Investigation into the shear stress, localization and fracture behaviour of DP600 and AA5182-O sheet metal alloys under elevated strain rates

Rahmaan, Taamjeed; Abedini, Armin; Butcher, Cliff; Pathak, Nikky; Worswick, Michael J.

doi:10.1016/j.ijimpeng.2017.04.006

Cited by 75 publications

(47 citation statements)

References 39 publications

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“…The shear specimens were fabricated at -56° to the TD so that the principal stress direction was aligned with the TD and consistent with the tensile tests. The shear experiments were performed to obtain tensile constitutive response beyond UTS, following the procedure outlined in [3], the tensile-to-shear stress ratio is computed at the plastic work corresponding to the UTS. Assuming that shear anisotropy does not evolve beyond the UTS work level, this stress ratio is then used to convert the shear stress to an equivalent tensile stress.…”

Section: Experimental Methods and Proceduresmentioning

confidence: 99%

“…After postprocessing was completed, a user defined virtual extensometer was used to determine the engineering strain. The strain fields in the mini-shear specimens were analysed using the detailed procedures described in [3].…”

Section: Experimental Methods and Proceduresmentioning

confidence: 99%

“…This paper presents the experimental procedures and results of these tests, together with the fitting of the data to the Johnson-Cook (JC) [1] and Cowper-Symonds (CS) [2] models. To ensure the constitutive data is suitable for vehicle crash applications, the quasi-static hardening curves are obtained experimentally to strains of 50% using both tensile and shear tests using the methodology recently proposed by Rahmaan et al [3].…”

Section: Introductionmentioning

confidence: 99%

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High Rate Characterization of Three DP980 Steels

et al. 2018

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Advanced high strength steels (AHSS) are used extensively in the automotive industry in the ongoing effort to reduce vehicle weight. Their increased strength allows for the reduction of sheet thickness, and thus a reduction in mass, while offering formability and cost advantages when compared to other metal alloys typically considered for lightweight applications. DP980 steels are AHSS being considered for structural energy absorbing components; however, there is a lack of published information on their high rate behaviour. This paper presents the results of an experimental program that characterized three production DP980 steels from three different manufacturers at strain rates of 0.001, 1, 10, 100 and 1,000 s-1. An electro-mechanical frame was used for the quasi-static tests, the 1, 10, and 100 s-1 tests were carried out using a fast hydraulic apparatus and the 1,000 s-1 experiments were carried out using a tensile split Hopkinson bar. The quasi-static hardening response at strains higher than the uniform elongation of about 7% was obtained by using a shear test, thus avoiding the use of inverse modelling techniques. The results indicate that the DP980 steels are moderately rate sensitive, with one of the materials showing higher sensitivity than the others. One of the materials exhibited a yield point phenomenon that appears to affect the behaviour of the material at 100 and 1,000 s-1, however, the reasons for this behaviour remain an open question. The data was fit to modified Johnson-Cook and Cowper-Symonds model to account for rate sensitivity. The results presented in this paper provide a tool for modelling the dynamic behaviour of DP980 steels.

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Section: Experimental Methods and Proceduresmentioning

confidence: 99%

Section: Experimental Methods and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Rate Characterization of Three DP980 Steels

et al. 2018

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“…Yu et al [159] conducted quasi-static strain rate tests from 10 −4 to 10 −2 s −1 and dynamic tensile tests at strain rates 500, 1100, and 1600 s −1 for DP 600 steel and observed the yield strength at high strain rates to be approximately twice that in the quasi-static strain rates, as shown in Figure 27. Earlier studies have been carried out to investigate the effect of temperature and strain rates on the deformation behaviour of DP steels [158][159][160][161][162][163][164][165][166]. Cao et al [158] performed tensile tests at varying strain rates (10 −4 to 10 2 s −1 ) and temperature ranging from −60 to 100 °C on DP800 grade steel.…”

Section: Dual-phase (Dp) Steel and Micro-alloyed Steelmentioning

confidence: 99%

Structure–Property Correlation and Constitutive Description of Structural Steels during Hot Working and Strain Rate Deformation

Prusty

Banerjee

2020

Materials

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The behaviour of plain carbon as well as structural steels is qualitatively different at different regimes of strain rates and temperature when they are subjected to hot-working and impact-loading conditions. Ambient temperature and carbon content are the leading factors governing the deformation behaviour and substructural evolution of these steels. This review aims at investigating the mechanical behaviour of structural (or constructional) steels during their strain rate (ranging from very low to very high) as well as hot-working conditions and subsequently establishing the structure–property correlation. Rate-dependent constitutive equations play a significant role in predicting the material response, particularly where the experiments are difficult to perform. In this article, an extensive review is carried out on the merits and limitations of constitutive models which are commonly used to model the deformation behaviour of plain carbon steels.

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“…Depending on the size of the specimens, different types of lenses were utilized, resulting in various image resolutions while a virtual strain gauge length (VSGL) of 0.3 mm was used for all the tests (Table 3). More information regarding the VSGL size and its influence on the DIC strain measurements can be found in Reu [57] and Rahmaan et al [58]. The commercial VIC3D DIC (7.2.4) software from Correlated Solutions, Inc. was used for the DIC analysis.…”

Section: Strain Measurementsmentioning

confidence: 99%

Application of an Evolving Non-Associative Anisotropic-Asymmetric Plasticity Model for a Rare-Earth Magnesium Alloy

Abedini

Butcher

Worswick

2018

Metals

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Magnesium sheet metal alloys have a hexagonal close packed (hcp) crystal structure that leads to severe evolving anisotropy and tension-compression asymmetry as a result of the activation of different deformation mechanisms (slip and twinning) that are extremely challenging to model numerically. The low density of magnesium alloys and their high specific strength relative to steel and aluminum alloys make them promising candidates for automotive light-weighting but standard phenomenological plasticity models cannot adequately capture the complex plastic response of these materials. In this study, the constitutive plastic behavior of a rare-earth magnesium alloy sheet, ZEK100 (O-temper), was considered at room temperature, under quasi-static conditions. The CPB06 yield criterion for hcp materials was employed along with a non-associative flow rule in which the yield function and plastic potential were calibrated for a range of plastic deformation levels to account for evolving anisotropy under proportional loading. The non-associative flow rule has not previously been applied to magnesium alloys which require the use of flexible constitutive models to capture the severe anisotropy and its evolution with plastic deformation. The non-associative flow rule can provide the required flexibility by decoupling the yield function and plastic potential. For the associative flow rule, such flexibility can only be achieved by multiple linear transformations of the stress tensor resulting in expensive models for calibration and simulations. The constitutive model was implemented as a user material subroutine (UMAT) within the commercial finite element software, LS-DYNA, for general 3-D stress states along with an interpolation technique to consider the evolution of anisotropy based upon the plastic work. To evaluate the accuracy of the implemented model, predictions of a single-element model were compared with the experimental results in terms of flow stresses and plastic flow directions under various proportional loading conditions and along different test directions. Finally, to assess the predictive capabilities of the model, full-scale simulations of coupon-level formability experiments were performed and compared with experimental results in terms of far-field load-displacement and local strain paths. Using these experiments, the constitutive model was evaluated across the full range of representative stress states for sheet metal forming operations. It was shown that the predictions of the model were in very good agreement with experimental data.

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Investigation into the shear stress, localization and fracture behaviour of DP600 and AA5182-O sheet metal alloys under elevated strain rates

Cited by 75 publications

References 39 publications

High Rate Characterization of Three DP980 Steels

High Rate Characterization of Three DP980 Steels

Structure–Property Correlation and Constitutive Description of Structural Steels during Hot Working and Strain Rate Deformation

Application of an Evolving Non-Associative Anisotropic-Asymmetric Plasticity Model for a Rare-Earth Magnesium Alloy

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