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

Abstract

In this paper, an attempt is made to describe the structural-statistical aspects of the damage accumulation and fracture of structural steel by means of experimental and numerical micromacromodeling. The new approach of multiscale modeling of structure element fracture based on evolution of microstructure levels is proposed. The lifetime is considered as an ultimate state in a local volume of material, or a critical value of the local damage approaching.

Multiscale modelling of damage and fracture processes in nanomaterials

“…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).…”

“…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].…”

“…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.…”

“…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).…”

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

“…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.…”