Analysis of stress states in compression stage of high pressure torsion using slab analysis method and finite element method

Wang, Wenke; Song, Yuepeng; Gao, Dongsheng; Yoon, Eun Yoo; Lee, Jun Young; Lee, Chong Soo; Kim, Hyoung Seop

doi:10.1007/s12540-013-5014-2

Cited by 20 publications

(6 citation statements)

References 25 publications

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“…Numerous attempts have been made to analyze the HPT process experimentally and numerically but theoretical analyses are rare. Wang et al 23 made an attempt to use slab method for studying the compression stage of HPT.…”

Section: Related Workmentioning

confidence: 99%

Simulation of softening in high pressure torsion process using continuum damage mechanics model

Katiyar

Dixit

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Severe Plastic Deformations (SPD) processes are used for grain refinement without any loss in ductility. Among various SPD processes, High Pressure Torsion (HPT) is extensively used in industries due to generation of high angle grain boundaries and cost effectiveness. Very little work has been reported on the numerical analysis of softening with recovery that might occur in a work-piece undergoing HPT. The present work is an attempt to study the softening behaviour in HPT processed mild steel and aluminium alloy using the Lemaitre’s continuum damage mechanics (CDM) model. This model is implemented in ABAQUS/Explicit through a user defined material model subroutine (VUMAT). A parametric study is carried out to study the effect on softening of various parameters like the compressive load, the friction at the die-workpiece interface, and the height to diameter ratio. Information about the softening with recovery provides an insight into the hardness and microstructure homogeneity in HPT processed work-piece, which is useful in the design of HPT process.

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Section: Related Workmentioning

confidence: 99%

Simulation of softening in high pressure torsion process using continuum damage mechanics model

Katiyar

Dixit

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Presently, there are at least three aspects existing controversy in HPT field: Firstly, HPT processing consists of two stages (compression stage and torsion stage under high pressure stages, as shown in Figure 1). Most of the reports published focused on the last stage [32,[36][37][38], but there are few researchers directly on the role of compressive processing stage [39,40]; second, because the developed strain at the center of the disk is theoretically zero and linearly increases with the distance from the center according to the characteristics of torsional strain, it is reasonable to anticipate that the microstructures produced by the HPT process will be extremely inhomogeneous. However, recently, papers demonstrated that the microstructure is reasonably homogeneous across the disks when the torsional straining continues; at last, although a lot of studies have been done on HPT [32,[36][37][38][39][40], most of them are for microstructure and its Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic... http://dx.doi.org/10.5772/intechopen.68360 characterization or for processing.…”

Section: Severe Plastic Deformation Techniquesmentioning

confidence: 99%

Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic Deformation Inhomogeneous Characteristics

Song¹,

Wang²,

Chen³

et al. 2017

Severe Plastic Deformation Techniques

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Utilization of severe plastic deformation (SPD) methods has provided a convenient approach for producing ultrafine-grained (UFG) materials exhibiting outstanding characteristics especially mechanical properties. HPT as one of the SPD methods can lead both to smaller grains and to a higher fraction of high-angle grain boundaries, which is an especially attractive procedure by researchers. In order to understand the nonlinearities relationship between the mechanical properties and the developed strain during plastic deformation, local deformation analysis using the finite element methodwas applied for the HPT process. In this chapter, results are reported of an investigation on the deformed microstructure and mechanical properties of different materials samples during the HPT process using experiments and FEM simulations. Simulation results indicate that the disks show inhomogeneity development and distribution of strain and stress during the plastic deformation. Microstructure and hardness investigation results can give a well support to verify the rules of inhomogenous plastic deformation in the early stage of the HPT disks. Furthermore, the friction and anvil geometry play important roles in the homogeneity of the deformation. After the hollow cone high pressure torsion (HC-HPT), the thermal stability of Zr 64.13 Cu 15.75 Ni 10.12 Al 10 BMGs is enhanced, while the elastic modulus of BMG will be decreased.

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“…In the past, FEM simulations of the SPD processes were performed with the purpose of analysis and optimization of the SPD processing variables and prediction of the mechanical and microstructural characteristics of the SPD processed samples [15]. For example, for HPT, the effects of processing parameters, such as geometries of the disc [28], applied pressure [29], temperature distribution [30,31], rotation rate [31], friction conditions [32], material porosity and properties [32,33] and slope of the inclined anvil's surface [34] on the plastic strain behavior were reported in the literature extensively. This work is devoted to study the behavior of polymethyl-methacrylate (PMMA) during HPT process.…”

Section: Introductionmentioning

confidence: 99%

Finte element modeling of the behavior of polymethyl-methacrylate (PMMA) during high pressure torsion process.

Draï

Aour

Belayachi

et al. 2020

Frattura Ed Integrità Strutturale

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High Pressure Torsion (HPT) is a highly effective super-plastic deformation process for obtaining nano-materials with high performance mechanical properties. In view of its optimization, it is of paramount importance to evaluate the relations between the behavior of the material under the effects of different processing parameters. In this context, this work aims to highlight the plastic strain distribution in the deformed material as a function of the hydrostatic pressure, the torsion angle and the temperature of the material applied during the process. A typical amorphous polymer (Polymethyl-Methacrylate: PMMA) has been tested. Firstly, in order to identify the material parameters of a phenomenological elasto-viscoplastic model compression tests at different temperatures and strain rates have been carried out. Then, the distributions of the effective plastic strain, the equivalent plastic strain rate and the hydrostatic stress were analyzed using finite elements method. Recommendations on process conditions were

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Analysis of stress states in compression stage of high pressure torsion using slab analysis method and finite element method

Cited by 20 publications

References 25 publications

Simulation of softening in high pressure torsion process using continuum damage mechanics model

Simulation of softening in high pressure torsion process using continuum damage mechanics model

Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic Deformation Inhomogeneous Characteristics

Finte element modeling of the behavior of polymethyl-methacrylate (PMMA) during high pressure torsion process.

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