Effect of Specimen Preparation Method on the Stress-Strain Behavior of Sand in Plane-Strain Compression Tests

The development of physically-based models of microstructural evolution during hot deformation of metallic materials requires knowledge of the grain/subgrain structure and crystallographic texture characteristics over a range of processing conditions. A Fe-30wt%Ni based alloy, retaining a stable austenitic structure at room temperature, was used for modelling the development of austenite microstructure during hot deformation of conventional carbon-manganese steels. A series of plane strain compression tests was carried out at a temperature of 950 °C and strain rates of 10 s-1 and 0.1 s-1 to several strain levels. Evolution of the grain/subgrain structure and crystallographic texture was characterised in detail using quantitative light microscopy and highresolution electron backscatter diffraction. Crystallographic texture characteristics were determined separately for the observed deformed and recrystallised grains. The subgrain geometry and dimensions together with the misorientation vectors across sub-boundaries were quantified in detail across large sample areas and the orientation dependence of these characteristics was determined. Formation mechanisms of the recrystallised grains were established in relation to the deformation microstructure.

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A COMPARISON OF STRESS-STRAIN BEHAVIOR IN CUTTING AND HIGH STRAIN-RATE COMPRESSION TESTS

Advances in Machine Tool Design and Research 1967 ◽

10.1016/b978-0-08-003491-1.50016-2 ◽

1968 ◽

pp. 233-246 ◽

Cited By ~ 2

Author(s):

J. WOLAK ◽

I. FINNIE

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Compression Tests ◽

Stress Strain ◽

Strain Behavior ◽

Strain Rate Compression

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Texture Formation Behaviour during High-Temperature Plane Strain Compression Deformation in AZ91 Magnesium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.941.1198 ◽

2018 ◽

Vol 941 ◽

pp. 1198-1202

Author(s):

Dong Keun Han ◽

Min Soo Park ◽

Han Sang Kwon ◽

Kwon Hoo Kim

Keyword(s):

High Temperature ◽

Strain Rate ◽

Plane Strain ◽

Texture Evolution ◽

Plane Strain Compression ◽

Deformation Condition ◽

Rolled Plate ◽

Pole Density ◽

Texture Formation ◽

Compression Tests

In previous study, it was investigated texture formation behaviour of high-temperature plane strain compression test at 723K, under a strain rate of 5.0. It was found that the main texture component and it was sharpness vary depending on deformation conditions. To clarify the characteristic of texture formation behaviour, it is necessary to investigate at various deformation condition. Therefore, in this study, is investigating the influence or texture formation behaviour and strain, strain rate at 673K. Three kinds of specimens with different initial textures were machined out from a rolled plate having a <0001> texture. The plane strain compression tests were conducted at a temperature 673K, and a strain rate of 5.0, with strain between-0.4 to-1.0. After compression tests, the specimens were immediately quenched in oil. The texture evolution was conducted by the Schulz reflection method using Cu Kα radiation and EBSD. Before the deformation, {0001} of specimen A was accumulated in the center of pole figure. The {0001} of specimen B was accumulated at the RD direction. The {0001} of specimen C was accumulated TD direction. As a result, work softening is observed in all the cases at the true stress – true strain curve for three types of specimens. After deformation, the maximum pole density of increases with increasing strain. In this study, it was found that the stable orientation was (0001)<100> and (0001)<110> during deformation.

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Uniform Nonlinear Constitutive Model and Parameters for Clay in Different Consolidation Conditions Based on Regression Method

Mathematical Problems in Engineering ◽

10.1155/2014/804586 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Tao Cheng ◽

Keqin Yan ◽

Huazhi Zhang ◽

Xianfeng Luo ◽

Shengfang Li

Keyword(s):

Constitutive Model ◽

Initial Conditions ◽

Constitutive Relations ◽

Test Sample ◽

Maximum Relative Error ◽

Compression Tests ◽

Stress Strain ◽

Strain Behavior ◽

Nonlinear Constitutive Model ◽

Isotropic Consolidation

The nonlinear constitutive relations of clay are investigated considering different initial conditions. Highly compressible clay is selected as the test sample. Two groups of tri-axial compression tests are performed, respectively, afterK0consolidation and isotropic consolidation. On the basis of the framework ofE~vmodel, a uniform nonlinear constitutive model is proposed by fitting the test data. With the average slope of the unloading-reloading curve selected as the unloading modulus, the unloading function is constructed as the loading-unloading criterion. Moreover, a comparison between the experimental stress-strain curves and the results predicted by the constitutive model is made. It is shown that the prediction is reasonable, which can reflect the stress-strain behavior of the soil under theK0consolidation and isotropic consolidation conditions. The maximum relative error of the two series of curves is not remarkable, less than 6%.

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