Numerical Investigation on the Effect of Residual Stresses on the Effective Mechanical Properties of 3D-Printed TPMS Lattices

The layer-by-layer process of additive manufacturing (AM) is known to give rise high thermal gradients in the built body resulting accumulation residual stresses. In current study, a numerical investigation conducted on effect stresses mechanical properties IN718 triply periodic minimal surface (TPMS) lattices fabricated using selective laser melting (SLM) for different relative densities. AM simulation four sheet- and ligament-based TPMS topologies, namely, Schwarz Primitive, Schoen Gyroid, IWP-S, IWP-L, are performed sequentially coupled thermomechanical finite element model evaluate histories stress evolution throughout SLM process. results utilized obtain effective properties, such as elastic modulus, yield strength, specific energy absorption (SEA), while accounting field arising from correlated density Gibson–Ashby power laws reveal that modulus as-built samples can be significant, especially Primitive Schoen-IWP-L when compared without However, less significant strength SEA samples. work demonstrates methodology simulations quantify influence inherited complex topologies.