Issue 75

N. S. Kondratev et alii, Fracture and Structural Integrity, 75 (2026) 373-389; DOI: 10.3221/IGF-ESIS.75.27

(a)

(b)

0   . (b)

  vs.

0.01   ,

0.03   ,

0.05   . (a)

Figure 11: Sensitivity analysis at the relative ranges of parameter perturbations

tw d  .

  vs

C ONCLUSION

O

wn experimental results and relevant literature data have been used for the analysis of physical mechanisms in the deformation of SLM-fabricated 316L stainless-steel samples. Based on the observed microstructure, crystal texture and measured properties of distinct structural elements, a two-level constitutive model has been developed. This model accounts for elastic viscoplastic deformation, and it includes statistical averaging over a representative polycrystal set for better accuracy. Then the model is used for calculation the basic mechanical characteristics of inelastic deformation (Young's modulus and yield stresses at different tolerances) of a representative volume of the samples. The following conclusions are drawn. (i) The revealed results are qualitatively consistent with the data of tensile experiments displayed by the elastic and plastic parts of the deformation curve within 96 percent of accuracy. (ii) Following the performed analysis, a higher sensitivity of the constitutive model response to the mean grain size rather than to the magnitude of residual stresses is confirmed. The stability of the developed two-level constitutive model regarding perturbations of the lattice resistance parameters and mean distance between twins is proved established. Thus, the developed statistical constitutive model for describing the behavior of the AISI 316L SS samples can serve as a basis for the development of an effective parametric model. The latter has good prospects for rapid computer simulation of various boundary–value problems of industrial relevance.

A CKNOWLEDGEMENTS

Peter V. Trusov – consultation Kirill V. Ostapovich – texture analysis Anton Yu. Yants – software implementation of the direct model Nikolay V. Kostenkov – TEM investigations Yulia O. Kuzminova – mechanical testing of samples

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