While Electron Beam Melting is used to produce near net shape parts, it is still important to study geometrical defects since the final parts may include a serious change of geometry or considerable distortions, and thus cannot match the desired geometry even after machining. For example, overhang geometries are very challenging to manufacture, because of the defects they present, such as warping, side loss, raised edges, etc. The objective of the present paper is to identify relations between the typical geometrical defects found in parts that include overhang volumes, especially side loss and warping defects. The originality of this study lies in the manufacture of a large number of Ti-6Al-4V parts in order to carry out a statistical analysis of the results. Correlations are studied between the characteristic parameters of the defects and as a function of the manufacturing conditions. In addition, a principal component analysis is proposed to identify families of defects (modes). Finally, future prospects are discussed for designing parts with the aim of improving geometric quality and for simulating defects.< Réduire

Mots clés en anglais

Additive manufacturing

Electron Beam Melting

Principal Component Analysis

Geometrical defects

Overhang geometry

Statistical analysis

URI

https://oskar-bordeaux.fr/handle/20.500.12278/157591

DOI

http://dx.doi.org/10.1007/s00170-022-10040-6

Project ANR

Maîtrise géométrique des pièces produites par fabrication additive métallique - ANR-17-CE10-0004

Unités de recherche

Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295

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Geometrical defect analysis of overhang geometry produced by electron beam melting: experimental and statistical investigations

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Mots clés en anglais

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DOI

Project ANR

Unités de recherche