Experimental investigation of plastic grain interaction

Sachtleber, M.; Zhao, Z.; Raabe, Dierk

doi:10.1016/s0921-5093(01)01974-8

Cited by 186 publications

(99 citation statements)

References 10 publications

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“…In order to measure the strain on the surface of the specimen in-situ, we applied the digital image correlation method (DIC) [21,25]. The DIC method is based on the recognition of geometrical changes in the gray scale distribution of surface patterns after straining.…”

Section: Digital Image Correlation Methodsmentioning

confidence: 99%

Lamination microstructure in shear deformed copper single crystals

Dmitrieva

Dondl²,

Müller³

et al. 2009

Acta Materialia

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We investigate the formation of microscopic patterns in a copper single crystal deformed in a shear experiment. Using high-resolution electron backscatter diffraction (EBSD) imaging, we find a band-like microstructure consisting of confined areas in the sample with rotated lattice. Digital image correlation (DIC) allows us to exactly determine the macroscopic state of deformation of the sample. This data can be used as a side condition to calculate the lamination parameters from the theory of kinematically compatible lamination of separate material regions, each deforming in single slip. The parameters given by the theory agree with the measured properties, i.e., a lattice rotation of 3 degrees and a lamination normal rotated 7 degrees counterclockwise from a 111 direction.

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Section: Digital Image Correlation Methodsmentioning

confidence: 99%

Lamination microstructure in shear deformed copper single crystals

Dmitrieva

Dondl²,

Müller³

et al. 2009

Acta Materialia

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“…The deformation behavior at the grain scale of polycrystalline aluminium in uniaxial tension was found to be non-uniform at the early stage of plastic straining and the plastic deformation within the grains was found to be inhomogeneous by Sachtleber et al [23]. With increasing applied strain, the deformation inhomogeneity of each grain and sub-grain increases [17].…”

Section: Introductionmentioning

confidence: 97%

Using the Hollomon Model to Predict Strain-Hardening in Metals

Nutor¹,

Adomako²,

Fang³

2017

AJMSP

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Stress -strain values obtained from tensile tests of aluminium and steel is used to evaluate the true stress -true strain values. The Hollomon's model is then used to predict the strain-hardening behavior in the two specimens. It is clearly seen that the strain-hardening behavior in metals can be described using the Hollomon's model. However, we have assumed that the onset of strain-hardening is at the yield point up until the ultimate tensile strength. The correlation between the experimental true stress -true strain values of aluminium and the calculated values using the Hollomon equation is much better than that of steel.

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“…The simple shear experiment was conducted at a constant shear rate of 10 ±6 s ±1 using the setup shown in Figure 1. The in-plane distribution of the accumulated von Mises equivalent plastic strain was determined on the sample normal surface using photogrammetry [2,12] . The strain was measured in a series of consecutive displacement steps of 0.1 mm each, up to a total shear displacement of 1.3 mm.…”

Section: Receivedmentioning

confidence: 99%

“…An important result of the strain measurement is that the simple shear test is indeed much more homogeneous than the lubricated plane strain tests, which are commonly used for crystal plasticity experiments (see for comparison data in Raabe et al, [1] Sachtleber et al, [2] and Raabe et al [5] ). Concerning the macroscopic boundary conditions we attribute this result to the absence of friction.…”

Section: Receivedmentioning

confidence: 99%

“…To date, there are few fabrication processes that can be used to synthesize bulk materials in these dimensions. [2] Cryomilling, mechanical milling at cryogenic temperature, is one of the few processing approaches available for the fabrication of large quantities of nanostructured materials, thereby making it possible for nanostructured materials to be commercialized. [3] Several researchers have found that the bulk nanostructured metals, [3] metal matrix nanocomposites, [4] and intermetallic compounds [5] prepared by cryomilling and subsequent consolidation steps have shown greatly improved mechanical properties compared to the conventional counterparts.…”

Section: Receivedmentioning

confidence: 99%

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Comparison of Single Crystal Simple Shear Deformation Experiments with Crystal Plasticity Finite Element Simulations

Roters¹,

Wang²,

Kuo³

et al. 2004

Adv Eng Mater

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polymer substrates. The type of conductive filler considerably determines the characteristics of nucleation, growth and the electroforming of the product microstructures.The development of an ideal 2-component combination, also besides the commercially available polymers, is necessary. Here, also the use of polymer material, which is intrinsically conductive because of the chemical polymer structure, will promise interesting results.A further important part of investigations will be the production of metallic mold inserts for the injection molding of templates of the important hole type and the following electroforming and replication.Electrochemical investigations like voltamograms i = f(E) and transients i = f(t) on the properties of conductive polymers will exhibit detailed qualitative and quantitative information about the processes at the interface polymer-electrolyte. This article presents an investigation on the evolution of the crystallographic texture and of the equivalent strain distribution during simple shear deformation of a pure Al single crystal. Previous studies in which we presented detailed comparisons between crystal plasticity finite element simulations and corresponding experiments under plane strain load revealed in part a disturbing influence of friction on the results. [1±6] This effect impedes the validation of advanced crystal plasticity finite element methods. ReceivedFriction between the tool and the specimen introduces two main problems into such tests rendering validation efforts a difficult task: First, it introduces additional shear stress components of unknown magnitude. Second, its magnitude changes during loading in an unknown fashion as deformation proceeds. Hence, a more quantitative approach lies in using simple shear deformation experiments since they do not involve friction.The structure of this article is as follows: First, we provide a concise review of earlier work on simple shear experiments. Second, we describe the experimental procedure. Third, we give a brief introduction to the model approach and explain how we determined the parameters of the underlying constitutive model. Fourth, we compare the experimental observations with the model predictions in terms of the texture evolution and the strain distribution.

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Experimental investigation of plastic grain interaction

Cited by 186 publications

References 10 publications

Lamination microstructure in shear deformed copper single crystals

Lamination microstructure in shear deformed copper single crystals

Using the Hollomon Model to Predict Strain-Hardening in Metals

Comparison of Single Crystal Simple Shear Deformation Experiments with Crystal Plasticity Finite Element Simulations

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