Elastoplastic deformation of a roughness element

Murashov, Mikhail V.; Kornev, Yu. V.

doi:10.1134/s1063784214030189

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…The size of the deformable sample was significantly larger than the indentation depth (h). The rough surfaces on the upper surface of the deformable samples were generated from the scanning data, and the altitude difference between the rough surfaces and the surrounding smooth surface was 0.5 μm [37]. Figure 1 shows the flow chart outlining the process of creating a representative three-dimensional finite element model with a normalized roughness (S q /R = 1.78 × 10 −3 ).…”

Section: Finite Element Modelingmentioning

confidence: 99%

On determination of elastic modulus and indentation hardness by instrumented spherical indentation: influence of surface roughness and correction method

Peng

Liu

et al. 2023

Mater. Res. Express

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Although, surface roughness can influence the determination of elastic moduli and indentation hardness to some extent by instrumented spherical indentation test, limited work has been done to quantitatively reveal and minimize these influences. In the present work, through a large number of finite element (FE) simulations and analyses, we clarified the evolution trend of determined elastic moduli and indentation hardness corresponding to different normalized indentation depths (h/R) and normalized roughness (Sq/R). On this basis, an area correction method was proposed to improve the measurement accuracy in the elastic moduli and indentation hardness. The FE results show that, with the newly proposed correction method, the maximum relative error in determined elastic moduli is reduced from about ±7% to ±2%, and that in the determined indentation hardness is reduced from about ±13% to ±5%, when Sq/R ≤ 2.2 × 10-3 and h/R = 5%. Applications were then illustrated on four typical metallic materials (i.e., AA 7075, AA 2014, steel 316L, and copper T2). The experimental results demonstrate that the proposed correction method is able to mitigate the effects of surface roughness on the determination of elastic moduli and indentation hardness to obtain more correct results.

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Section: Finite Element Modelingmentioning

confidence: 99%

On determination of elastic modulus and indentation hardness by instrumented spherical indentation: influence of surface roughness and correction method

Peng

Liu

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…To estimate the accuracy of the finite element solution there was performed the comparison of results of a physical upsetting experiment with the results of corresponding numerical modeling. From the upsetting experiment of the cylindrical specimen made of aluminum 1050 UNS A91050 the stress-strain curve was acquired [17]. The experiment was carried out according to ASTM E9 standard.…”

Section: Physical Experimentsmentioning

confidence: 99%

Three-dimensional Finite Element Modelling of the Cylindrical Specimen Upsetting

Murashov

Власов

2018

MATEC Web Conf.

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Friction has a substantial influence on the metal forming at upsetting of cylindrical aluminum specimens. The finite element method is often used to investigate this problem. This paper aims to reveal possible numerical errors and obstacles related to the 3D finite element solution of the problem. The calculation results for the proposed numerical 3D-model are compared with the experimental data. The influence of friction is demonstrated and a good agreement on the tool displacement is obtained. The features of the numerical solution of the problem in the ANSYS finite element software are shown.

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“…While solving the problems we assume lack of initial cold work hardening, residual stresses and influence of indentation size effect [43] considerably strengthening the surface when penetrating to several microns [44]. To obtain general patterns of asperities' behavior at flattening, carrying out calculations within assumptions of continuum mechanics, we accept the sizes of the bodies, the protrusion and the valley to be macro-scale.…”

Section: Introductionmentioning

confidence: 99%

A Condition for Complete Flattening of Asperities in a Rough Contact

Murashov

2018

MATEC Web Conf.

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Considering rough surface profiles in a contact model is of decisive importance. In the up-to-date rough contact models there remained underexplored the opportunity of complete flattening of smaller asperities and therefore the need of using the multilevel roughness models, including fractal ones. If higher level asperities are not flattened completely when pressed, then they will be able to impact on the contact process. This paper considers model problems of elastic-plastic contact with hardening for a body with protrusions and two pyramids as the objects similar to asperities. Modeling results show that asperities are completely flattened only on condition of confined compression. For real contacting rough surfaces under low pressures, complete flattening of asperities will not occur. It is shown that roughness elements on the surface of the asperities do not disappear even at severe deformation of the latter. The reason is a combination of the asperity form and hardening of material, while the consequence is a reduction of the real contact area.

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Elastoplastic deformation of a roughness element

Cited by 8 publications

References 11 publications

On determination of elastic modulus and indentation hardness by instrumented spherical indentation: influence of surface roughness and correction method

On determination of elastic modulus and indentation hardness by instrumented spherical indentation: influence of surface roughness and correction method

Three-dimensional Finite Element Modelling of the Cylindrical Specimen Upsetting

A Condition for Complete Flattening of Asperities in a Rough Contact

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