Computational homogenization of fatigue in additively manufactured microlattice structures
COMPUTATIONAL MECHANICS, cilt.71, sa.2, ss.367-384, 2023 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 71 Sayı: 2
- Basım Tarihi: 2023
- Doi Numarası: 10.1007/s00466-022-02243-1
- Dergi Adı: COMPUTATIONAL MECHANICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Compendex, INSPEC, MathSciNet, zbMATH, Civil Engineering Abstracts
- Sayfa Sayıları: ss.367-384
- Anahtar Kelimeler: 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 Üniversitesi Adresli: Hayır
Özet
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.