Issue 78

V. I. Kolesikov et alii, Fracture and Structural Integrity, 78 (2026) 220-232; DOI: 10.3221/IGF-ESIS.78.13

40CrNiMo/Cu/40CrNiMo, Cu/40CrNiMo/Cu, and 40CrNiMo/40CrNiMo/40CrNiMo RVEs

Cu Cu

40CrNiMo 40CrNiMo 40CrNiMo 40CrNiMo

1.3

〈P 11 ⟩/〈P 33 ⟩

0.9

0.5

〈ε 11 ⟩

0.1

5.E-11

5.E-08

5.E-05

5.E-02

Figure 9: The volume-averaged effective shear-to-normal stress ratio response/coefficient of the materials in studied RVEs of soft/hard and hard/hard composites under combined shear/normal loading. The color coding corresponds to one in RVE names above the graph. Finally, Fig. 9 compares the volume-averaged effective shear-to-normal stress ratio response/coefficient 〈 11 〉 〈 33 ⁄ 〉 of the materials in the studied RVEs under combined shear/normal loading. Note that the stress ratio is not a real friction coefficient. At low strain, it reflects elastic stick (but not friction). In addition, the 〈 33 〉 is always negative, while 〈 11 〉 can be positive or negative (reverse shear) depending on local stick-slip. For 40CrNiMo phase in soft/hard composite RVEs, the response is almost constant (mostly elastic), while in the RVE of hard/hard composite “40CrNiMo/40CrNiMo/40CrNiMo” it also demonstrates a drop in the plastic deformation regime at intermediate strains (reverse shear / partial slip) followed by a fast rise due to the fast work-hardening process. In the case of the Cu phase, this response rises at a slower rate during initial plastic deformation; then it levels off at intermediate strains and rises much faster in the hardening regime at high strains. For all RVEs, the columnar microstructure exhibits generally higher effective shear-to-normal stress ratio response in interfacial contact. C ONCLUSIONS he feasibility of crystal plasticity (CP) simulations with the DAMASK package for studying various interfacial contacts has been demonstrated, yielding rich information on the resulting mechanical fields. This represents the primary scientific-methodological novelty of this research. Three-dimensional and two-dimensional maps of vM σ values, along with plots of vM σ 〈 〉 vs vM ε 〈 〉 , made it possible to identify regions of potential damage initiation and characterize the general plastic response of components within mating contact pairs. The latter was established as a function of material mechanical properties and microstructure. Effective shear-to-normal stress ratio plots of 11 33 / P P 〈 〉 〈 〉 vs vM ε 〈 〉 have revealed fine details of the material mechanical response under complex loading conditions. Further applications of these CP simulations are envisioned for a wide range of materials and more complex interfacial systems. A CKNOWLEDGMENTS he study was funded by the grant from the Russian Science Foundation (project No. 21-79-30007-P, https://rscf.ru/en/project/21-79-30007/). T

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