Deformation of Polycrystalline Aluminium at High Strain Rates

Yoshida, Susumu; Nagata, Norio

doi:10.2320/matertrans1960.7.273

Cited by 19 publications

(4 citation statements)

References 13 publications

(6 reference statements)

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“…The apparatus and the m ethod of stress ana lysis h ave been d escribed elsew here. 7 ) Sta tic compression tests w ere performed b y a n Instron type machine usin g sp ecim ens of th e sam e dimension . T esting tempera tures w ere 77° to 5 73°K .…”

Section: Specimens and Exp Erimental Proceduresmentioning

confidence: 99%

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Strain Rate, Temperature, and Grain Size Dependence of the Lower Yield Stress of Polycrystalline Iron

1970

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Syn op sisThe strain rate, temperature , and grain size dependence of the lower yield stress ~r /Jolycrystalline iron containing 0.002 to 0.05 wt % carbon has been investigated by cOIn/Jression tests at temjJeratures ranging from 77° to 573°K and over strain rates ranging from 3.3 X 10-5 to 4 X 10 3 sec-I.The strain rate and tem/Jerature dejJendence of the lower yield stress is independent of grain size and carbon content. The rela tion between the eifective stress and the activation volume agrees /1;ell u 'ith the various results obtainedfrom the tests at low strain rates for var..ving temperatures. From these results it is concluded that the diformation of iron over the strain rates and temperatures tested is controlled by the single thermally activated process, which is /Jresumed to be the overcoming of the Peierls-.Nabarro barrier by the moving dislocations.The e.!feet of grain siz e on twinning and the effect of SO/l1te interstitial atoms on k y in the Petch equation are discussed.

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Section: Specimens and Exp Erimental Proceduresmentioning

confidence: 99%

“…2). Moreover, Hull has shown that there exists a linear relationship !l (t) = !l ilt) + k w d-L /2 .......... ... ... ..... (7) between the external stress !l ( t) which is necessary for twinning to occur and d-L / 2 similarl y to Eq. ( I ).…”

Section: Grain Size D Ependence Of the L Ower Y Ield Stressmentioning

confidence: 99%

Strain Rate, Temperature, and Grain Size Dependence of the Lower Yield Stress of Polycrystalline Iron

1970

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“…In addition, the interaction between a slip band and a grain boundary can lead to dislocation emission from the grain boundary on a new slip plane as expressed in [10]. As seen for single crystals, temperature, and strain rate also play a major role in slip band formation [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Simulation of intragranular plastic deformation localization in FCC polycrystals by Discrete Dislocation Dynamics

Joste,

Devincre,

Gatti

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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Strain localization mechanisms taking place in polycrystal grains are investigated using Discrete Dislocation Dynamics (DDD) simulations. First, elastic Finite Element Method (FEM) simulations are used to calculate the intragranular stress distribution linked to strain incompatibilities between grains. Many configurations are tested to evaluate the stress heterogeneity and constitute a database for DDD simulations. From the analysis of these microstructures, a criterion is proposed to identify the grains where the emergence of the localization of the deformation is the most likely. Then, DDD simulations are used to explore the plastic strain localization phenomenon at the grain scale. Those simulations show that stress concentrations close to a polycrystal quadruple node can play a fundamental role in plastic strain localization. This work paves the way for future investigations to be made thanks to DDD simulations regarding slip band initiation and strain relaxation phenomena.

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“…In comparison with the impact tension test, the present experimental procedure is expected to permit a more accurate measurement of stress and strain in the specimen, especially in regard to the initial stage of deformation (1). Moreover, as the deformation of the specimen can be interrupted at any amount of strain before fracture, observation of slip patterns under such a condition is made possible.…”

Section: Introductionmentioning

confidence: 99%

Deformation of Aluminium Single Crystals at High Strain Rates

Yoshida

Nagata

1967

Trans. JIM

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The dynamic deformation behaviour of aluminium single crystals (99.99% purity) was investigated by compression tests at room temperature using a bar-bar type impulsive loading apparatus. The dynamic stress-strain relation at strain rates of the order offff off order ofe order off 102See-1 shows a similar orientation dependence to the static one. Crystals properly oriented for single slip under dynamic deformation show higher critical resolved shear stresses and more extensive easy glide regions than those under static deformation. The values of the critical resolved shear stresses for dynamic deformation range from 250g/mm2 to 500g/mm2. The rate of work hardening of stage II is shown to be higher for the dynamic deformation than for the static one. Microscopic observations on slip markings reveal that the dynamically deformed specimens have slip bands which are higher in density and weaker in contrast than the statically deformed ones.On the basis of the above results, it is pointed out that for the easy glide region of deformation at high strain rates the frictional stress acting on moving dislocations becomes too large to be negligible and contributes greatly to the critical resolved shear stress and the flow stress.

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Deformation of Polycrystalline Aluminium at High Strain Rates

Cited by 19 publications

References 13 publications

Strain Rate, Temperature, and Grain Size Dependence of the Lower Yield Stress of Polycrystalline Iron

Strain Rate, Temperature, and Grain Size Dependence of the Lower Yield Stress of Polycrystalline Iron

Simulation of intragranular plastic deformation localization in FCC polycrystals by Discrete Dislocation Dynamics

Deformation of Aluminium Single Crystals at High Strain Rates

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