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Experimental analysis of effects of core joints on axial fatigue of composite sandwich structures

Name
Ivan
Surname
Sergeichev
Scientific organization
Skoltech
Academic degree
PhD
Position
Senior research scientist
Scientific discipline
Mathematics & Mechanics
Topic
Experimental analysis of effects of core joints on axial fatigue of composite sandwich structures
Abstract
In practice, sandwich core sheets are joined with a simple butt-joint before infusion. The intensity of the axial load transferred thru core-to-core joint might influence the performance of the sandwich structure. This research work tends to examine this effect under static and fatigue loading. Finite element analysis was used to validate the specimens’ geometrical configurations. Experimental results for butt-, finger- and scarf-type joints are presented and discussed.
Keywords
PVC, foam, fatigue, core, S-N curve, scarf, junction
Summary

Results obtained are summarized in the following:

  • Results from axial static tensile test did not reveal any significant difference in strength among all joint configurations.
  • In comparison with the traditional butt joint, the scarf joint increased the axial stiffness of the sandwich panel by 16 %.
  • The fatigued specimens featuring the scarf joint outperformed the traditional butt joint and the baseline design (without core joint). Fatigue life with respect to facing stress increased by 6 %.
  • The proposed core finger joint showed a shallower trend line (S-N curve) than the butt and scarf joints, indicating higher relative fatigue performance at high-cycle levels.