PSI - Issue 37

Yifan Li et al. / Procedia Structural Integrity 37 (2022) 49–56 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 8. Comparison of the experimental and numerical load – displacement curves for different orientations lattices.

4. Conclusion The fracture properties of octet-truss lattices in different orientations have been investigated experimentally and numerically in this research. The fracture resistances of printed photopolymer lattices in orientations X, Y and Z are 5.72, 8.52 and 8.49MPa √ mm, respectively. Lattice orientation has significant effects on the crack paths. For orientations X and Z specimens, the crack paths are horizontal to the initial crack, and the crack of orientation-Y specimens deviates from the direction of the initial crack with the angle of 30°. The simulation results using beam elements have good agreement with the experimental results both in terms of the mechanical responses and crack propagate patterns in all three orientations. References ASTM D638-14, 2015. Standard test method for tensile properties of plastics. Standard. ASTM International. West Conshohocken, PA. ASTM E399-17, 2017. Standard test method for linear-elastic plane-strain fracture toughness KIc of metallic materials. Standard. ASTM International. West Conshohocken, PA. Banhart, J., 2001. Manufacture, characterisation and application of cellular metals and metal foams. Progress in materials science 46(6), 559-632. Deshpande, V. S., Ashby, M. F., Fleck, N. A., 2001. Foam topology: bending versus stretching dominated architectures. Acta materialia 49(6), 1035-1040. Gu, H., Pavier, M., Shterenlikht, A., 2018. Experimental study of modulus, strength and toughness of 2D triangular lattices. International Journal of Solids and Structures 152, 207-216. Gu, H., Shterenlikht, A., Pavier, M., 2019. Brittle fracture of three-dimensional lattice structure. Engineering Fracture Mechanics 219, 106598.