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Sunday, November 8, 2020 | History

1 edition of Effects of voids on material deformation found in the catalog.

Effects of voids on material deformation

Effects of voids on material deformation

presented at 1976 Applied Mechanics Division meeting, Salt LakeCity, Utah, June 14, 1976

by

  • 148 Want to read
  • 24 Currently reading

Published by American Society of Mechanical Engineers in New York .
Written in English

    Subjects:
  • Deformations (Mechanics) -- Congresses.,
  • Porosity -- Congresses.

  • Edition Notes

    Includes bibliographical references.

    Statementsponsored by the Applied Mechanics Division, A.S.M.E ; edited and organized by Stephen C. Cowin and Michael M. Carroll.
    SeriesAMD ; v. 16
    ContributionsCowin, Stephen Corteen., Carroll, Michael M., American Society of Mechanical Engineers. Applied Mechanics Division.
    Classifications
    LC ClassificationsTA417.6
    The Physical Object
    Paginationv, 188 p. :
    Number of Pages188
    ID Numbers
    Open LibraryOL20364400M

    Introduction. The cavitation phenomenon was discovered in many semicrystalline polymers. The generation of voids (cavities) is usually observed in two different circumstances: during isothermal crystallization [1–9] and during tensile deformation [10–14].To my knowledge, so far, both cases have been analyzed and described separately. The voids nucleate sites are mainly particles such as inclusions or precipitates, and grain boundries. These voids grow and coalesce according to three modes. The first mode is directly coalescence of voids followed by growth [2]. The second one is the coalescence of voids caused by shear deformation followed by internal necking between voids [3]. This paper investigated the effects of aggregate mesostructures on permanent deformation behavior of an asphalt mixture using the three-dimensional (3D) discrete element method (DEM). A 3D discrete element (DE) model of an asphalt mixture composed of coarse aggregates, asphalt mastic, and air voids was developed. Mesomechanical models representing the interactions among the components of.


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Effects of voids on material deformation Download PDF EPUB FB2

Voids in Materials treats voids of different shapes and forms in various materials, and examines their effects on material properties. The book covers the origins of voids in materials, how they are sometimes introduced in the form of hollow spheres, and the resultant properties of materials containing voids.

To study the effects of voids and HCP-phase inclusion on the deformation process of FCC single-crystal CoCrFeMnNi HEA under tensile loading, the discontinuity of the relationship between stress and strain, as well as the microstructural evolution of this material, was : Yuming Qi, Xiuhua Chen, Miaolin Feng.

ASCE Subject Headings: Voids, Failure analysis, Material failures, Mixtures, Temperature effects, Porous media, Load tests, Deformation (mechanics) Journal of Materials in Civil Engineering Vol. 32, Issue 9 (September )Cited by: 2.

air void within the mixture will lead to the loss in permeability and clogging problem [6]. Least fine materials mixture has caused the mixture to become sensitive towards the changes in voids content as shown by the sudden drop in resilient modulus and large increase in permeability and abrasion loss at high voids content.

However, the material with voids inside often undertakes loading from different direction in different forging stage, which may results in closure-reopen effects of the Effects of voids on material deformation book. Therefore, modeling the 3-d deformation behavior of the voids is of great significance in multi-hit deformation of the : Feng Chao, Cui Zhenshan, Shang Xiaoqing, Li Xinjia.

The combined effects of strain localization and void contribute to the earlier break in V-samples than in H-samples. Diagram of (a) horizontal (H-) and vertical (V-) sample, (b) normal tensile. While the Gurson model (Gurson, ), and modified versions of it (Gao and Kim,Monchiet et al.,Needleman and Tvergaard, ), are the most common approaches for considering the effects of voids on material behavior, they only consider the effects of voids in a homogeneous averaged sense.

Effect of void defect on c-axis deformation of single-crystal Ti under uniaxial stress conditions: Evolution of tension twinning and dislocations - Volume 34 Issue 21. 14 effects of strain state and rate on deformationinduced transformation in stainless steel.

15 multiparameter plots and deformation mechanism maps. the effect of high strain rate on material properties. introduction. Effect of the Degree of Plastic Deformation on the Electrical Resistance and Thermal Conductivity of Al-Mg-Si AlloyJoseph Ajibade OMOTOYINBO, Isiaka Oluwole OLADELE and Wasiu SHOKOYA.

Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Nigeria. E-mails: [email protected]; [email protected]   Deformation behavior of polymethyl methacrylate (PMMA) bone cement is explored using microindentation.

Two types of PMMA bone cement were prepared. Vacuum treated samples were subjected to the degassing of the material under vacuum of mbar for 35 s, followed by the second degassing under vacuum of mbar for 35 s. Size effects related to the mechanical behavior of materials have been widely observed experimentally, e.g., the Hall-Petch effect describing the dependence of the yield stress of a polycrystalline aggregate to the grain size, the Indentation Size effect (ISE) in nanohardness measurements where an inverse relation between hardness and indentor depth is observed, the Bending effect.

The hydrogen effect on void growth and coalescence is investigated by studying the deformation of a unit cell containing a spherical void in the presence of hydrogen. The characteristic plasticity associated with the deformation of helium bubbles and voids in aluminium under shock compression is investigated by molecular dynamics (MD) simulations.

The scenarios indicate that the emission of shear dislocation loops rather than prismatic loops is the mechanism by which helium bubbles and voids collapse. This book is written for both mathematical and materials science researchers interested in advancing research at this interface; for federal and state agency representatives interested in encouraging such collaborations; and for anyone wanting information on how such cross-disciplinary, collaborative efforts can be accomplished successfully.

Principle 4. Effect 5. Factors 6. Method. Introduction to the Compaction of Soils: Soil is used as a construction material for constructing embankments and subgrades.

Embankments are constructed to raise the ground level above the existing level up to the formation level to support buildings, roads, or railways or other structures and also to.

Molecular dynamics simulations are performed to study the effect of preexisting ellipsoidal voids on the tensile deformation behavior in nanocrystalline copper. No crack propagation is observed regardless of the orientation of the voids with respect to the tensile direction.

The effect of different amounts of prior cold-rolling deformation on the anneal-hardening response of CuZn, CuZn, and supersaturated CuZn has been investigated. •It is a time- dependent deformation under a certain applied load. •Generally occurs at high temperature (thermal creep), but can also happen at room temperature in certain materials (e.g.

lead or glass), albeit much slower. •As a result, the material undergoes a time dependent increase in length, which could be dangerous while in service. They concluded that spherical voids have the largest effect on the material's properties. Zheng et al studied the influence of pre-existing ellipsoidal voids on the tensile deformation behavior of nanocrystalline copper with a mean grain size of nm at K.

They found that dislocations emitted from the void tips may facilitate shear plane. Crazing is the phenomenon that produces a network of fine cracks on the surface of a material, for example in a glaze layer.

Crazing frequently precedes fracture in some glassy thermoplastic it only takes place under tensile stress, the plane of the crazing corresponds to the stress direction. Void configuration plays an essential role in the deformation behavior of ductile metals; its effects on intervoid interference has not been investigated systematically until now.

In the present study, molecular dynamics simulation was employed to study the void configuration-induced change in mechanical properties and deformation mechanisms. to inadequate compaction. High air void contents are associated with more rapid aging and increased likelihood of ravelling.

Increased asphalt film thickness can significantly reduce the rate of aging and offset the effects of high air voids.2 Surface softening and aggregate dislodging due to oil spillage are also classified as ravelling.7 A - 6.

Request PDF | Mesoscale Modeling of 3-D Voids Evolution in Large Ingot During Multi-Hit Deformation | Due to non-uniform solidification, internal void defects (like porosity and shrinkage) often.

The plastic deformation of materials is affected by external boundaries and microstructures, both of which can induce a serious phenomenon, viz., “size effects” in the microforming process. A material that obeys Hooke’s Law (Eqn. ) is called Hookean.

Such a material iselastic accordingtothedescription ofelasticity given earlier (immediate response,fullrecovery), andit is also linear in its relation between stress and strain (or equivalently, force and deformation). SAP had a significant effect on maintaining the internal relative humidity of concrete.

The hybrid system of 04% SAP and 6% MEA not only eliminated autogenous shrinkage but also controlled the deformation of expansion to a minimum. The addition of SAP and MEA generally resulted in a reduction in the cube strength of concrete.

In materials science and solid mechanics, Poisson's ratio is a measure of the Poisson effect, the deformation (expansion or contraction) of a material in directions perpendicular to the direction of value of Poisson's ratio is the negative of the ratio of transverse strain to axial small values of these changes, is the amount of transversal elongation divided by the.

•In addition to slip, plastic deformation can occur by twinning. •A shear force can produce atomic displacements so that on one side of the plane (the twin boundary), atoms are located in mirror image positions to atoms on the other side. Deformation by Twinning.

These individual voids grow and link to form cracks several grains long, and finally failure occurs. The ultimate rupture is by a tensile overload when effective wall thickness is too thin to contain the steam pressure.

Since creep deformation occurs by grain-boundary sliding, the more grain boundary area, the easier creep deformation will be. In effect, the displaced water, from which the measured value is derived, accounts for both the resin sample and its contained voids.

The void content, as described later on, although not easy to determine, should be known or accounted for in the following manner: Measured S.G. = Inherent S.G. – (Inherent S.G. × × [% Void Content]). deformation may be achieved (i.e.

damage accumulation leading to failure is delayed). Creep is permanent deformation of a material under constant load (or constant stress) as a function of time. (Usually at ‘high temperatures’ → lead creeps at RT). Creep Normally, increased plastic deformation takes place with increasing load (or stress).

Materials used in nuclear technology suffer from degradation due to radiation. The goal of the research on nuclear materials is to understand the effects of radiation and use the knowledge gained to improve materials resistance for applications in energy production or storage of radioactive materials.

As shown in the image below, the net plastic deformation of both edge and screw dislocations is the same, however. The dislocations move along the densest planes of atoms in a material, because the stress needed to move the dislocation increases with the spacing between the planes.

The performance and durability of Ni-rich cathode materials are controlled in no small part by their mechanical durability, as chemomechanical breakdown at the nano-scale leads to increased internal resistance and decreased storage capacity.

The mechanical degradation is caused by the transient lithium diffu Energy and Environmental Science HOT Articles Recent Open Access Articles. effect of stress concentrationat microscopic flaws. The applied stress is amplified at the tips of micro-cracks, voids, notches, surface scratches, corners, etc.

that are called stress raisers. The magnitude of this amplification In ductile materials, plastic deformation at a crack tip “blunts” the crack. Peat is a kind of special material rich in organic matter. Because of the high content of organic matter, it shows different deformation behaviors from conventional geotechnical materials.

Peat grain has a non-negligible compressibility due to the presence of organic matter. Biogas can generate from peat and can be trapped in form of gas bubbles.

The deformation behavior, however, clearly changed by the presence of voids. The yield stresses and maximum flow stresses of the carbon steel with voids became higher compared with those without voids. Still more, the dispersed fine voids delayed the onset of dynamic recrystallization.

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of persistent mechanical can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material.

Creep is more severe in materials that are subjected to heat for long periods and. The formulation incorporates Gurson’s constitutive model for void growth and plastic deformation.

An algorithm for stable solutions of the nonlinear constitutive equations is also discussed. Hourglass mode control is provided by adding a small fraction of internal force determined through full integration along the in-plane axes and reduced.

For each material the critical shear stress is a constant and depends on the type of bonding force. It is independent of the relative orientation of the applied stress, the slip direction, hut it is affected by temperature, purity, effect of minor deformation, rate of deformation and surface effects.introduced during deformation without reducing the strength of the cold worked material.

Recrystallization - A medium-temperature annealing heat treatment designed to eliminate all of the effects of the strain hardening produced during cold working. Nucleation and growth of a new stress-free microstructure occurs.Porosity or void fraction is a measure of the void (i.e.

"empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and %. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf.

closed-cell foam). There are many ways to test porosity in a.