Semi-analytical modelling of buckling driven delamination in uniaxially compressed damaged plates

Post-buckling behaviour and delamination growth characteristics of delaminated composite plates

“…5a shows that, initially, the upper less stiff sublaminate mainly experiences out-of-plane deflection (local response), whereas the lower more stiff sublaminate slightly deflects in the opposite direction. Thus, the delaminated composite plate exhibits an opening-mode buckling response [11,33]. Once the global buckling response is triggered, the thicker more stiff sublaminate pulls the upper sublaminate into the negative direction.…”

“…For these plates, delamination growth is associated with the onset of the global buckling response. Post-buckling responses for a plate being supported on all edges and containing an embedded delamination can be found in [9,10,30,33], however only [30] considers a non-rectangular delamination shape in the form of an ellipse. In an experimental study [8], such an elliptical delamination shape was observed following impact scenarios.…”

Geometric modelling of kink banding in laminated structures

“…However, as described above, a similar pattern remains with the strength reducing and the band widths increasing for weaker properties in shear, which appears to be entirely logical. The detailed effects of crack propagation have been left for future work although recent work on buckling-driven delamination [25] has suggested that an analytical treatment of such effects may indeed be tractable. Figure 15: Comparison of the response of the kink band formation for different α C values in (a), (c) and (e) for the range of α C = 0.69 • → 0.96 • and initial G 12 values from 6.03 kN/mm 2 → 8.45 kN/mm 2 (in (b), (d) and (f).…”

Nonlinear failure mechanisms of laminated composites

“…Work done from dilation U D and shearing U S can thus be evaluate. Additional features from the original model include strain energies from bending U b and direct compression U m , and the work done from the external load P ∆ can be incorporated without significant alterations, leading to the total potential energy of the system: A previously derived delamination model [3,5] is investigated further for delaminations of size a = b = 20mm. Essentially, the behaviour is very similar to the original case of a = b = 15mm since thin-film buckling also leads to stable delamination growth (Fig.…”