Correction of plane strain compression data for the effects of inhomogeneous deformation

Kowalski, B.I.; Lacey, A. J.; Sellars, C. M.

doi:10.1179/026708303225008130

Cited by 16 publications

(20 citation statements)

References 8 publications

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“…From finite element modeling, [24] a correction procedure has been developed to relate the flow stress to the slip line field strain rate and strain. [25] This modifies the stress strain curves and eliminates the geometry effect, so that the corrected curves give constitutive equations that reflect the true material behavior and can be applied accurately in modeling any type of hot deformation process. Equations [3] through [6], and [9] and [10], have been corrected using the preceding procedure, and the new Fig.…”

Section: Discussionmentioning

confidence: 99%

Modeling the Flow Behavior, Recrystallization, and Crystallographic Texture in Hot-Deformed Fe-30 Wt Pct Ni Austenite

Abbod

Sellars

Čížek

et al. 2007

Metall Mater Trans A

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The present work describes a hybrid modeling approach developed for predicting the flow behavior, recrystallization characteristics, and crystallographic texture evolution in a Fe-30 wt pct Ni austenitic model alloy subjected to hot plane strain compression. A series of compression tests were performed at temperatures between 850°C and 1050°C and strain rates between 0.1 and 10 s -1 . The evolution of grain structure, crystallographic texture, and dislocation substructure was characterized in detail for a deformation temperature of 950°C and strain rates of 0.1 and 10 s -1 , using electron backscatter diffraction and transmission electron microscopy. The hybrid modeling method utilizes a combination of empirical, physically-based, and neuro-fuzzy models. The flow stress is described as a function of the applied variables of strain rate and temperature using an empirical model. The recrystallization behavior is predicted from the measured microstructural state variables of internal dislocation density, subgrain size, and misorientation between subgrains using a physically-based model. The texture evolution is modeled using artificial neural networks.

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Section: Discussionmentioning

confidence: 99%

Modeling the Flow Behavior, Recrystallization, and Crystallographic Texture in Hot-Deformed Fe-30 Wt Pct Ni Austenite

Abbod

Sellars

Čížek

et al. 2007

Metall Mater Trans A

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“…The PTFE is known to possess very low friction coefficients up to temperatures of about 400 °C. For example, Kowalski et al [3] use a friction coefficient of 0.001 for hot "PSC" tests of Al alloys lubricated by PTFE. However, although PTFE stretches and deforms with the sample as required, it can undergo localized tearing at strains typically of unity.…”

Section: A Lubricationmentioning

confidence: 99%

“…Fluctuating stresses at high strain rates, as shown by the PSC II curve, are usually due to nonconstant plastic strain [5] Fig. 5-The saturation flow stresses as a function of ln Z for AA 5052 as measured independently by CDC and hot PSC-punching [3] tests at 300 °C to 450 °C and strains of unity.…”

Section: B Validationmentioning

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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“…This is very important considering that the flow stress is directly linked to the temperature and the code selects a particular value of the stressstrain curve at any time depending on the current temperature according to equation (2).…”

Section: Discussionmentioning

confidence: 99%

“…2 Metallurgical studies require that a small sample is taken from a part of the deformed test specimen where deformation is fairly uniform so allowing the correlation between the observed metallurgical changes and the local mechanical state. Typically, after a compression test has been performed, a small specimen (usually 10610 mm) is cut from the middle of the sample and used for texture and microstructure studies.…”

Section: Introductionmentioning

confidence: 99%

Measurement and prediction of deformation in plane strain compression tests of AA5182

Boldetti¹,

Pinna²,

Howard³

2006

Materials Science and Technology

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The present paper concerns the numerical prediction and experimental measurement of the distribution of strain in a plane strain compression test by means of a gridded insert. The insert was engraved with a 161 mm grid pitch and was embedded in an AA5182 sample. The tests were performed at 400uC with a reduction ratio of y20% and at a strain rate of 0 . 7 s 21. A thermocouple was used to record the temperature during the test. After the test, no detachment was observed between insert and sample, suggesting a close contact between them. The shape of the grid after deformation was analysed, and the in-plane component of the plastic strain calculated and compared with the numerical results obtained through finite element modelling of the test. In a comparison between experimental data and the results of a finite element (FE) model of the test that assumed perfect tool alignment, the fields of temperature agreed very well, while that for the in-plane component of strain was reasonable but inaccurate. However, significant misalignment of the tools was found in the experiments (a common occurrence in plane strain compression testing). When comparison was made with an FE model that included the geometry of the tool misalignment, the agreement was excellent. The paper discusses these effects and others such as the influence of 3D effects in the modelling.

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Correction of plane strain compression data for the effects of inhomogeneous deformation

Cited by 16 publications

References 8 publications

Modeling the Flow Behavior, Recrystallization, and Crystallographic Texture in Hot-Deformed Fe-30 Wt Pct Ni Austenite

Modeling the Flow Behavior, Recrystallization, and Crystallographic Texture in Hot-Deformed Fe-30 Wt Pct Ni Austenite

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

Measurement and prediction of deformation in plane strain compression tests of AA5182

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