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Experimental evidences and numerical modelling of the strength differential effect in additively manufactured 316L steel produced via laser powder bed fusion
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DOI：10.1016/j.mechrescom.2026.104660.png)
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Abstract
En 中文
Despite the significant potential of additive manufacturing (AM) over traditional processes to produce structural 316L steel components, a key challenge is ensuring that the mechanical performance are acceptable and reliable. In this context, performing experimental campaigns revealing their key macroscopic mechanical response, and being able to model their elastoplastic deformation for generalized loadings is essential. In this paper, the mechanical response of AM 316L produced via Laser Powder Bed Fusion (L-PBF) is investigated under uniaxial tension and torsion loadings. First, an inverse FEMU-assisted identification procedure is adopted to identify the material flow curve under the hypothesis of J2 plasticity. Experiments put into evidence the remarkable strength-differential (SD) effect, being the predominant feature of the macroscopic response of AM 316L L-PBF. Next, the isotropic yield function proposed by Cazacu and Barlat in 2004, expressed in terms of both invariants of the deviatoric stress tensor, with a single unknown parameter governing the SD effect, is used to model the observed experimental features. The predictive capability of the modelling strategy is validated by accurately reproducing the material response under tensile and torsional loading. Furthermore, predictions for loading paths not included in the identification procedure, namely uniaxial compression and combined axial-torsion loadings, are presented and discussed.
Keywords:
316L steel
Additive manufacturing
Strength differential effect
Cazacu-Barlat 2004
Journal
M
IF:
2.3
Papers:
115
Citations:
3.9K
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