Stability of the face layer of sandwich beams with sub-interface damage in the foam core

Compression strength of sandwich panels with sub-interface damage in the foam core

“…the dent growth and non-linear deformation in the face cause a marginal decrease in the panel stiffness. This disagrees with observations for sandwich beams of the same configurations [22]. This is obvious because for the panels the progressive dent growth does not occur at the whole specimen width and is not accompanied by the overall bending, that occurs in this case in the beam specimens.…”

“…The present paper extends the previous work by the authors [20][21][22] on the local buckling in sandwich panels containing a sub-interface damage in the foam core, which locally reduces support for faces. The focus is laid on the core crush damage accompanied by a permanent residual dent in the face sheet, while the laminate itself is considered undamaged.…”

Damage Tolerance of Naval Sandwich Panels

“…In [24] a configuration having a more ductile core was used leading to an impact as in Fig.7a, i.e., without any core cavity. The failure mode of such configurations is characterized by stable dent growth followed by a more buckling type unstable dent growth.…”

“…The residual strength prediction models of foam core sandwich beams with impact damage used in [21][22][23][24] are all based on detailed descriptions of the crushed core zone, both in terms of geometry and the properties of the crushed core material. The crushed core properties were obtained from experiments where the core was pre-crushed in compression, allowed to relax and then tested in tension, compression and shear in various directions [22].…”

Unequal Faces Effect on Fracture of Composite Sandwich Beam with Flexible Core

“…They assumed core compression in fully backed state. Many researchers considered damage of sandwich beam using SPCT [3][4][5][6][7][8][9]. They compared faces stresses with corresponding strengths for prediction of face fracture.…”