A plate model for compressive strength prediction of delaminated composites

Abstract

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Face Damage Growth of Sandwich Composites under Compressive Loading: Experiments, Analytical and Finite Element Modeling

“…From the compressive static test of the [( 45 C ) 2 ,(90 C ,90 G ) 4 ,( 45 C ) 2 ] specimen, the buckled surface coming out of plane was of elliptic shape ( Figure 15 b). Propagation, which was predicted by the mathematical model [ 40 ] to occur at 6130 μstrain, was observed in the experiment at a nominal strain of approximately 5820 μstrain. Unstable propagation leading to failure did not occur until a nominal strain of 6880 μstrain.…”

An efficient numerical approach to the prediction of laminate tolerance to Barely Visible Impact Damage

“…In previous research, near-surface delaminations were found to be critical for in CAI strength reduction [15,22]. Single delaminations near to surface appeared to be more severe in comparison to multiple delaminations at the interior of laminate.…”

“…wherein E is the Young modulus of the material, G c is the interface fracture energy release rate, τ 0 is the maximum interfacial strength (see Table 2), and M is a model parameter which was proposed by Rice [50] It has been demonstrated that delamination size, depth location, predominat orientation, number of delaminated interfaces, as well as specimen dimensions, boundary conditions and stacking sequence affect CAI behaviour which is eventually dominated by the mechanisms of local sublaminate buckling and global laminate buckling [22,25,26,51]. It was also found that the ratio of delamination width to laminate width has a significant effect on these buckling modes [52].…”

“…Aslan et al [21] reported that delamination at interfaces near the laminate surface resulted in the highest reductions of the CAI strength. In fact, it has been proposed that a single circular delamination near the surface dominates the CAI response [22]. Minak et al [23] discussed in detail the effects of intra-ply matrix cracking, and its interaction with interface delamination propagation, on the CAI response of thick and thin laminates.…”

“…A substantial number of researchers have studied multiple BVID configurations and developed analytical and semi-analytical CAI strength reduction models [1,14,15,18,22,[24][25][26][27] based on one or more through-thickness delaminations of idealized shapes. Judging by one of the recent works [22], besides their readiness and efficiency, such models can be accurate to within 30-40% error bounds.…”