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Thursday, July 23, 2020 | History

2 edition of Deformation processes in polycrystalline aggregates of gypsum found in the catalog.

Deformation processes in polycrystalline aggregates of gypsum

Siese de Meer

Deformation processes in polycrystalline aggregates of gypsum

by Siese de Meer

  • 377 Want to read
  • 19 Currently reading

Published by Faculteit Aardwetenschappen, Universiteit Utrecht] in [Utrecht .
Written in English

    Subjects:
  • Gypsum.,
  • Rock deformation.,
  • Rocks -- Creep.

  • Edition Notes

    Other titlesVervormingsprocessen in polykristallijne aggregaten van gips
    StatementSiese de Meer.
    SeriesGeologica Ultraiectina,, no. 132
    Classifications
    LC ClassificationsQE1 .G1342 no. 132
    The Physical Object
    Paginationiv, 211 p. :
    Number of Pages211
    ID Numbers
    Open LibraryOL741157M
    ISBN 109071577864
    LC Control Number97133013
    OCLC/WorldCa34491321

    Materials, an international, peer-reviewed Open Access journal. Laboratory of SHS Melts and Cast Materials, Merzhanov Institute of Structural Macrokinetics . Polycrystalline aggregates which contain some liquid in grain interfaces can deform by matter transport, through the liquid phase. If the applied stress is multiaxial, then the deviatoric component Cited by:

    we quantify the changes that the pores and aggregates between to g cm 3. Samples were saturated by first undergo when a reclamation process with gypsum takes wetting by capillarity rise from below, then gradually raising place in a sodic soil. We also relate the changes in size the water level until water ponded on the surface. A constantCited by: Overview of the tectonic framework and the Comeglians-Paularo shear zone. The study area is located in the (Eastern) Southern Alps, which are bordered in the north by the Periadriatic Fault, the major strike-slip fault of the Alpine orogen (Handy et al., ).The N-ward moving Adriatic microplate and the Southern Alps at its front act as a rigid by: 8.

    Cambridge Core - Solid Earth Geophysics - Salt Tectonics - by Martin P. A. JacksonCited by:   ICE manual of Construction Materials. Chapter 1: Fundamentals of materials While new high value-added materials produced in small volumes using advanced manufacturing processes may offer unique benefits, we are unlikely to see radical displacement of the main materials: concrete, steel, brick, stone, glass and polymers. The distinctive.


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Deformation processes in polycrystalline aggregates of gypsum by Siese de Meer Download PDF EPUB FB2

This reason, the deformation behaviour of polycrystalline gypsum, and the underlying microphysical processes, form a subject of considerable interest in structural geology, tectonophysics and geomechanics.

In addition, the deformation and densification behaviour of polycrystalline gypsum is of fundamental interest for. The novel deformation process proposed by the present authors for the large-scale deformation associated with cooperative grain-boundary sliding can be easily examined in a compressive test using a model aggregate comprising circular or hexagonal bars (pencils in the present study) as shown in Fig.

1.A model aggregate which has five horizontal layers, each of which has 13 or 14 pencils, was Cited by: Microscopic evidence is given that during plastic deformation of a polycrystalline aggregate the crystals both at the surface and in the interior are deformed inhomogeneously.

In addition, it is found that slip is not always confined to {} planes but may also occur on {} or {} by: This contribution presents a quantitative microstructural analysis of a polycrystalline aggregate of gypsum, deformed in torsion (T = °C) at γ (shear strain) ranging from 0 to   A full geometric analysis of the tensile deformation of cube-texture copper has been carried out by which it has been possible to predict the limit of uniform elongation and associated lattice rotation as well as to account for the plastic anisotropy of cube-texture material.

The yield criterion of the oriented material over the whole plastic range is shown to be one of limiting shear energy Cited by: The studied gypsum samples are cores about 9 mm thick and mm long obtained from natural gypsum (gypsum%).

The specimens (Table 1 and Fig. 1a) were deformed in torsion experiments. A micromechanical model has been developed to describe deformation-induced surface roughening in polycrystalline materials. The three-dimensional polycrystalline structure is taken into account in an explicit form with regard to the crystallographic orientation of grains to simulate the micro- and mesoscale deformation processes.

Constitutive relations for describing the grain response are Cited by: 2. Synthetic quartz aggregates of low porosity have been fabricated from natural quartz powder, impure silica gel, and high‐purity silicic acid by hydrothermal isostatic pressing at MPa.

The resulting specimens have water contents comparable to those of natural quartzites and have been used for deformation tests.

Geological Society, London, Special Publications ; v. ; p. € M. Zucali, V. Barberini, D. Chateigner, B. Ouladdiaf and L. Lutterotti € data microstructural and texture analysis from optical and diffraction experimentally deformed in torsion to high strains: quantitative Brittle plus plastic deformation of gypsum aggregates €Cited by: 6.

In the case of bastites, which are polycrystalline lamellar aggregates (up to cm in size) formed by different serpentines in random and ultrafine associations (Figure 1b), brittle deformation does not result in grain/crystal size reduction but in the formation of polycrystalline clasts tens to hundreds μm in size.

Preferential cataclastic flow Cited by: 7. Dislocations and Plastic Deformation 9Motion of dislocations in response to stress 9Slip Systems 9Plastic deformation in single crystals polycrystalline materials Strengthening mechanisms 9Grain Size Reduction 9Solid Solution Strengthening 9Strain Hardening Recovery, Recrystallization, and Grain Growth Not tested: Deformation by twinning,File Size: KB.

both diffusion processes and dislocation slip in a polycrystal subject to constant applied stress. In the present paper, the set of processes and associated equations necessary for a field theory of diffusional creep, where the diffusion creep viscoplastic deformation rate is related to the gradient of the vacancy flux, will be presented.

The objective of this dissertation is to explore plastic deformation of bridgmanite and periclase polycrystalline aggregates from both modeling and experimental approaches.

In particular to understand the influence of microstructure in texture development and the role of deformation heterogeneities at the local grain : Eloisa Zepeda-Alarcon. Title: Aggregates and the Deformation Properties of Concrete Author(s): Mark G.

Alexander Publication: Materials Journal Volume: 93 Issue: 6 Appears on pages(s): Keywords: aggregates; creep tests; deformation; modulus of elastic-ity; shrinkage. Date: 11/1/ Abstract: This paper presents results from two comprehensive series of tests spanning a 5-year period that investigated the Cited by: polycrystalline aggregates has always been the interest of many investigators.

Most of time numerical simulations for polycrystalline materials were performed via finite element models in which the morphological and crystallographic characteristics of microstructure was emphasized []. Kumar [32] adopted Voronoi tessellation inFile Size: 1MB.

Define polycrystalline. polycrystalline synonyms, polycrystalline pronunciation, polycrystalline translation, English dictionary definition of polycrystalline. adj having many crystals Adj. polycrystalline - composed of aggregates of crystals; "polycrystalline metals" crystalline - consisting of or containing or.

Multiscale Characterization of a Polycrystalline Aggregate Subjected to Severe Plastic Deformation with the Finite Element Method Finite element analyses of a periodic polycrystalline aggregate were carried out to simulate the deformation process corresponding to the multi-pass equal-channel angular extrusion process, which reached over Cited by: 1.

Final properties of formed steel or another alloy pieces are affected even by plastic deformation of material. Therefore it is needful to know detail structure changes of material under conditions of plastic deformation caused by forming, grinding, drilling etc.

Estimation of the deformation based on its observable macroscopic effects doesn’t correspond fully with microscopic structural Cited by: 2. Polycrystalline aggregates which contain some liquid in grain interfaces can deform by matter transport, through the liquid phase.

If the applied stress is multiaxial, then the deviatoric component of the stress will produce creep, that is, a change in shape of the aggregate without any change in volume, while the mean stress will cause the aggregate to by: Polycrystalline aggregates composed of materials that the kidneys normally excrete in the urine Factors affecting the severity of obstructive uropathy location, completeness, involvement of one or both upper urinary tracts, duration, and cause; stones greater than 5mm are more likely to obstruct.

Deformation mechanisms is commonly characterized as brittle, ductile and brittle-ductile. The driving mechanism responsible is a subject of interplay between internal (e.g composition, grain size and lattice-preferred orientation) and external (e.g temperature and fluid pressure) factors.

These mechanisms produce a range of micro-structures studied in rocks to constrain the conditions.multi-phase polycrystalline materials Simon Gill 1. Introduction to model 2. Diffusive crack growth in an elastic bi- problems allows a range of dissipative processes and thermodynamics driving forces to be incorporated Diffusional deformation of polycrystalline materials.Hardness: Measure of a material's resistance to deformation by surface indentation or by abrasion k.

Safety Factors: design approaches employed to protect against unanticipated failure (virtually all engineering materials exhibit a variability in their measured mechanical properties, imperfections resulting from manufacturing and sometimes may.