The inherent strain method for additive manufacturing: critical analysis and new inherent strain rate method

Abstract To reduce computation time, the inherent strain (IS) method is popular. It consists in adding layers, at room temperature, with an “inherent strain” representing plastic deformation undergone during deposition. An IS developed, including a direct determination of tensor based on transient thermo-elastic-viscoplastic (TEVP) simulation. Validation achieved: taking full-field strains, allows retrieving TEVP predictions. However, application to full part, for which set strains must be conserved all along construction, leads poor results, far from TEVP. As alternative, new rate” (ISR) proposed, consisting linearizing resolutions. Combined on-line learning technique, this strategy results identical reference, still significant speed-up. This makes proposed ISR very promising.