TY - JOUR
T1 - Static strength and fatigue life of pinned hybrid titanium-composite single-lap-shear joints
AU - Kralovec, Christoph
AU - Dengg, Andreas
AU - Schagerl, Martin
AU - Schiller, Arne
AU - Bisagni, Chiara
AU - Loebbecke, Miriam
AU - Haubrich, Jan
AU - Hanelt, Robert
PY - 2025
Y1 - 2025
N2 - Modern aircraft structures consist of a multi-material mix, dominated by high-performance composites, but also including metal alloys, e.g., for load introduction parts. This experimental research investigates the static and fatigue strength of pinned hybrid titanium-composite single-lap-shear joints. The Ti6Al4V adherend is manufactured by laser powder bed fusion. The joining is done by co-curing with the carbon fiber reinforced polymer adherend. The static tests focus on damage initiation and ultimate load, and are benchmarked by identical joints without pins. The fatigue tests focus on damage initiation and propagation. Digital image correlation is used for damage monitoring. Results show, (i) a high ratio of static ultimate failure to damage initiation load, (ii) early low-cycle damage initiation but then long high-cycle fatigue life until failure, and (iii) the crack stopping effect of the interlocking pins. Furthermore, visual joint failure analysis reveals a variety of damage modes, suggesting comprehensive testing and proper pin design.
AB - Modern aircraft structures consist of a multi-material mix, dominated by high-performance composites, but also including metal alloys, e.g., for load introduction parts. This experimental research investigates the static and fatigue strength of pinned hybrid titanium-composite single-lap-shear joints. The Ti6Al4V adherend is manufactured by laser powder bed fusion. The joining is done by co-curing with the carbon fiber reinforced polymer adherend. The static tests focus on damage initiation and ultimate load, and are benchmarked by identical joints without pins. The fatigue tests focus on damage initiation and propagation. Digital image correlation is used for damage monitoring. Results show, (i) a high ratio of static ultimate failure to damage initiation load, (ii) early low-cycle damage initiation but then long high-cycle fatigue life until failure, and (iii) the crack stopping effect of the interlocking pins. Furthermore, visual joint failure analysis reveals a variety of damage modes, suggesting comprehensive testing and proper pin design.
KW - Digital image correlation
KW - Fatigue strength
KW - Laser powder bed fusion
KW - Pinned hybrid titanium-CFRP joint
KW - Static strength
UR - http://www.scopus.com/inward/record.url?scp=85211479773&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2024.118765
DO - 10.1016/j.compstruct.2024.118765
M3 - Article
AN - SCOPUS:85211479773
SN - 0263-8223
VL - 354
JO - Composite Structures
JF - Composite Structures
M1 - 118765
ER -