-stresses along planar, curved cracks in FGMs under linear-elastic loading. The investigation …
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Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer
… This scheme takes into account the elastic-plastic behavior of both the matrix and the interphase, and it includes the treatment of stress concentration near the discontinuities of the fibers. The radius of the fibers and the mechanical properties of the matrix were varied in order to …
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Micromechanical finite element model for constitutive elastoplastic analysis of unidirectional fiber-reinforced composites
… of fiber-reinforced composites in elastic-plastic response is presented. The model is applicable to a periodic diamond array of elastic circular fibers embedded in an elastoplastic matrix subjected to a plane stress loading. This model enforces symmetry and anti-symmetry conditions …
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On a Proposal for a Continuum With Microstructure
… from dislocation dynamics are deduced. When plastic strain and yield are identified in terms of the parameters characterizing the dislocation states, familiar flow rules and yield surfaces are produced. The capability of the model to predict not only Tresca and Von-Mises plastic behavior but …
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Mechanical behavior of ultrastructural biocomposites
… to numerous biological materials. Conversely, plastic deformation of aragonite is a governing factor in the formation and flow of large scale geological structures. The technique of nanoindentation combined with in-situ tapping mode atomic force microscopy imaging was used to show the …
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Geometric and material nonlinear analysis of laminated composite plates and shells
… and transverse shear stresses. The elasto-plastic material behavior is incorporated using the flow theory of plasticity. In particular, the modified version of Hill's initial yield criterion is used in which anisotropic parameters of plasticity are introduced with isotropic strain …
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On the observations of autowaves and avalanches in an aluminum magnesium alloy
… strain rate were observed in an extended elastoplastic transition during macroscopically uniform deformation before the onset of the Portevin-Le Chatelier effect. The formation of the synchronous oscillations suggests a reduction in dimensionality in the system. These waves eventually transition …
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Modélisation de la transition solide-fluide dans les géomatériaux. Application aux glissements de terrain.
… deals with the understanding the solid behavior of geomaterials. However, solid ground can happen, under specific external conditions, to turn into fluid : as for example during mudflows or debris flows. In such a context, our work concerns, in a general way, solid-fluid transition in …
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A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
Amorphous thermoplastic polymers are important engineering materials; however, their nonlinear, strongly temperature- and rate-dependent elastic-visco-plastic behavior has, until now, not been very well understood. The behavior has previously been modeled with mixed success by existing constitutive …
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Multiscale modeling of rate dependence and size effects on nanocrystalline metallic thin films
… microstructure on the macroscopic elastic and plastic behavior of nanocrystalline thin films. The traditional multiscale method is modified to impose any state of strain or stress on the representative volume element (RVE). This allows us to simulate displacement-controlled tensile tests and …
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Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… simulations will provide insight into the plastic behavior of the layered structure.'
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Mechanics of inelastic deformation and delamination in paperboard
… of constitutive models describing inelastic behavior of paperboard under complex loading, despite the paper industry's great need of analytical tools to aid the design and manufacturing of better paperboard products. In this thesis, two constitutive models are developed to model the highly …
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Correlação entre os ensaios de esclerometria pendular e método charpy para aços SAE 1080
… hinder the use of the Charpy method, such as the plastic behavior of the material, the required standardized thicknesses and the time spent related to the manufacture of samples. Thus, the objective is to seek for a correlation between the two techniques in the characterization of SAE 1080 carbon …
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