Effect of deformation mode and grain size on Bauschinger behavior of annealed copper

Mahato, Jayanta Kumar; De, Partha Sarathi; Sarkar, Amit; Kundu, Atanu; Chakraborti, P.C.

doi:10.1016/j.ijfatigue.2015.04.023

Cited by 27 publications

(11 citation statements)

References 36 publications

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“…[47] As cyclic straining favors dislocation annihilation in relation to monotonic strain paths, the backstress, for a given total strain, will be lower under cyclic deformation with low strain amplitudes, thus affecting the Bauschinger effect. [48] Higher strain amplitudes and accumulated strains also favor dislocation annihilation within the UFG structures generated during SPD. As a result, the microstructure of Cu specimens deformed under higher Δε will exhibit an extended free path for the moving dislocations unlocked due to changes in the strain path.…”

Section: Flow Properties and Bauschinger Effectmentioning

confidence: 99%

Influence of Strain Amplitude on the Microstructural Evolution and Flow Properties of Copper Processed by Multidirectional Forging

et al. 2020

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The search for the development of metals with high mechanical strength has raised intense interest in severe plastic deformation (SPD) methods. [1,2] These involve the application of intense straining to ultimately produce ultrafine-grained (UFG) materials. Among the available SPD techniques, multidirectional forging (MDF) [3-5] is one of the simplest procedures and can be readily applied in industry. During MDF processing, a cuboid workpiece is successively submitted to the same compression strain along its three orthogonal axes, so that after each three compressions (a so-called MDF cycle) the dimensions of the sample return to the unprocessed state. [4,6] MDF processing allows the determination of the material in situ stressstrain curves for every compression step and can be performed with or without the use of dies confining the plastic flow. [3,7] Although the grain refinement mechanisms associated with SPD are still not fully understood, it is generally accepted that it is caused by the fragmentation of the original grains in the material by boundaries formed from dislocation arrangements created during straining. [8] Sakai et al. [3] have emphasized the importance of the development of micro shear bands (MSBs), which are localized planar sheared regions within the initial grains, in the development of UFG structures in metals processed by different SPD procedures [3,7,9-18] This microstructural evolution is also referred to in the literature as continuous dynamic recrystallization [3,7,9,12,19] and the successive deformation at mutually orthogonal

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Section: Flow Properties and Bauschinger Effectmentioning

confidence: 99%

Influence of Strain Amplitude on the Microstructural Evolution and Flow Properties of Copper Processed by Multidirectional Forging

et al. 2020

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“…The Mroz [24] conclude that multiple surface model can be used to model the influence of the Bauschinger effect. To improve the prediction of springback, the Bauschinger effect has been considered by, Kuwabara et al [9], Gau and Kinzel [10], I.Burchitz [11], Ning Ma [13], Mahato [25] and Sumikawa et al [26].…”

Section: B Orowan Theorymentioning

confidence: 99%

Bauschinger Effect in spring Back Prediction of High Strength Steel: A Theoretical Approach

K¹

2018

IJRASET

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Press formed components are in huge demand now a days. Especially high strength steels are widely acceptable by different industries because of their high weight to strength ratio. Due to Poor formability, it is quite difficult to work with high strength steels. Dimensional inaccuracy is main concern with the metals having poor formability which leads to springback. So for better control over dimensions especially in assembled component springback must be predicted in advance. Accurate Springback prediction is a very crucial for commercial aspect. Many of process parameter directly or indirectly influences the springback during forming process of high strength process. Bauschinger effect is one of parameter which play important role during forming process. Many researchers already develop springback prediction model but most of them avoid consideration of Bauschinger effect due to complexity involved in Bauschinger effect. The springback results obtained from such model are far away when we consider them with experimental results. So it is very crucial to consider Bauschinger effect during springback prediction which gives near by results with experimental results. This paper deals with theories of Bauschinger effect and its impact on springback prediction modelling. Keywords: Bauschinger effect, Springback, Bending, formability, High strength steel I. INTRODUCTIONHigh strength steel covered majority share in sheet metal industries in last few years due to its good strength to weight ratio. High strength and advance high strength steel are in high demand especially in automotive and aerospace industries. While dealing with sheet metal process, springback is the one of the most critical issue. High strength steel offers a higher rate of springback because springback rate is increase with material strength. Springback is a shape change of final geometry after removal of load. It is an elasticity driven incident which is mostly manages by the stress state obtained at the end of a deformation. Depending on the product geometry and deformation regime, there are several types of springback in sheet metal forming: bending, membrane, twisting and combined bending and membrane [1]. Springback is a phenomenon to describe the elastic recovery of sheet metal after a forming operation in which the strip unbends itself after forming. Sheet metals are prone to some amount of springback due to elastic deformation. Springback prediction is a major issue for the sheet metal manufacture to evaluate the desired shape of a product. Springback refers to the shape discrepancy between the fully loaded and unloaded configurations.[2] Accurate prediction and controlling of spring back is essential in the design of tools for sheet metal forming. High strength steel sheets have played a key role in weight reduction for environmental considerations and improved crashworthiness in the automotive industry in recent years. But at the same time sheet metal forming of high strength steel is itself a critical issue since such high stren...

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“…Mahato et al [8] investigated the effects of model size and strain rate on the stress-strain relationship of single-crystal copper at the nanoscale by molecular dynamics method and obtained the critical strain rate of single-crystal copper. They believed that dislocation nucleation was the major mechanism responsible for the material fracture.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Crack Propagation in Single-Crystal Aluminum Plate with Central Cracks

Ding

Lu-sheng

Song

et al. 2017

Journal of Nanomaterials

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The crack propagation process in single-crystal aluminum plate (SCAP) with central cracks under tensile load was simulated by molecular dynamics method. Further, the effects of model size, crack length, temperature, and strain rate on strength of SCAP and crack growth were comprehensively investigated. The results showed that, with the increase of the model size, crack length, and strain rate, the plastic yield point of SCAP occurred in advance, the limit stress of plastic yield decreased, and the plastic deformability of material increased, but the temperature had less effect and sensitivity on the strength and crack propagation of SCAP. The model size affected the plastic deformation and crack growth of the material. Specifically, at small scale, the plastic deformation and crack propagation in SCAP are mainly affected through dislocation multiplication and slip. However, the plastic deformation and crack propagation are obviously affected by dislocation multiplication and twinning in larger scale.

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Effect of deformation mode and grain size on Bauschinger behavior of annealed copper

Cited by 27 publications

References 36 publications

Influence of Strain Amplitude on the Microstructural Evolution and Flow Properties of Copper Processed by Multidirectional Forging

Influence of Strain Amplitude on the Microstructural Evolution and Flow Properties of Copper Processed by Multidirectional Forging

Bauschinger Effect in spring Back Prediction of High Strength Steel: A Theoretical Approach

Molecular Dynamics Simulation of Crack Propagation in Single-Crystal Aluminum Plate with Central Cracks

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