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Article Dans Une Revue Advanced Engineering Materials Année : 2020

Surface defects sensitivity during the unfolding of corrugated struts made by powder-bed Additive Manufacturing

Résumé

Corrugated struts as part of lattice structures can lead to novel mechanical behavior by a combination of material and geometrical hardening. The unfolding behavior of such struts offers a potential of large macroscopic straining. However, their ability to be unfolded is impacted by the surface characteristics inherited from the additive manufacturing process. This study evaluates the unfolding sensitivity to these surface characteristics. Corrugated struts with varying surface roughness have been produced using a combination of Electron Beam Powder-Bed Fusion to produce corrugated samples with different nominal diameters, and chemical etching assisted by micro-CT to achieve a given final diameter. In-situ micro-CT tensile tests have been carried out to track the evolution of the struts morphology under loading. Surface defects play a significant role in the unfolding ability of such struts. They are characterized either by a global roughness or by a local notch depth. A quite broad unfolding dispersion remains for samples with the same level of roughness. A finer description of notch depth and location within the gauge length allows a more accurate prediction of the unfolding ability. A model for predicting the probability of failure during unfolding is presented.
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Dates et versions

hal-03021833 , version 1 (24-11-2020)

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Mathieu Suard, Emeric Plancher, Guilhem Martin, Rémy Dendievel, Pierre Lhuissier. Surface defects sensitivity during the unfolding of corrugated struts made by powder-bed Additive Manufacturing. Advanced Engineering Materials, 2020, ⟨10.1002/adem.202000315⟩. ⟨hal-03021833⟩
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