A mechanical analysis of the plane strain channel-die compression test: friction effects in hot metal testing

Chovet, Corinne; Desrayaud, C.; Montheillet, F.

doi:10.1016/s0020-7403(01)00092-3

Cited by 22 publications

(8 citation statements)

References 11 publications

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“…Þ at the compressed surface, σ a is the apparent flow stress and λ 0 = H 0 /D 0 is the initial aspect ratio of the specimen [23,30]. In the current study, σ a is 2 GPa, λ 0 is 2, e is 0.02 for the Ni-BMG and μ for the used boron nitride (BN) lubricant is 0.3 at room temperature.…”

Section: Philosophical Magazine Letters 357mentioning

confidence: 81%

Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

Lee

Kim

et al. 2014

Philosophical Magazine Letters

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We investigated the effect of geometrically constrained stress-strain conditions on the formation of nanotwins in α-brass phase reinforced Ni 59 Zr 20 Ti 16 Si 2 Sn 3 metallic glass (MG) matrix deformed under macroscopic uniaxial compression. The specific geometrically constrained conditions in the samples lead to a deviation from a simple uniaxial state to a multi-axial stress state, for which nanocrystallization in the MG matrix together with nanoscale twinning of the brass reinforcement is observed in localized regions during plastic flow. The nanocrystals in the MG matrix and the appearance of the twinned structure in the reinforcements indicate that the strain energy is highly confined and the local stress reaches a very high level upon yielding. Both the effective distribution of reinforcements on the strain enhancement of composite and the effects of the complicated stress states on the development of nanotwins in the second-phase brass particles are discussed.

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Section: Philosophical Magazine Letters 357mentioning

confidence: 81%

Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

Lee

Kim

et al. 2014

Philosophical Magazine Letters

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“…For this situation, methods have been devised to correct the flow stress curves for high friction coefficients in CDC. [19] The real problem would then be the inhomogeneous sample deformation that results from at high strains. Consequently, the deformation is homogeneous plane strain compression over most of the sample length.…”

Section: Discussionmentioning

confidence: 99%

Hot plane strain compression testing of aluminum alloys by channel-die compression

Maurice

Piot

Klöcker

et al. 2005

Metall Mater Trans A

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International audienceA thoroughly tested, high-temperature channel-die compression (CDC) rig is described for simulating hot plane strain compression of metallic alloys up to 500 °C. The equipment is currently used to characterize the flow stress and microstructure evolution in hot-rolled Al alloys. It has been validated by several tests involving (1) metallographic analysis of deformed samples; (2) flow stress comparisons with the same, or similar alloys deformed in conventional uniaxial or plane strain compression; and (3) microstructure and texture measurements. The use of modern lubricants enables one to obtain accurate flow stresses and true plane strain deformations that are homogeneous over 80 pct of the sample. The equipment also features rapid heating and cooling systems to minimize thermally-induced microstructure changes. Some results on high-temperature slip systems, hot deformation textures, and microstructures, and the behavior of constituent particles are outlined to illustrate the advantages of the technique

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“…The single crystal channel-die compression kinematics has been extensively studied by Sue and Havner [30]. The sketches presented in Figure 2a show a parallelepiped single crystal sample compressed within the E → 3 direction, constrained along E → 2 and a free displacement within E → 1 [30, 48, 49]. Due to the geometry of the channel-die, the test-piece undergoes the following displacements and shears along the deformation path (Figure 2b): (i) the shortening ( ε = − ε 3 ) along the normal axis E → 3 ; (ii) the extension ( ε 1 ) according to the flow axis E → 1 and (iii) the shear angles χ 2 ( …”

Section: Materials Rotating Frame Formulationmentioning

confidence: 99%

Material rotating frame, rate-independent plasticity with regularization of Schmid law and study of channel-die compression

Fathallah

Chenaoui

Darrieulat

et al. 2017

Mathematics and Mechanics of Solids

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Metals often exhibit several crystallographic components that rotate when subjected to large plastic deformation. Studying their evolution constitutes a prospect to apply the finite plastic strain theory. In this respect, this research paper formulates a three-dimensional extension of Dogui’s plane kinematics to choose a material rotating frame in which deformation and velocity tensor gradients are represented by upper triangular matrices. This technique facilitates numerical calculation and renders it faster. This can prove to be useful if used for crystalline calculation. We study the kinematics of a channel-die loading to implement the material rotating frame model. The rate-independent formulation, which uses the multi-surface theory to represent the plastic flow of crystals, often leads to slip indeterminacy. Hence, we have developed a phenomenological method to solve such a difficulty using the regularization of Schmid’s yield law. As a significant application of this proposed phenomenological approach, aluminium crystal flow in channel-die compression is numerically simulated for three cases of loadings: (i) classical rolling components Cube, Goss, Brass, Copper and Dillamore orientations; (ii) {110} compression; and (iii) Strange orientation, which has no common element of symmetry with the channel-die. A good correlation between the simulation results and the available experimental ones is observed.

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A mechanical analysis of the plane strain channel-die compression test: friction effects in hot metal testing

Cited by 22 publications

References 11 publications

Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

Hot plane strain compression testing of aluminum alloys by channel-die compression

Material rotating frame, rate-independent plasticity with regularization of Schmid law and study of channel-die compression

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