Svantje

Svantje

Numerical simulations have been conducted to understand the complex interplay between hardening characteristics of the materials under investigation, profile cross-section variation and energy absorption. The model's three-dimensional tensorial as well as reduced plane-stress vector formulations are given. The two approaches use different reference frames, and we emphasize the need for consistent stress definitions and for conversion between the separate stress measures when transferring results between the approaches. We propose scaling relations that achieve naturally a perfect agreement with the numerical and experimental data. The proposed constitutive model incorporating anisotropic damage is applied to the first hierarchical level of dental enamel and validated by experimental results.

What Does The Name Swantje Mean?

To achieve this, the orientation mass density is introduced as a mesoscopic field, i. The focus of this work is on thermodynamically consistent modeling of grain size dependent hardening effects. Moreover, in order to gain further insight in the damage-tolerance behavior of enamel, the size of crystallites below which the structure becomes insensitive to flaws is studied by a microstructural finite element model. The effect of the fiber orientation on the damage behavior and compressive strength is studied by comparing micro-pillar experiments of dental enamel at the first hierarchical level in multiple directions of fiber orientation. In this regard, the influence of the material length scale is investigated. The simulation results are compared to experimental data from microcantilever beams for different process temperatures.

What Does The Name Svantje Mean?

In addition to its direct effect on material's strength and stiffness, it causes deterioration of the heat conduction. Splitting and distribution process of partitioned master inclusion surface mesh: a split surface mesh, b partitioned master face mesh and c interior surface mesh. Thus, isolating the colony boundary strengthening Hall-Petch coefficient K C experimentally requires a sufficient number of specimens with different colony sizes λ C but constant lamella thickness λ L and domain size λ D , difficult to produce even with sophisticated alloying techniques. Such models are of major importance in the field of computational micromechanics for homogenization purposes utilizing unit cell models. Key features of the theory are elucidated using a series of three-dimensional numerical examples. Gradient enhanced theories of crystal plasticity enjoy great research interest. This is achieved using the continuum interface theory of Gurtin and Murdoch 1975 which endows the interface with its own energetic structure.

Swantje Meaning, Swantje name meaning

With the equivalent inhomogeneity specified as proposed here, the effective properties of the material with interphases can be found using any method applicable to analysis of the materials with perfect interfaces i. The finite deformation model is able to predict the failure process in submicron-sized metallic glasses as well as the delay of it with decreasing sample size. The change in the fracture mechanism from a shear band slip to necking-like homogeneous flow is quantitative interpreted by calculating the critical shear band length. Different collision scenarios such as impact locations, angles of attack and speeds are examined. On the basis of the numerical solution, the dependences of homogenized Poisson's coefficients on macro-strains and the non-linear stress-strain diagrams for a material with randomly distributed unidirectional ellipsoidal pores are predicted and discussed for different volume fractions of pores.

What Does The Name Swantje Mean?

The circles represent experimentally recorded points prior to necking and the solid line is a plot of Eq. Our observations shed light on the active mechanisms at the micro scale governing the macroscopic response. It is demonstrated that for plane strain loading path there occurs no difference in localization predictions of the models with and without cross hardening whereas for biaxial strain paths a delayed localization is observed in the cross hardening model as compared to the one without cross hardening effects. Its conjugate variable, the elastic energy release rate, and evolution law follow the formal steps of thermodynamics of internal variables requiring postulation of an appropriate damage dissipation potential. In addition to its direct effect on material's strength and stiffness, it causes deterioration of the heat conduction. The results are compared to an analytical solution based on simplifying assumptions. The dependence of the normalized bulk moduli of nano-porous aluminum on the pore volume fraction for certain radii of nano-pores are compared to and discussed in the context of other theoretical predictions.

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Your profession was leader, major, and captain. It is shown that the pore design as well as the volume fraction has a strong effect on the mechanical response of the porous metallic glass structures. The behavior of a model of single-crystal strain-gradient viscoplasticity is investigated. The dependence of the normalized bulk and shear moduli of nanoporous aluminum for two sets of surface properties on the pore volume fraction for different radii of nanopores and on the radius of nanopores for fixed volume fraction of nanopores are compared to and discussed in the context of other theoretical predictions. A single-crystal model accounting for the effects of a change in loading path on the critical shear stress for glide at the glide-system level is developed.

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To this end, a non-local thermodynamically consistent, continuum mechanical, constitutive model is developed. It is demonstrated that for plane strain loading path there occurs no difference in localization predictions of the models with and without cross hardening whereas for biaxial strain paths a delayed localization is observed in the cross hardening model as compared to the one without cross hardening effects. The gradients are computed explicitly using the converged plastic strain field and the coupling is achieved using a staggered weak approach. Gradient computation is carried out using an effcient algorithm that makes use of plastic strain increments at integration points whose arrangement is not necessarily regular. The constitutive description is based on the model of a polysynthetically twinned crystal which is adopted to a representative volume element of a fully lamellar microstructure. We study multiscale inelastic materials whose behavior is influenced by the evolution of inelastic microstructure and the corresponding material or internal lengthscales.

What Does The Name Swantje Mean?

The former accounts for cleavage-type of damage without any volume change whereas the latter is a consequence of plastic void growth. Image courtesy of Nadiia Mameka at Helmholtz-Zentrum Geesthacht. The underlying equations for the thermomechanical coupling are derived for a crystal plasticity model with gradient hardening. The relative activity of deformation systems during work hardening and thermal recovery has been investigated in fully lamellar TiAl. Using Green's function this system is transformed to a system of statistically non-linear integral equations. Zusätzlich teilt eine scharfe Front das Polymer in zwei Regionen. A perfectly plastic stress-strain response is obtained, i.

Swantje

Solids, 56 2008 640—662 , and is guided by the viscoplastic model and algorithm of Ekh et al. The relation of the macroscopic kinematic descriptors of the interface deformation to the averaged underlying microscopic quantities is consistently derived using the Hill-type averaging theorem. The algorithm is applied on a void growth problem in which high strain gradients occur around the void due to stress concentrations. The current research aims at investigating this gap using a lower-order gradient enhanced approach both using phenomenological continuum level as well as crystal plasticity models. The paper aims at clarification of the role of reduction in yield locus curvature on forming limit diagrams. Einige dieser Fälle werden in Kapitel 9 genauer betrachtet. The objective here is to apply this framework to macroscopic material layers capable of undergoing an in-plane stretch in addition to the normal opening mode.

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