Modeling of the Damage Accumulation and Fracture: Structural-Statistical Aspects

Lepov, Valeriy; Иванова, А. Д.; Achikasova, Valentina; Lepova, Kiounna

doi:10.4028/www.scientific.net/kem.345-346.809

Cited by 7 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is seen that before the extensive macroscopic plastic deformation the surface relief change and the microcracks is appeared on the 3D-images and profiles. The damaging has been numerically estimated by the methods of multifractal analyses of the scanned images [7]. The calculation of parameters of the multifractal spectrum has been performed for the equal areas (100 × 100 pixels or 580 × 580 nm) in grain boundary zone for the (a) initial state, and for the steps on deformation curve -(b) 1500, and (c) 1650 N (see fig.4).…”

Section: Resultsmentioning

confidence: 99%

“…The multiscale modelling approach has been actively developed last years [1][2][3][4][5][6]. First of all, there are many conferences in material and computer sciences taking place where this problem has been discussed [1,3,7].…”

Section: Introductionmentioning

confidence: 99%

“…First of all, there are many conferences in material and computer sciences taking place where this problem has been discussed [1,3,7]. Some studies have very specific nature like a multiscale modelling of a quantum dot in a semiconductor solid containing a free surface [4], and here the lattice-statics and continuum Green's functions integrated with classical molecular dynamics are used.…”

Section: Introductionmentioning

confidence: 99%

“…Such works analyse the dislocation activity mainly and are restricted by the method on nanoscale only. Some possibility of multiscale approach was shown as realization of structural and statistical approach [6,7]. In general case the multscale evolution modelling approach for the damage nucleation and crack propagation in structural submicrocrystalline materials could be presented (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multiscale modelling of damage and fracture processes in nanomaterials

Lepov¹

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. The common multiscale evolution approach to structural modelling of the damage accumulation and fracture processes of submicrocrystalline materials is considered. The method of scanning probe microscopy has been applied to describe the damage evolution on nanoscale. The small-sized plane deformation specimens have been loaded in the tensile device integrated in the scanning probe microscope. The multifractal analysis has been used for the quantitative characterization of in situ deformation of the surface by means of scaling properties. To reveal the mechanism of low-temperature fracture the atomic-force microscopy has been applied to characterize the surface morphology of the stretching deformations of samples fractured at different temperatures.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multiscale modelling of damage and fracture processes in nanomaterials

Lepov¹

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…For of crack propagation the stochastic model in heterogeneous material was used [4][5]. The model is based on the mechanism of stress induced opening of cracks or pores at small particles or flaws, its viscoplastic growth and coalescence.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Stress-Strain State and Crack Propagation in Welded Samples

Bisong

Sivtsev

Lepov

2017

SSP

Self Cite

View full text Add to dashboard Cite

The numerical analysis of stress-strain state of low-alloyed welded steel samples test has been considered. The mechanical heterogeneity has been estimated by the micro hardness test. The stress-strain state analysis is based on the models of linear elasticity, which are described by Lame equations for displacement. In this case the samples are considered as perfect welded samples without any welding defects. The discretization of the system of equations is done through the finite element method, and the numerical realization of the method is performed on collection of free software FEniCS. The defects influence has been estimated by stochastic modelling of viscous crack growth. The data for crack size in weld and heat affected zone was obtain from microscopic observation, and for mechanical properties from microhardness testing. The result obtained shows that, the distribution of displacement in all samples are almost the same. Between the welded zone, the heat affected zone and the external elliptic zone, the Von Mizes stress is almost the same in all three samples. Concerning the crack growth, the velocity of it propagation in welded zone is higher as much again than that in the heat affected zone. This research is beneficial to welders, modellers of structures, researches as a whole.

show abstract