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3 edition of Plastic deformation of amorphous and semi-crystalline materials found in the catalog.

Plastic deformation of amorphous and semi-crystalline materials

Centre de physique des Houches. Г‰cole de Printemps internationale

Plastic deformation of amorphous and semi-crystalline materials

lectures

by Centre de physique des Houches. Г‰cole de Printemps internationale

  • 61 Want to read
  • 14 Currently reading

Published by Éditions de Physique in Les Ulis .
Written in English

    Subjects:
  • Deformations (Mechanics),
  • Plasticity,
  • Strains and stresses

  • About the Edition

    Astronomie, physique.

    Edition Notes

    Includes bibliographical references.

    Statementgiven at an International Spring school, Centre de Physique des Houches, Les Houches, 19-29 April 1982 ; edited by Bertrand Escaig and Christian G"Sell.
    ContributionsEscaig, Bertrand, G"Sell, Christian
    Classifications
    LC ClassificationsTA417.6 C4
    The Physical Object
    PaginationXII-405 p. :
    Number of Pages405
    ID Numbers
    Open LibraryOL14088681M
    ISBN 102902731507

    Amorphous high temperature resins have a randomly ordered molecular structure which does not have a sharp melt point; instead amorphous materials soften gradually as the temperature rises. These materials change viscosity when heated, but seldom are as easy flowing as semi-crystalline materials. Plastic materials are generally considered all the polymers based on chains of molecules mainly based on carbonium and hydrogen atoms. There is a very wide variety of plastics, from several points of view: mechanical, thermal, electrical, aesthetical, processing method.


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Plastic deformation of amorphous and semi-crystalline materials by Centre de physique des Houches. Г‰cole de Printemps internationale Download PDF EPUB FB2

The microstructure of many semi-crystalline polymers consists of rather broad, thin composite inclusions of crystalline and amorphous domains. Plastic deformation of amorphous and semi-crystalline materials. [Orsay, France]: Editions de physique, © (OCoLC) Document Type: Book: All Authors Plastic deformation of amorphous and semi-crystalline materials book Contributors: Bertrand Escaig; Christian G'sell; Centre de physique des Houches.

Plastic Deformation of Amorphous and Semi-Crystalline Materials Edited by B. Escaig and C. G'Sell, pp, Les Edition de Physique, Les Ulis Cedex, France, Authors: Pyrros, Nikos P. WorldCat is the world's largest library catalog, helping you find library materials online.

Learn more ››. We use large-scale molecular dynamics simulations to investigate plastic deformation of semicrystalline polymers with randomly nucleated crystallites.

The strain-softening regime is dominated by deformation of crystallites via reorientation of chain-folded lamellae toward the tensile axis, fragmentation of largest crystalline domains, and a partial loss of by:   Thermal annealing of the deformed films revealed a recoverable “delayed elastic” component and an irreversible “plastic” component.

A three‐stage electrically induced mechanical deformation mechanism was proposed for amorphous materials, while a two‐stage mechanism was proposed for the semi‐crystalline : Ci Zhang, Zhenpeng Li, Haofei Nian, Lei Zhu, Andrew Olah, Eric Baer. The phenomenon of cavitation is observed in many semi-crystalline polymers during uniaxial stretching.

The nano and micro size voids are formed inside the amorphous phase of polymer, usually beginning at yield. Cavitation happens when the strength of amorphous phase is lower than the strength of crystals.

The process of plastic deformation and conditions at which polymers cavitate are Author: Andrzej Pawlak. deformation of semi-crystalline polymers. A schematic representation of the amorphous and semi-crystalline structure is depicted in figure Since semi-crystalline polymers also pos-sess an amorphous phase, for which deformation mechanisms are well-characterised, firstly.

Cavitation occurs in polymers with crystals of higher plastic resistance, while plastic deformation of crystals in polymers with crystals of lower plastic resistance. The necessary conditions for cavitation and for plastic deformation of crystal are defined. They explain why the cavitation is observed in POM, PP, and HDPE but not in by: Drawbacks include amorphous plastics having poor fatigue resistance and are prone to stress cracking.

Semi-Crystalline Thermoplastics: These are Plastic deformation of amorphous and semi-crystalline materials book of your traditional plastics when you think of plastic “parts”. They Plastic deformation of amorphous and semi-crystalline materials book the polyethylene family (LDPE, Plastic deformation of amorphous and semi-crystalline materials book, UHMW-PE), Polypropylene, nylon, acetal and fluoropolymers.

Advantages of these plastics are that they are excellent for bearing, wear. Amorphous materials are more sensitive to stress failure due to the presence of hydrocarbons.

ABS and PVC are common amorphous thermoplastics. Semi-crystalline polymers have a highly ordered molecular structure. These do not soften as the temperature rises, but rather have a defined and narrow melting point. This melting point is generally. Deformation and failure of semi-crystalline Plastic deformation of amorphous and semi-crystalline materials book systems: • You may not further distribute the material or use it for any profit-making activity or commercial gain softening is found to be a property of the amorphous phase.

Although a direct mea-Cited by: 6. Haudin, J. M., Plastic Deformation of Amorphous and Semi-Crystalline Materials, p. Eds. ESCAIG and C. G’SELL Les Editions de Physique, Les Ulis, ( Author: David M.

Parks, Said Ahzi. It is thought that from the early stages the plastic deformation of the amorphous component (at least in HDPE) proceeds primarily by shear (interlamellar sliding)--the preferred process-- before any crystallographic slip in the crystalline component can by: Therefore, the plastic deformation of the crystalline phase must satisfy additional kinematic constraints beyond incompressibility.

The amorphous phase of semi-crystalline polymeric material consists of an assembly of disordered macromolecules, which are morphologically constrained by the neighboring crystalline by: Documents Similar To Amorphous and Semi-Crystalline Carousel Previous Carousel Next Journal of Applhied Polymer Scinence Volume Issue 1 [Doi _app] T.

Law; Z. Mohd Ishak -- Water Absorption and Dimensional Stability of Short Kenaf Fiber-filled Polypropylene. Haudin, J.M. () Plastic deformation of semi-crystalline polymers, in Plastic deformation of amorphous and semi-crystalline materials, eds.

Escaig, B. and G’Sell, C., Les Editions de Physique, les Ulys Google ScholarCited by: 3. Plastic deformation in a crystalline solid occurs by means of the various processes described below, among which slip is the most important mechanism.

Plastic deformation of crystalline materials takes place by mechanisms (figure ) which are very different from those for amorphous materials (such as glasses). Plastic deformation in amorphous. Deformation of semicrystalline (SC) polymers (PE, PP, polyamides, etc.) with their complex structural organization composed of two different (crystalline and amorphous) phases in the presence of Author: Widad Hamdi.

A self-consistent model for semi-crystalline polymers is proposed to study their constitutive behavior, texture and morphology evolution during large plastic deformation. The material is considered as an aggregate of composite inclusions, each representing a stack of crystalline lamellae with their adjacent amorphous layers.

The book considers the internal stress fields that occur during the dislocation of behavior of these materials are described numerically via experimentally measured structural parameters. This book is focused on the mechanical behavior of polycrystalline materials.

Purchase Plastic Deformation of Materials - 1st Edition. Print Book & E-Book. ISBNBook Edition: 1. In plastic: Physical states and molecular morphologies thermoplastics may be amorphous or semicrystalline. Semicrystalline materials display crystalline regions, called crystallites, within an amorphous matrix.

In addition, the relative crystallinities of the major plastics are indicated in the table of properties and applications. Read More. In recent years, the methods of severe plastic deformation and rapid melt quenching have proven to be an effective tool for the formation of the unique properties of materials.

The effect of high-pressure torsion (HPT) on the structure of the amorphous alloys of the quasi-binary TiNi–TiCu system with a copper content of more than 30 at.% produced by melt spinning technique has been analyzed Author: Alexander Glezer, Nikolay Sitnikov, Roman Sundeev, Alexander Shelyakov, Irina Khabibullina.

This lesson covers deformation behavior of amorphous materials and semi-crystalline materials, how to reverse PVT curves to evaluate what happens to polymer materials. Start studying Overview of plastic materials Learn vocabulary, terms, and more with flashcards, games, and other study tools.

A formation of a thermoplastic or Thermoset that can stretch and then return to it's original shape without permanent deformation. Elastomers are only slightly cross-liked.

amorphous or semi-crystalline. We examine the capability of a recently proposed constitutive model of plastic deformation in semi-crystalline polymers to predict this behavior. We neglect the contribution of the amorphous phase to the plastic deformation response and include the effects of adiabatic heating at high strain by: • Glass transition temperature is an important factor to the deformation in non- crystalline material.

• Stress, temperature and free volume are key factors to a deformation mechanism. • Shear band is another deformation mechanism in non-crystalline material – Size: 2MB.

In physics and materials science, plasticity, also known as plastic deformation, is the ability of a solid material to undergo permanent deformation, a non-reversible change of shape in response to applied forces. For example, a solid piece of metal being bent or pounded into a new shape displays plasticity as permanent changes occur within the material itself.

In engineering, the transition from elastic behavior. 1 Material Properties of Plastics Formation and Structure The basic structure of plastics (or polymers) is given by macromolecule chains, formulated from monomer units by chemical reactions.

Typical reactions for chain assembling are polyaddition (continuous or step wise) and condensation polymer-ization (polycondensation) [1] (Figure ). Stress-Strain Behavior of Polymers A ductile material shows a characteristic yield point followed by a drop in strength and break at lower stress but much higher strain.

At this point, the material starts to undergo plastic deformation. material deformation as a function of time at a constant force • Example: Glacial movement, Silly-Puddy • Static macroscale deformation causes polymer chains to uncoil over time • Disentanglement decreases elastic response, increases viscous response • Crosslinking and crystallinity retard creep by decreasing molecular mobility.

Plastic is material consisting of any of a wide range of synthetic or semi-synthetic organic compounds that are malleable and so can be molded into solid objects. Plasticity is the general property of all materials which can deform irreversibly without breaking but, in the class of moldable polymers.

Semi-crystalline polymers with strong crystalline regions resist deformation and cavitation, the formation of voids in the amorphous phase, drives yielding. [19] As done in crystalline materials, particles can be added to semi-crystalline polymers to change the mechanical properties.

UNDERSTANDING MATERIALS. The material that is used for injection molding (at least in the context of our discussion) is called thermoplastic. There is another type called thermoset, but that is another type entirely.

Over 85% of all injected products are thermoplastic, so we are studying that type material. Amorphous Vs. Crystalline. Unlike thermosets, most plastics companies prefer thermoplastc materials because they can be reprocessed and recycled.

Amorphous vs. Semi-Crystalline. Thermoplastic polymers can be categorized into two types; amor-phous and semi-crystalline. Amorphous polymers melt.

stresses. In a very rough sense, the flow defects in amorphous materials play the role of dislocations in crystals by being the agents of plastic deformation. All of these theories, including STZ, start by assuming that the material of interest is solidlike—that it has a.

Engineering plastics are a group of plastic materials that have better mechanical and/or thermal properties than the more widely used commodity plastics (such as polystyrene, PVC, polypropylene and polyethylene).

Being more expensive, engineering plastics are produced in lower quantities and tend to be used for smaller objects or low-volume applications (such as mechanical parts), rather than. INTRODUCTION. Fundamental differences in atomic bonding suggest that plastic deformation of amorphous covalent network materials should be treated separately from other groups of amorphous materials, such as metallic glasses and glassy polymers.

1 These latter materials have been the main focus of research on plastic deformation of amorphous materials in the last few by: 6. In this chapter, evolution of structure and properties of amorphous alloys is discussed.

Amorphous structure change before crystallization is analyzed for a lot of systems. Structure and property changes are discussed for both amorphous and amorphous‐nanocrystalline materials.

Nanocrystal formation in metallic glasses is considered at heating and by: 5. Pdf materials are ubiquitous in natural and engineered systems. Granular.

fault gouge in earthquakes faults, thin film lubricants, and bulk metallic glasses are seemingly disparate systems which are similar in that they possess an amorphous structure. Colloids, emulsions, window glass, dense polymers, and even biological tissues are other examples.Strain Hardening of Amorphous and Semi-crystalline Polymers.

Strain hardening is observed as a strengthening of a material during large strain deformation. It is caused by large scale orientation of chain molecules and lamellar crystals.

This phenomenon is quite often observed when plastic materials are stretched beyond their yield point.The generation of heat ebook the necking ebook semi-crystalline polymers was noted at least as far back aswhile Haward et al. [29–31] and Roseen first applied infrared thermography to the deformation of semi-crystalline polymers in the mid s.

With that said, the use of this technique to study the plastic deformation of amorphous Cited by: 5.