PSI - Issue 32

A.S. Shalimov et al. / Procedia Structural Integrity 32 (2021) 230–237 Shalimov A.S., Tashkinov M.A. / Structural Integrity Procedia 00 (2019) 000–000

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3. Results Several model samples of nanoporous gold RVEs with different porous phase volume fractions and material models were analyzed. Fig. 3a demonstrates the tensile stress field of a bicontinuous structure with elastic properties of the matrix and porous volume fraction p=0.680. Fig. 3b shows the stress field of the structure with the same morphology, but elastoplastic properties. It can be noted that the thinnest ligaments act as stress concentrators. This means that with any damage model considered, the ligaments are the weakest zones of the structure, where most likely failure processes will initiate.

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Fig. 3. Von Mises stress fields for bicontinuous structure with inclusion volume fraction p=0.680 under a tensile load of u=5 nm, having (a) elastic properties of the matrix; (b) elastoplastic properties of the matrix.

Figure 4a shows the tensile stress field for bicontinuous structure with elastoplastic properties of the matrix and damage model with degradation procedure, with an inclusion volume fraction p=0.680. The damage field for the same structure is presented on Figure 4b.

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Fig. 4. Tensile (u=5 nm) loading for bicontinuous structure with inclusion volume fraction p=0.680 having elastoplastic matrix properties with the procedure of degradation of elastic properties (a) von Mises stress field; (b) damage field. A similar picture, but for the structure with the porous volume fraction p=0.696, can be observed in Figures 5 and