scholarly journals Model Calculations of Elastic Moduli in Highly Deformed Composites

1989 ◽  
Vol 10 (2) ◽  
pp. 153-164 ◽  
Author(s):  
H. J. Bunge
Keyword(s):  
Plastic Deformation ◽  
Simple Model ◽  
Elastic Moduli ◽  
Opposite Sign ◽  
Internal Stresses ◽  
Minor Importance ◽  
High Increase ◽  
Two Phase ◽  
Linear Elasticity Theory ◽  
Model Calculations

Young's modulus of heavily deformed two-phase composites shows an unusually high increase after plastic deformation. It is assumed that this is due to two reasons, i.e. texture changes and changes of the moduli of the constitutive phases on the basis of non-linear elasticity theory and internal stresses of opposite sign in the phases. Expressions of the two contributions are given on the basis of simple model assumptions. It is estimated that the changes of shape and arrangement of the phases and shape and arrangement of the crystallites in the phases are only of minor importance.

scholarly journals The behaviour of the lattice of polycrystalline iron in tension

1948 ◽  
Vol 192 (1029) ◽  
pp. 218-231 ◽  
Keyword(s):  
Plastic Deformation ◽  
Residual Strain ◽  
Opposite Sign ◽  
Internal Stresses ◽  
Lattice Plane ◽  
Transverse Compression ◽  
Longitudinal Compression ◽  
Polycrystalline Iron ◽  
Different Types ◽  
The Difference

The stress-strain characteristics have been investigated for two distinct types of lattice plane in specimens of Swedish iron in tension. Earlier observations are confirmed that the metallic lattice under stress ceases to conform with Hooke’s law when external plastic deformation occurs, but the deviation differs in the two cases. The elastic range for the (211) spacing appears to be greater than for the (310) spacing. On removal of stress in excess of the ‘lattice yield’, the two types of spacing show a residual strain of opposite sign to the strain under stress, but the magnitude is different. The residual strain is attributed to the onset of internal stresses as a result of plastic flow, and the difference in strain for the different types of plane to a difference in magnitude of the internal stress for grains of different crystallographic orientation. The internal stresses for both types of plane appear to consist of a longitudinal compression and a transverse compression. These components should be balanced by equivalent regions in tension, but none so far have been found. It may be necessary to conclude that such regions are in a state too disordered for coherent reflexion.

scholarly journals Model Calculations of Plastic Deformation of Two-Phase Materials With Fibre Structure

1993 ◽  
Vol 22 (1) ◽  
pp. 29-42 ◽  
Author(s):  
H. J. Bunge ◽  
W. Böcker
Keyword(s):  
Plastic Deformation ◽  
Fibre Structure ◽  
Two Phase ◽  
Model Calculations ◽  
Fibre Composites ◽  
Deformation Work ◽  
Minimum Deformation ◽  
Inhomogeneous Flow ◽  
Deformation Ratio ◽  
Distribution Of Flow

Plastic flow in two-phase fibre composites during axially symetric deformation is modelled assuming homogeneous deformation of the fibres of the harder phase and inhomogeneous flow in the softer matrix. The distribution of flow between fibres and matrix is described by the deformation ratio α which follows from the assumption of minimum deformation work. The main features of the model agree quite well with experimental results obtained in several powder metallurgically prepared two-phase composites.

Hard and Soft: Principles of Polyner-Impregnated Concrete Using Elastomers

2013 ◽  
Vol 687 ◽  
pp. 118-123 ◽  
Author(s):  
Oliver Weichold ◽  
Udo Antons
Keyword(s):  
Plastic Deformation ◽  
Fracture Mechanics ◽  
Brittle Failure ◽  
Elastic Moduli ◽  
Domain Size ◽  
Glassy Polymers ◽  
Crack Deflection ◽  
Micro Cracks ◽  
Concrete Interface ◽  
Crystalline Matrix

The effect of incorporating elastomeric domains in concrete is described from the point of fracture mechanics. Concrete is subject to brittle failure, since cracks propagate at an enormous speed in the crystalline matrix. However, micro cracks are attracted to volume elements with lower elastic moduli such as elastomeric domains. Cracks that encounter the concrete-elastomer interface are stopped since energy is dissipated by plastic deformation of and/or crack deflection by the elastomer. The domain size and the distribution of the elastomer as well as, and properties of the elastomer-concrete interface are crucial parameters. Such a combination differs substantially from previously prepared polymer-impregnated concretes, in which only glassy polymers were used.

The effect of phase transformations in the process of electrom-beam 3D-printing and post-built heat treatment on the peculiarities of plastic deformation and fracture of high nitrogen Cr-Mn steel

2021 ◽  
pp. 10-17
Author(s):  
E.G. Astafurova ◽  
◽  
K.A. Reunova ◽  
S.V. Astafurov ◽  
M.Yu. Panchenko ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Electron Beam ◽  
Phase Composition ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Raw Material ◽  
High Nitrogen ◽  
Two Phase ◽  
Deformation And Fracture

We investigated the phase composition, plastic deformation and fracture micromechanisms of Fe-(25-26)Cr-(5-12)Mn-0.15C-0.55N (wt. %) high-nitrogen chromium-manganese steel. Obtained by the method of electron-beam 3D-printing (additive manufacturing) and subjected to a heat treatment (at a temperature of 1150°C following by quenching). To establish the effect of the electron-beam 3D-printing process on the phase composition, microstructure and mechanical properties of high-nitrogen steel, a comparison was made with the data for Fe-21Cr-22Mn-0.15C-0.53N austenitic steel (wt. %) obtained by traditional methods (casting and heat treatment) and used as a raw material for additive manufacturing. It was experimentally established that in the specimens obtained by additive manufacturing method, depletion of the steel composition by manganese in the electron-beam 3D-printing and post-built heat treatment contributes to the formation of a macroscopically and microscopically inhomogeneous two-phase structure. In the steel specimens, macroscopic regions of irregular shape with large ferrite grains or a two-phase austenite-ferrite structure (microscopic inhomogeneity) were observed. Despite the change in the concentration of the basic elements (chromium and manganese) in additive manufacturing, a high concentration of interstitial atoms (nitrogen and carbon) remains in steel. This contributes to the macroscopically heterogeneous distribution of interstitial atoms in the specimens - the formation of a supersaturated interstitial solid solution in the austenitic regions due to the low solubility of nitrogen and carbon in the ferrite regions. This inhomogeneous heterophase (ferrite-austenite) structure has high strength properties, good ductility and work hardening, which are close to those of the specimens of the initial high-nitrogen austenitic steel used as the raw material for additive manufacturing.

Modeling the anisotropy of hot plastic deformation of two-phase titanium alloys with a colony microstructure

2018 ◽  
Vol 104 ◽  
pp. 173-195 ◽  
Author(s):  
X.G. Fan ◽  
X.Q. Jiang ◽  
X. Zeng ◽  
Y.G. Shi ◽  
P.F. Gao ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloys ◽  
Two Phase ◽  
Hot Plastic Deformation

On the simulation of the flaking paint due to internal stresses: A simple model

2005 ◽  
Vol 25 (6) ◽  
pp. 518-526 ◽  
Author(s):  
Ghislain de Joussineau ◽  
Jean-Pierre Petit ◽  
Michel Barquins
Keyword(s):  
Simple Model ◽  
Internal Stresses

Mechanical Properties of Diverse High-Temperature Compounds–Thermal Variation of Microhardness and Crack Formation

1988 ◽  
Vol 133 ◽  
Author(s):  
Robert L. Fleischer
Keyword(s):  
Elastic Moduli ◽  
Crack Formation ◽  
The Other ◽  
Terminal Phase ◽  
Thermal Variation ◽  
Two Phase ◽  
Thermally Activated ◽  
High Melting Temperature ◽  
Binary Compounds ◽  
Single Crystal Plasticity

ABSTRACTMicrohardness vs temperature and elastic moduli have been measured for a suite of intermetallic compounds that melt above 1400°C. Binary intermetallics were selected to represent a variety of crystal structures and yet have optimal combinations of high melting temperature (Tm) and low specific gravity. Some deliberately two-phase alloys were prepared in which one phase is a terminal-phase metal and the other an intermetallic compound.Binary compounds can be described by two patterns. In those where plasticity is difficult, hardness decreased slowly with temperature up to Tm/2, the decrease being no more than that normally shown by the elastic moduli. In those compounds where single crystal plasticity is known (or at least plausible), microhardness decreases more rapidly than do elastic moduli, presumably due to thermally activated slip.

Characterization of Microstructure and Mechanical Properties of 6060 Aluminum Alloy Processed by ECAP

2018 ◽  
Vol 275 ◽  
pp. 81-88
Author(s):  
Monika Karoń ◽  
Marcin Adamiak
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Internal Stresses ◽  
Refined Grains ◽  
Angular Pressing ◽  
Heat Treated ◽  
Evolution Of Microstructure

The purpose of this paper is to present the microstructure and mechanical behavior of 6060 aluminum alloy after intense plastic deformation. Equal Channel Angular Pressing (ECAP) was used as a method of severe plastic deformation. Before ECAP part of the samples were heat treated to remove internal stresses in the commercially available aluminium alloy. The evolution of microstructure and tensile strength were tested after 1, 3, 6 and 9 ECAP passes in annealed and non annealed states. It was found that intensely plastically deformed refined grains were present in the tested samples and exhibited increased mechanical properties. Differences were noted between samples without and after heat treatment

Sign in / Sign up

Export Citation Format

Share Document