Response of an aluminium Schwarz triply periodic minimal surface lattice structure under constant amplitude and random fatigue

This paper presents an investigation about fatigue behaviour of an aluminium triply periodic minimal surface lattice structures, printed with Selective Laser Melting. Aim of the paper is to experimentally characterize constant and variable amplitude fatigue strength and to assess if current methodologies for predicting random fatigue strength of solid materials can be extended also to lattice structures, in a homogenized setting. The investigation is complemented by a detailed analysis of samples fracture surface, corroborated by numerical analyses, and a comprehensive discussion on the evolution of the damage observed in the experiments. •Fatigue strength of a TPMS lattice structure manufactures in AlSi10Mg by L-PBF.•Constant amplitude fatigue characterization at different stress ratios.•Random fatigue characterization at different RMS levels.•Detailed characterization of the failure mechanisms.•Fatigue life under variable amplitude well predicted by the Miner’s rule.