The effect of stitching on FRP cylindrical shells under axial compression

Progressive crushing of stitched glass/polyester composite cylindrical shells

“…The predictions of this model are well matched with experimental results reported by Reddy and Reid [16]. Similarly several models describing energy absorbing capacity of cylindrical metallic tubes [17,18] and composite tubes [9,[19][20][21][22] have been developed.…”

“…We have found in our earlier work [9] that circumferential mode I delamination occurs in the middle of the thickness of axially collapsed shell, and absorbs considerable amount of energy. Threedimensional reinforcement i.e., placement of fibres in the thickness direction can improve the G Ic of cylindrical wall.…”

Improvements in Mode I interlaminar fracture toughness and in-plane mechanical properties of stitched glass/polyester composites

“…The effect of stitching on progressive crushing of FRP shells under axial compression has been analyzed by us earlier [11]. It is observed that even though stitching improves the delamination strength because of the high crack closure force exerted by the stitches, the in-plane mechanical properties are degraded.…”

Effect of fracture toughness properties on the crushing of flat composite plates

“…Therefore, when the crack propagates under crushing, the fronds retain a low radius of curvature. Research on evaluating the effect of increasing the Mode-I properties by increasing the resin toughness and/or stitching showed that the absorbed energy in composite tubes increased with increasing Mode-I properties [23,24]. However only these two toughening modes were observed to improve the absorbed energy: other methods such as interleaving and rubber toughening unsaturated polyester resins actually reduced the SSCS despite increasing the Mode-I properties [24].…”