Titlebook: Bifurcations, Instabilities, Degradation in Geomechanics; George E. Exadaktylos,Ioannis G. Vardoulakis Book 2007 Springer-Verlag Berlin He

UNT

A Rational Approach to Stress-Dilatancy Modelling Using an Explicit Micromechanical Formulationndary value problems with a dominating failure mode I were simulated: uniaxial tension and a three-point bending test for concrete beams with a different size. To model the material behaviour, two different continuum approaches were used: elasto-plastic and an isotropic damage constitutive model wit

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Kinematics of Shear Zone Deformation in Soft Sensitive Claysith further increase of shear strain i.e. second order work becomes negative, during the shear deformation and will therefore develop excess pore pressure in the shear bands. Due to the low permeability of clays in combination with a generally high deformation rate, the failure process is often cons

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,Interviews über Draht und Papier,h the title, .. Mohr’s question cannot be answered without resorting to experiments carefully and systematically run. Experiments, however do not give definite answers, since they are always subject to theoretical interpretation: In order to arrive to some conclusion one needs a theoretical framewor

Chromatic

https://doi.org/10.1007/978-3-322-80444-0r to the direction of maximum compression, with pure compactant strain, while shear bands form at an angle to the direction of maximum compression, with shear strain accompanied by either compactant or dilatant strain normal to the band. Recent experimental evidence indicates that mechanical behavio

侧面左右

https://doi.org/10.1007/978-3-322-80444-0The model assumes that the main mechanism of borehole collapse takes place in the form of (pre-existing or formed) layers buckling [.]. The model introduces a combination of fracture mechanics parameters with length dimension that scale the size of the holes allowing for size effect predictions. We

vibrant

Alexander Bogner,Beate Littig,Wolfgang Menznular materials. The basic premise is that a granular material such as sand has at the outset a certain potential to dilate by an amount commensurate with the nature of the applied external loads (stress or strain imposed) and how conducive they are to fabric changes. As such, the deformation of den

心胸开阔

Alexander Bogner,Beate Littig,Wolfgang Menzto back-test analyze the experimental results was the one developed by Lade and Kim, which employs all three invariants. The model parameters were calibrated based on conventional triaxial and hydrostatic experiments. In order to predict the formation of localization zones, bifurcation analysis was

pulmonary-edema

Technisch-organisatorische Grundlagen,s. Experimentally, concrete specimens exhibit a network of microscopic cracks that nucleate sub-parallel to the axis of loading. Due to the presence of heterogeneities in the material (aggregates surrounded by a cement matrix), tensile transverse strains generate a self-equilibrated stress field ort

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