Bauschinger Effect or Kinematic Hardening: Bridging Microstructure and Continuum Mechanics

Bouaziz, Olivier; Kim, Hyoung Seop; Lee, Jungwan; Estrin, Yuri

doi:10.1007/s12540-022-01227-3

Cited by 14 publications

(3 citation statements)

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“…The internal stresses reduced the yield stress during load reversal. There are several mechanisms responsible for back stress [ 29 , 30 , 31 , 32 , 33 ]. Deformation incompatibility among the grains in the polycrystal is compensated via the generation of GNDs, which give rise to internal stresses.…”

Section: Resultsmentioning

confidence: 99%

A Polymer-Based Metallurgical Route to Produce Aluminum Metal-Matrix Composite with High Strength and Ductility

Gutta,

Huilgol,

Perugu

et al. 2023

Materials

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In this investigation, an attempt was made to develop a new high-strength and high-ductility aluminum metal–matrix composite. It was achieved by incorporating ceramic reinforcement into the metal which was formed in situ from a polymer by pyrolysis. A crosslinked PMHS polymer was introduced into commercially pure aluminum via friction stir processing (FSP). The distributed micro- and nano-sized polymer was then converted into ceramic particles by heating at 500 °C for 10 h and processed again via FSP. The produced composite showed a 2.5-fold increase in yield strength (to 119 MPa from 48 MPa) and 3.5-fold increase in tensile strength (to 286 MPa from 82 MPa) with respect to the base metal. The ductility was marginally reduced from 40% to 30%. The increase in strength is attributed to the grain refinement and the larger ceramic particles. High-temperature grain stability was obtained, with minimal loss to mechanical properties, up to 500 °C due to the Zenner pinning effect of the nano-sized ceramic particles at the grain boundaries. Fractures took place throughout the matrix up to 300 °C. Above 300 °C, the interfacial bonding between the particle and matrix became weak, and fractures took place at the particle–matrix interface.

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Section: Resultsmentioning

confidence: 99%

A Polymer-Based Metallurgical Route to Produce Aluminum Metal-Matrix Composite with High Strength and Ductility

Gutta,

Huilgol,

Perugu

et al. 2023

Materials

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“…The constitutive plasticity models have three main functions for estimating the stress-strain relationships for each type of loading. These functions are the yield function, the yield rule, and the hardening rule, which are based on a single loading path, usually under monotonic or cyclic uniaxial loading conditions [38][39][40][41][42][43]. However, when multiaxial loading is considered, the yield function, the hardening rule, and the yield rule vary in different ways, depending on the type and magnitude of the loading [32,44].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Cyclic Stress–Strain Behavior of the Magnesium Alloy AZ31B-F under Multiaxial Loading

et al. 2023

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Under strain control tests and cyclic loading, extruded magnesium alloys exhibit a special mechanism of plastic deformation (“twinning” and “de-twining”). As a result, magnesium alloys exhibit an asymmetric material behavior that cannot be fully characterized with the typical numerical tools used for steels or aluminum alloys. In this sense, a new phenomenological model, called hypo-strain, has been developed to correctly predict the cyclic stress–strain evolution of magnesium alloys. On this basis, this work aims to accurately describe the local cyclic elastic–plastic behavior of AZ31B-F magnesium alloy under multiaxial cyclic loading with Abaqus incremental plasticity. The phenomenological hypo-strain model was implemented in the UMAT subroutine of Abaqus/Standard to be used as a design tool for mechanical design. To evaluate this phenomenological approach, the results were correlated with the uniaxial and multiaxial proportional and non-proportional experimental tests. In addition, the estimates were also correlated with the Armstrong–Frederick nonlinear kinematic hardening model. The results show a good correlation between the experiments and the phenomenological hypo strain approach. The model and its implementation were validated in the strain range studied.

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“…In [25], the authors study the contribution of kinematic hardening based on the Bauschinger effect and attribute it to the low probability of cross-slip in such materials. A similar approach is used in modeling the Bauschinger effect in [26,27].…”

Section: Introductionmentioning

confidence: 99%

Structure Refinement and Bauschinger Effect in fcc and hcp Metals

Stolyarov

2023

Metals

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Although the Bauschinger effect has been investigated in some detail in various materials, the number of articles on the effect of grain size is extremely limited, and in current nanostructured materials it is practically absent. Since such materials are considered as promising for structural applications, it is important to understand their mechanical behavior under conditions of changing the direction of deformation, and, therefore, it is necessary to study the Bauschinger effect and its dependence on grain size. The Bauschinger effect was investigated by a single exemplary method for tensile compression of commercially pure hcp titanium and fcc copper, with different grain sizes in the range from hundreds of microns to hundreds of nanometers. The change in grain size was performed by structure refinement by the method of severe plastic deformation using equal-channel angular pressing and subsequent annealing. It has been established that, in both materials, the Bauschinger effect increases with a decrease in grain size, the degree of permanent strain and the duration of exposure between forward and reverse deformation. The signs of the Bauschinger parameter in copper and titanium are opposite. The relationship between the Bauschinger effect and the nature of strain hardening in titanium and softening in copper in the ultrafine-grained state is discussed.

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Bauschinger Effect or Kinematic Hardening: Bridging Microstructure and Continuum Mechanics

Cited by 14 publications

References 50 publications

A Polymer-Based Metallurgical Route to Produce Aluminum Metal-Matrix Composite with High Strength and Ductility

A Polymer-Based Metallurgical Route to Produce Aluminum Metal-Matrix Composite with High Strength and Ductility

Simulation of the Cyclic Stress–Strain Behavior of the Magnesium Alloy AZ31B-F under Multiaxial Loading

Structure Refinement and Bauschinger Effect in fcc and hcp Metals

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