Computational homogenization of fatigue in additively manufactured microlattice structures

Mozafari F., Temizer I.

COMPUTATIONAL MECHANICS, vol.71, no.2, pp.367-384, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 71 Issue: 2
  • Publication Date: 2023
  • Doi Number: 10.1007/s00466-022-02243-1
  • Journal Name: COMPUTATIONAL MECHANICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Compendex, INSPEC, MathSciNet, zbMATH, Civil Engineering Abstracts
  • Page Numbers: pp.367-384
  • Keywords: Micromechanics, Additive manufacturing, Microlattice, Microplasticity, Fatigue, COMPRESSION FATIGUE, CONSTITUTIVE-EQUATIONS, MECHANICAL-BEHAVIOR, CRACK INITIATION, LOW-CYCLE, TI-6AL-4V, DESIGN, MODEL, LIFE, MICROSTRUCTURE
  • Abdullah Gül University Affiliated: No

Abstract

A novel computational approach to predicting fatigue crack initiation life in additively manufactured microlattice structures is proposed based on a recently developed microplasticity-based constitutive theory. The key idea is to use the concept of (micro)plastic dissipation as the driving factor to model fatigue degradation in additively manufactured metallic microlattice. An ad-hoc curve-fitting procedure is proposed to calibrate the introduced material constitutive parameters efficiently. The well-calibrated model is employed to obtain fatigue life predictions for microlattices through a diverse set of RVE-based finite element fatigue simulations. The model's predictive capabilities are verified by comparing the simulation results with experimental fatigue data reported in the literature. The overall approach constitutes a unified setting for fatigue life prediction of additively manufactured microlattice structures ranging from low- to high-cycle regimes. It is also shown that the model can be applied to technologically relevant microlattices with mathematically-created complex microstructure topologies.