Dynamic Bauschinger effect

Thakur, Aniruddha; Nemat‐Nasser, Sia; Vecchio, Kenneth S.

doi:10.1016/1359-6454(95)00385-1

Cited by 28 publications

(11 citation statements)

References 7 publications

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“…The split-Hopkinson bar, which may be used in compression, tension and torsion testing, seems to be the most widespread method for material characterization at the crash relevant strain rates because a rather well-defined stress and strain state is feasible (e.g. Harding et al, 1960;Lindholm and Yeakley, 1968;Albertini and Montagnani, 1976;Nicholas, 1981;Staab and Gilat, 1991;Thakur et al, 1996;Verleysen and Degrieck, 2004).…”

Section: Introductionmentioning

confidence: 99%

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Chen

Clausen

Hopperstad

et al. 2009

International Journal of Solids and Structures

220

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a b s t r a c tThe stress-strain behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of strain rates. Tensile tests at low to medium strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress-strain behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of strain hardening, strain-rate hardening, thermal softening and plastic anisotropy.

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Section: Introductionmentioning

confidence: 99%

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Chen

Clausen

Hopperstad

et al. 2009

International Journal of Solids and Structures

220

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“…The Bauschinger effect has also been observed at very high strain rates (300s -1 ) by Thakur et al, (1996), who reported that metals that do not exhibit a Bauschinger effect in the quasi-static strain rate regime can exhibit a Bauschinger effect in very high strain rates regime. Sleeswyk and Kemerink (1985) explained the Bauschinger effect in terms of dislocations motion between barriers.…”

Section: Introductionmentioning

confidence: 87%

“…The Bauschinger effect has been found to be a function of several parameters (loading path, strain rate, temperature and texture) (Ono et al, 1983;Arsenault and Wu, 1987;Thakur and Nemat-Nasser, 1996;). The physical sources attributed to the Bauschinger effect during the reverse loading of a material can be generalized into longrange and short-range transients.…”

Section: Introductionmentioning

confidence: 99%

Damage and stress state influence on the Bauschinger effect in aluminum alloys

Jordon

Horstemeyer

Solanki

et al. 2007

Mechanics of Materials

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In this work, the Bauschinger effect is shown to be intimately tied not only to plasticity but to damage as well. The plasticity-damage effect on the Bauschinger effect is demonstrated by employing different definitions (Bauschinger Stress Parameter, Bauschinger Effect Parameter, the Ratio of Forward-to-Reverse Yield, and the Ratio of Kinematic-to-Isotropic Hardening) for two differently processed aluminum alloys (rolled and cast) in which specimens were tested to different prestrain levels under tension and compression. Damage progression from second phase particles and inclusions that were generally equiaxed for the cast A356-T6 aluminum alloy and elongated for the rolled 7075 aluminum alloy was quantified from interrupted experiments. Observations showed that the Bauschinger effect had larger values for compression prestrains when compared to tension. The Bauschinger effect was also found to be a function of damage to particles/inclusions, dislocation/particle interaction, the work hardening rate, and the Bauschinger effect definition. ii ACKNOWLEDGMENTS

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“…Research on tensile and compressive high strainrate testing has been developed (Lindholm and Yeakley, 1968) as well as the wave-propagation effects in dynamic loading (Albertini and Montagnani, 1976). Although different authors have been testing materials at high-strain rates (Nicholas, 1981;Staab and Gilat, 1990), and experimental research of the deformation of Hopkinson bar specimens have been accomplished (Thakur et al, 1996;Verleysen and Degrieck, 2004), the novelty of this research with respect to previous studies lies in the fact that the dynamic tension experiment in a SHTB is interrupted in order to study the mechanical behavior of the material at high strain rates. Other studies have been modifying the classic Hopkinson bar testing (Gray et al, 2000;Swantek et al, 2001) as well as designing new split Hopkinson tensile bars (Gerlach et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the influence of the damping rings' thickness on interrupted dynamic tension results using SiC-reinforced ZC71 magnesium alloy specimens

Lezcano

Campos²

2019

Mech. Sci.

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This article discusses the influence of the thickness of the damping rings used for interrupting a dynamic tension experiments on the results of a modified split Hopkinson tension bar (SHTB). In this paper a device enclosed in an external fixture used for interrupting a dynamic tension experiment in a SHTB is studied. The novelty of this manuscript with respect to previous studies lies in the fact that the dynamic tension experiment in a SHTB is interrupted in order to study the mechanical behavior of the material at high strain rates. The role played by such device is to interrupt the experiment at different levels of plastic deformation, particularly when the specimen is about to reach its failure strength. Finite-element (FE) simulations of high-strain-rate tension experiments are accomplished on a particle-reinforced metal matrix composite specimen (namely SiCreinforced ZC71 magnesium alloy) when varying the thickness of the damping rings. Interrupting the test before the specimen breaks offers the possibility of being able to study in a more detailed way the deformation process of such material at high strain rates. Therefore, this work focuses on the study of the behaviour of materials undergoing high strain rates, developing a tool which allows materials to withstand different levels of strain rates in a controlled manner and providing guidance for future studies. In view of this research, it can be concluded that the thickness of the damping rings is a factor that can resolutely influence the interrupted dynamic tension experiment results avoiding the specimen's failure by optimally buffering the experiment using 0.8 mm thick lead damping rings.Published by Copernicus Publications.

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Dynamic Bauschinger effect

Cited by 28 publications

References 7 publications

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Damage and stress state influence on the Bauschinger effect in aluminum alloys

Numerical analysis of the influence of the damping rings' thickness on interrupted dynamic tension results using SiC-reinforced ZC71 magnesium alloy specimens

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