PSI - Issue 38

Christophe Grosjean et al. / Procedia Structural Integrity 38 (2022) 94–108 C.Grosjean and al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Fig. 16. Failure area B under 30-495 bars load

9. Conclusion/perspectives This study demonstrated the possibility of producing almost identical hydraulic components by three different processes. This makes it possible to consider different production solutions for other parts, depending on the size of the series considered, economic issues and other functional criteria, each with its own advantages and limitations. Static and dynamic tests carried out confirm the suitability of the alloy for use in severe configurations with high pressure levels, particularly with the laser melting process on a powder bed. To improve the fatigue life, local geometrical modifications as well as work on the roughness, using specific surface finishing, would further increase the performance achieved. The methodology used in fatigue calculation give a good correlation with test results; this methodology could be used to validate the topology optimization of the parts; the failure areas have been identified. Correlation is achieved using roughness measurement, residual stress evaluation and an adjustment of the modelisation regarding a metrology of the real part. A particular caution must be considered for the fatigue calculation because without these parameters, the hierarchy of failure won’t be the same. Acknowledgement We thank Eric Baustert (VOLUM-e) and Charles de Forges (Spartacus3D) for their contributions to the design and production of the L-PBF parts. CETIM would like to thank all the industrial companies who participate to the CETIM collective research program (PTT-FA) on metal additive manufacturing dealing with many other use-cases. References

[1] Terry Wohlers, Ian Campbell, Olaf Diegel, Ray Huff, Joseph Kowen, Wohlers Report 2020: 3D Printing and Additive Manufacturing State of the Industry, Wohlers Associates, 2020

[2] NF EN ISO/ASTM 52900 (2017), Additive manufacturing - General principles - Terminology