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1. Additive manufacturing (AM) produces components with complex geometries, but internal defects cannot be eliminated absolutely in the LPBF metal, which reduces the fatigue properties of the material.

2. The crack initiation and early growth for very-high-cycle fatigue (VHCF) is significantly different from that for low-cycle fatigue (LCF) and high-cycle fatigue (HCF), and VHCF cracks usually initiate at the internal or subsurface of the material.

3. The crystal plasticity finite element model (CPFEM) simulation is widely used to investigate fracture damage of metallic materials with considering the effects of microstructure and anisotropy, and the cohesive zone model (CZM) is introduced to describe interface contact and friction behavior during cyclic loading.

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