Numerical model for predicting fatigue life under conditions of initial surface roughness of nickel alloy obtained by additive technological processes

Ryzhkov P.V., Gorbovets M.A.
UDC
669.018.44:669.245
DOI
10.18577/2307-6046-2026-0-3-183-202
Article PDF (Russian) (1.53 MB)
How to cite
Ryzhkov P.V., Gorbovets M.A. Numerical model for predicting fatigue life under conditions of initial surface roughness of nickel alloy obtained by additive technological processes // Proceedings of VIAM. 2026. No. 3. DOI: 10.18577/2307-6046-2026-0-3-183-202. URL: https://test.viam.ru/en/journal/2026/3/14
Keywords
material fatigue, nickel alloy VZh159 SLS, additive manufacturing, surface roughness, numerical modeling, Smith–Watson–Topper (SWT) parameter, Paris’ law, finite element method, microcracks, damage model
Abstract

A numerical fatigue damage model for the nickel-based alloy VZh159 SLS was developed, accounting stochastic surface roughness and implementing a two-stage approach. The predicted fatigue life at Δε = 0.5 % and an elliptical crack with a ratio a/b = 2 was 7,725 cycles (–19 % error) compared to the experiment; at Δε = 0.4 % and a/b = 1: 23,043 cycles (–8 % error). A method for generating surface topography based on the spectral attenuation of periodic functions is proposed.

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