Akademik Veri Yönetim Sistemi
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY, cilt.42, ss.10510-10536, 2026 (SCI-Expanded, Scopus)
This study was conducted to clarify the combined effects of build
orientation and unit-cell topology on the low-velocity impact response
of selective laser melted AlSi10Mg auxetic lattice structures, since
further comparative experimental evidence under identical design
conditions is still valuable. Re-entrant, arrowhead, star-shaped, and
missing-rib structures fabricated at 0°, 45°, and 90° were tested at
impact energies of 20, 40, and 60 J. The impact response was evaluated
using contact force-time, force-displacement, and energy-time histories,
along with image-processing-based surface damage assessment,
radiographic inspection, and cross-sectional analysis. The absorbed
energy was primarily governed by the applied impact energy, ranging from
18.67 to 19.48 J at 20 J, 38.70–39.88 J at 40 J, and 59.84–61.38 J at
60 J. In contrast, peak contact force and deformation behavior strongly
depended on build orientation and unit-cell geometry. The arrowhead
structure exhibited the highest load-carrying capacity, reaching 19877 N
at 60 J and 0° build orientation, whereas the re-entrant and
missing-rib structures showed higher deformation, with a maximum
displacement of 11.20 mm. Increasing build orientation reduced peak
contact force and promoted a transition from stiffness-dominated to
deformation-controlled behavior. Damage evolved from localized
indentation to progressive cell collapse and distributed internal damage
with increasing impact energy. RSM analysis further confirmed that
impact energy dominated absorbed energy, whereas cell geometry and build
orientation mainly governed peak contact force and deformation
response. The most favorable impact performance was obtained for the
arrowhead geometry fabricated at low build orientation.