Interactive effect of stress state and grain size on fracture behaviours of copper in micro-scaled plastic deformation

Li, Wen Ting; Li, Hengyun; Fu, Ming

doi:10.1016/j.ijplas.2018.10.013

Cited by 42 publications

(2 citation statements)

References 40 publications

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“…The sign of the third invariant of the bias stress tensor, J 3 , can be used to qualitatively determine the direction of the shear stress and the type of strain that the object is subjected to [28] , and the form of damage to the unit cell by the bias stress sign is shown in Table 1.…”

Section: Characteristics Of Deformation and Damage Of The Peripheral ...mentioning

confidence: 99%

Deformation and failure law and control technology of roadway surrounding rock in island working face based on distribution characteristics of deviatoric stress invariant

Jing,

Wang,

Wang

et al. 2024

Preprint

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In view of the severe problem of mine pressure behavior under the influence of mining stress superposition on both sides of the working face, this paper takes the isolated working face of Shanxi Yangquan H-N Coal Mine as the research object, and uses FLAC3D numerical simulation software to study the evolution of the plastic zone of the mining roadway in the isolated working face, the distribution of the second invariant field of the partial stress and the distribution of the third invariant field of the partial stress. The results show that there is a large-scale non-uniform failure in the roadway within 15 m of the advanced working face, and the plastic zone of the negative side and the floor appears through the phenomenon. The plastic zone at the roof extends to the positive side, and the shape is ' eagle beak '. The distribution pattern of J2 is basically consistent with the distribution pattern of plastic zone; According to the distribution pattern of J3, within 15 m from the working face, large compressive strain appears in the deep part of both sides of the roadway, and a certain range of tensile strain appears in the shallow part of the roadway. The J2 distribution of roof and floor of mining roadway is ' inverted trapezoid ' distribution, and both sides of roof and floor are more prone to large damage. The J3 distribution of floor of mining roadway is ' trapezoid ' distribution, both sides of floor are in compressive strain state, the middle part of roadway is in tensile strain state, and the J2 distribution of roadway side is ' inverted V ' distribution. With the closer to the working face, the vertex of ' inverted V ' is farther from the roadway, and the vertex value of ' inverted V ' is larger, that is, the greater the damage; the distribution of J3 in the side of the mining roadway is ' V-shaped '. On the positive side, only the coal in the middle of the coal pillar is in compressive strain, and the rest is tensile strain. On the negative side, only the shallow part of the roadway is in tensile strain, and the rest is compressive strain. According to the shape of plastic zone, J2 and J3 distribution, the roof roadway is reinforced and the angle of anchoring hole is adjusted. According to the observation results of surface displacement on site, the optimization of support parameters has a good effect on controlling the deformation of surrounding rock of mining roadway in island working face.

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Section: Characteristics Of Deformation and Damage Of The Peripheral ...mentioning

confidence: 99%

Deformation and failure law and control technology of roadway surrounding rock in island working face based on distribution characteristics of deviatoric stress invariant

Jing,

Wang,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The hot microscopic deformation behaviour of titanium alloys can be divided into three aspects: the heterogeneous deformation (stress and strain distribution caused by the non-uniform deformation mechanism), the microstructure evolution (including texture evolution, dislocation density evolution, dynamic recovery, dynamic recrystallisation and phase transformation) and the damage behaviour (consisting of the void and microcrack evolution). To address the complexity of coupling these three aspects, the crystal plasticity-based simulation framework is an ideal alternative tool for the study of microscopic strain heterogeneity [ 4 ], microstructure evolution [ 5 ] and ductile fracture behaviour [ 6 ]. However, due to the complex deformation mechanisms, microstructure evolution and difficult-to-obtain material model parameters, there has been limited work related to the crystal plasticity modelling of titanium alloys during non-superplastic hot deformation conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysing the Interaction between Microscopic Deformation, Microstructure and Void Evolution of Near-α Titanium Alloys during Non-Superplastic Hot Deformation by an Integrated Crystal Plasticity Finite Element Model

Zhao

Wang

et al. 2021

Materials

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High-efficiency and low-cost hot forming technologies for titanium alloys have been developed for producing complex-shaped, thin-walled tubular components under non-superplastic forming conditions. Under these forming conditions, there exist complex and highly integrated material evolution processes including microscopic heterogeneous deformation, microstructure evolution and damage behaviour. This paper presents an integrated crystal plasticity finite element model of near-α titanium alloys during non-superplastic hot deformation conditions considering grain boundary sliding (GBS), dynamic recrystallisation (DRX), as well as void evolution. The polycrystalline model of a near-α TA15 titanium alloy was established, containing α phase, β phase and grain boundary (GB) regions, in which the GB region was a visualised representation of GBS. The quantitative strength ratio between the GB regions and α phase was calculated according to the Zener–Holloman parameter Z and grain size, which determined the microscopic deformation behaviour. There were found to be two high microscopic strain regions in the α phase: intragranular deformation bands through the most favourable slipping and near the GBs through multiple slipping, which promoted continuous and discontinuous DRX, respectively. With the decrease in parameter Z or grain size, the activated dislocations accommodating GBS were found to no longer pile up inside the grain, but instead travel across the grain interior. Finally, methods to improve the macroscopic plastic formability were proposed for the difficult-to-form titanium alloys experiencing non-superplastic hot deformation.

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A Review on Micro/Nanoforming to Fabricate 3D Metallic Structures

Wang

et al. 2020

Advanced Materials

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With the rapid development of micro‐electromechanical systems (MEMS), micro/nanoscale fabrication of 3D metallic structures with complex structures and multifunctions is becoming more and more important due to the recent trend of product miniaturization. As a promising micromanufacturing approach based on plastic deformation, micro/nanoforming shows the attractive advantages of high productivity, low cost, near‐net‐shape, and excellent mechanical properties, compared with other non‐silicon‐based micromanufacturing technologies. However, micro/nanoforming is far less established due to the so‐called size effects in terms of materials models, process laws, tooling design, etc. The understanding of basic issues on micro/nanoforming is not yet mature, and it is currently a topic of rigorous investigation. Here, a systematic review on the micro/nanoforming processes of 3D structures with multifunctional properties is presented, wherein also a critical examination of the interplay between relevant length scales and size effects affecting the structural integrity of micro/mesoscale metallic systems is also provided. Finally, the challenges of micro/nanoscale fabrication are proposed, including the development trends of new micro/nanoforming processes, multiple field coupling effects, and theoretical modeling at the trans‐scale.

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Interactive effect of stress state and grain size on fracture behaviours of copper in micro-scaled plastic deformation

Cited by 42 publications

References 40 publications

Deformation and failure law and control technology of roadway surrounding rock in island working face based on distribution characteristics of deviatoric stress invariant

Deformation and failure law and control technology of roadway surrounding rock in island working face based on distribution characteristics of deviatoric stress invariant

Analysing the Interaction between Microscopic Deformation, Microstructure and Void Evolution of Near-α Titanium Alloys during Non-Superplastic Hot Deformation by an Integrated Crystal Plasticity Finite Element Model

A Review on Micro/Nanoforming to Fabricate 3D Metallic Structures

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