PSI - Issue 53

S. Leonardi et al. / Procedia Structural Integrity 53 (2024) 327–337 S. Leonardi et al. / Structural Integrity Procedia 00 (2023) 000–000

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5. Conclusion

In this work, the topological defects induced by LPBF additive manufacturing were investigated onto metallic cellular architectures containing random pore features. These architectures were first designed numerically using a random sequential absorption algorithm and then fabricated by LPBF using two di ff erent metallic powders. Using a custom-made image analysis program, we quantified the geometrical mismatch between the as-designed, i.e. defect free , numerical models and the as-manufactured, i.e. imperfect, test samples. Topological descriptors extracted from image post-processing were then used to construct FE models of the experimental test samples, whose e ff ective elastic moduli were computed by means of computational homogenization. The size of the manufactured pores was found to be greatly a ff ected by the LPBF-process parameters, and notably by the number of contours. The resulting porosity can thus deviate significantly from its nominal value if these parameters are not properly studied and optimized. Col lectively, the results of this study highlight the potential o ff ered by metallic cellular architectures containing random pore features. The latter prove less sensitive to topological defects than periodic cellular latticed fabricated by the same additive manufacturing process.

6. Acknowledgments

We would like to thank Dr. Zahra Hoosmand and Prof. K. Danas (LMS, Ecole Polytechnique) for providing help with running and debugging the computer generation algorithm. M.G. Tarantino also acknowledges financial support from both the CNRS Cellule Energie and the Graduate School Chemistry of Universite´ Paris-Saclay.

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