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The lattice structure is a periodically repeating three-dimensional open-cell architecture, and the introduction of polymer materials into its gaps results in a lattice structure filled with silicone rubber that can simultaneously exhibit vibration reduction, energy absorption, and other functional characteristics. In this study, the compressive behavior of both the lattice structure and the lattice structure filled with silicone rubber were investigated through a combination of finite element analysis and experimental investigations. The results show that the finite element analysis results are consistent with the experimental ones, and the method can be used to analyze such structures. Lattice structures filled with silicone rubber have better load-bearing capacity compared to lattice structures, and the integration of silicone rubber increases the compressive strength of the lattice structure, reducing the occurrence of structural localization phenomena. [ABSTRACT FROM AUTHOR]

The fracture behavior of rhombic dodecahedron (DOD) and body-centered cubic (BCC) 3D printed lattice structure considering surface roughness was investigated. Tensile tests on flat specimens with different surface roughness were performed, which indicates surface quality has an important influence on the fracture elongation. Smoothed round and round notched tensile specimens were also tested to calibrate damage constitutive model parameters. Based on the statistical data of the diameter variations of the struts and a progressive damage material model, FEM models were built to simulate the fracture behaviors of lattice structures. The simulation results are consistent with the experimental ones and damage evolution characteristics of the fractured struts are discussed. It's proved that surface roughness is a key factor to affect the strength of the lattice structure and fracture behavior. [ABSTRACT FROM AUTHOR]