Figure 4 - uploaded by Kadir Bilisik
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(a) Delamination growth failure in CSU; (b) crack failure in CTU; (c) delamination failure in CSU-N (optical microscope, magnification x6.7).
Contexts in source publication
Context 1
... length rough crack propagation was identified in the filling as a form of filament/filament splitting in the filling direction. Both structures had a sharp crack tip in the declamination front (Figure 4(a-b)). Beam arms failure at the declamination front of stitched/ nano (CS-TS-N) structures was identified. ...
Context 2
... declamination growth was observed parallel to the mid-plane warp near to the mid-plane of the base (CSU and CTU) structures (Figure 3(a-c)). However, minor rough crack growth was observed in the filling and probably extended in the filling direction. Both the base and base/nano structures had a sharp crack tip. Long smooth crack propagation was achieved near to the mid-plane of the stitched/nano (CS-TS-N) composites in the warp directions. Short length rough crack propagation was identified in the filling as a form of filament/filament splitting in the filling direction. Both structures had a sharp crack tip in the declamination front (Figure 4(a-b)). Beam arms failure at the declamination front of stitched/ nano (CS-TS-N) structures was identified. Under fracture toughness load, declamination crack growth was arrested by the fiber bridging of the nanostitching yarns in the out-of-plane direction. When the nanostitching yarn strength was well above the top layer structure strength, "beam arms failure" occurred in the top layer which was to some extent related to the bending strength ( Figure 5(a)). Most of the warps next to the interlocking loops of the paraaramid nanostitching yarn were simultaneously broken in the width direction of the structure (CS-TS-N) ( Figure 5(b)). ...
