Micro- and mesomechanical aspects of deformation-induced surface roughening in polycrystalline titanium

Романова, В. А.; Балохонов, Р. Р.; Панин, А. В.; Kazachenok, Marina; Kozelskaya, Anna

doi:10.1016/j.msea.2017.05.029

Cited by 38 publications

(25 citation statements)

References 46 publications

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“…Model parameters and loading conditions were chosen to provide close agreement of quasistatic and dynamic solutions. Shear strain rate ()   being in inverse proportion to the relaxation time was shown to mainly control the material strain rate sensitivity [18]. Calculations for varied loading velocities have shown that the dynamic and static solutions are in a reasonable agreement provided that ()   is approximately ten times as large as the total strain rate.…”

Section: Finite Element Implementationmentioning

confidence: 97%

A Numerical Study of the Microscale Plastic Strain Localization in Friction Stir Weld Zones

et al. 2018

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A crystal plasticity approach was used to study the effects of grain shape and texture on the deformation behavior of friction stir weld (FSW) microregions. The explicit stress-strain analysis was performed for two representative grain structures with equiaxed and extended grains. Grain orientations were assigned to simulate no texture or a weak or strong cubic texture. Calculations have shown that the texture gave rise to earlier plastic strain localization on a larger scale. The highest stresses were found to develop in a non-textured specimen with equiaxed grains where the grain boundaries served as a barrier to dislocation motion. In both equiaxed and extended grain structures with a strong cubic texture no pronounced strain localization was seen on the grain scale but mesoscale shear bands appeared early in the deformation process. The calculations have shown that the microstructure-based simulation is a reasonable tool to study the deformation behavior of FSW materials, which is difficult to be predicted within macroscopic models alone.

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Section: Finite Element Implementationmentioning

confidence: 97%

A Numerical Study of the Microscale Plastic Strain Localization in Friction Stir Weld Zones

et al. 2018

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“…In order to model and determine changes in roughness of the initially smooth surface subjected to stamp loading, analogous to the experiment, FSI (Fluid Structure Interaction) numerical analyzes were performed using the ABAQUS system (ver. [6][7][8][9][10][11][12][13][14]. FSI (fluid-structure interaction) analysis allowed taking into account the oil layer on the steel surface of the sample.…”

Section: Numerical Simulation and Calculations Of Surface Roughnessmentioning

confidence: 99%

“…Romanova and her team have carried out a series of works on titanium research in recent years (2016-2020) [12][13][14][15]. This articles addresses the problem of multiscale surface roughening in titanium subjected to uniaxial tension.…”

Section: Introductionmentioning

confidence: 99%

“…The basal texture was shown to significantly affect the plastic strain localization and roughness patterns. In [14,15] the three-dimensional numerical analysis was performed of the deformation-induced roughening in polycrystalline specimens with and without surface-hardened layers. Threedimensional microstructure-based constitutive models are developed, using crystal plasticity, and employed in finite element calculations of uniaxial tension.…”

Section: Introductionmentioning

confidence: 99%

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Deformation-Induced Roughening by Contact Compression in the Presence of Oils with Different Viscosity: Experiment and Numerical Simulation

2020

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The aim of the work is to show both the similarities and differences in the formation of deformation-induced roughness in contact compression in the presence of oil and the problem of free surface roughing during uniaxial stretching in a plastic area. The relationships between changes in the roughness are caused by the deformation of the sample and the viscosity of oil at the contact area. It has been shown that normal contact loading with the presence of oil initially leads to an increase in surface roughness, then to its smoothening. The results of the experimental research have been compared with numerical simulation made using FSI (Fluid Structure Interaction) and ABAQUS systems. Using finite element calculations, it was possible to explain the phenomenon of roughness formation on the surface of a smooth steel sample. The changes in the structure of the smooth surface resulting from compression in the presence of oil are caused by the rotation and deformation of surface grains. The roughness of this structure is dependent on the viscosity of oil: the more viscous the liquid is, the rougher texture is formed.

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“…The circular dimples of tearing were formed on areas of structural heterogeneity, in particular, in the vicinity of inclusions and on boundaries between grains, which was accompanied by the accumulation of local strains and the fracture of the material. The consolidation of dimples is primarily due to the transition to a volumetric stressed state, which causes the growth and coalescence of defects with the formation of large dimples [25][26][27].…”

Section: Static Stretchingmentioning

confidence: 99%

Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys

Konovalenko

Maruschak

Prentkovskis

2018

Metals

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An automated method for analyzing the shape and size of dimples of ductile tearing formed during static and impact fracture of titanium alloys VT23 and VT23M is proposed. The method is based on the analysis of the image topology. The method contains the operations of smoothing the initial fractographic image; its convolution with a filter to identify the topological ridges; thresholding with subsequent skeletonization to identify boundaries between dimples; clustering to isolate the connected areas that represent the sought objects-dimples. For each dimple, the following quantitative characteristics were calculated: area, coefficient of roundness and visual depth in units of image intensity. The surface of ductile tearing was studied by analyzing the peculiarities of parameter distribution of the found dimples. The proposed method is applied to fractograms of fracture surfaces of titanium alloys VT23 and VT23M.

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Micro- and mesomechanical aspects of deformation-induced surface roughening in polycrystalline titanium

Cited by 38 publications

References 46 publications

A Numerical Study of the Microscale Plastic Strain Localization in Friction Stir Weld Zones

A Numerical Study of the Microscale Plastic Strain Localization in Friction Stir Weld Zones

Deformation-Induced Roughening by Contact Compression in the Presence of Oils with Different Viscosity: Experiment and Numerical Simulation

Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys

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