Constitutive and damage modelling of selective laser melted Ti-6Al-4V lattice structure subjected to low cycle fatigue

Based on low cycle fatigue (LCF) experiment data of SLM Ti-6Al-4V, a comprehensive finite element model of the combined isotropic and kinematic hardening and continuous damage for SLM Ti-6Al-4V is established. The simulation results of the stress-strain hysteresis loop and the LCF life are in good agreement with the experiment results under different strain amplitude levels. Based on the reliable achieved model of SLM Ti-6Al-4 V, the finite element model of the Gyroid and Diamond lattice structure is established for LCF analysis. It is found that the Diamond lattice structure has higher LCF resistance.

Automated summary

A comprehensive finite element model of isotropic and kinematic hardening is established for SLM Ti-6Al-4V based on low cycle fatigue experiment data, showing that the Diamond lattice structure has higher LCF resistance.