Damage-induced failure analysis of additively manufactured lattice materials under uniaxial and multiaxial tension

Mechanical behavior of additively manufactured lattice materials has been mainly investigated under uniaxial compression, while their performance under uniaxial and multiaxial tension are yet to be understood. To address this gap, a generic elastoplastic homogenization scheme with continuum damage model is developed, and three different lattice materials, namely cubic, modified face-center cubic and body-center cubic, are analyzed under uniaxial, biaxial and triaxial tension. The influence of micro-architecture on the material's failure behavior as well as its macroscopic mechanical performance is thoroughly discussed. For validation, a set of uniaxial tensile experiments are conducted on functionally graded cubic lattice samples that are additively manufactured using Electron Beam Melting (EBM) process. Digital image correlation technique is employed to obtain the macroscopic stress-strain curves, and manufacturing imperfections are inspected using light omitting microscopy. It turns out that the behavior of as-built samples could substantially differ from numerical predictions. Thus, a defect-informed numerical model is employed to accommodate the effect of imperfections. The outcome is in a very good agreement with experimental data, indicating that with proper input data, the developed scheme can accurately predict the mechanical and failure behavior of a given lattice material.

Bengtsson, RhodelUppsala universitet,Tillämpad mekanik(Swepub:uu)rhobe375 (author)
Botero, CarlosMittuniversitetet,Institutionen för kvalitets- och maskinteknik,Sports Tech Research Centre,Mid Sweden Univ, Sports Tech Res Ctr, Dept Qual Technol & Mech Engn, Akad Gatan 1, S-83125 Östersund, Sweden.(Swepub:miun)carbot (author)
Rännar, Lars-Erik,1973-Mittuniversitetet,Institutionen för kvalitets- och maskinteknik,Sports Tech Research Centre,Mid Sweden Univ, Sports Tech Res Ctr, Dept Qual Technol & Mech Engn, Akad Gatan 1, S-83125 Östersund, Sweden.(Swepub:miun)larran (author)
Mousavi, Mahmoud,1983-Uppsala universitet,Tillämpad mekanik(Swepub:uu)seymo168 (author)
Uppsala universitetTillämpad mekanik (creator_code:org_t)

In:International Journal of Solids and Structures: Elsevier2520020-76831879-2146

By the author/editor: Molavitabrizi, D ...; Bengtsson, Rhode ...; Botero, Carlos; Rännar, Lars-Eri ...; Mousavi, Mahmoud ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Composite Scienc ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Applied Mechanic ...

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