On the relationship between impact energy and delamination area

Viscoelastically prestressed polymeric matrix composites – Effects of test span and fibre volume fraction on Charpy impact characteristics

“…6 shows that the test and control sample data form approximately linear trends at both spans thus indicating some dependence of energy absorption on delamination area. These linear relationships can be compared with findings from impact tests on glass fibre-epoxy plate samples [26]. All test sample data points show higher AV f values than corresponding control results, concurring with the larger delamination regions observed in Fig.…”

Compression-after-impact response of woven fiber-reinforced composites

“…Systematic studies of the interactive effects of these damage processes have been relatively scarce. The CAI performance of composites is also significantly affected by the microstructural configuration [9], the mechanical properties of the constituent materials, particularly the resin [11], stacking sequence [12,13] and specimen thickness [2,14,7].…”

Experimental optimization of the impact energy absorption of epoxy–carbon laminates through controlled delamination

“…In fact, as the interlaminar strength increases the delamination damage is hindered, and the composite laminates tend to fracture in a more brittle way under impact conditions. Hong and Liu [32] showed that there is an almost linear relationship between the impact energy and the total 4 delaminated area in glass/epoxy laminates. As a consequence, an efficient way to improve the energy absorption capacity of laminate composites in the through-thickness direction is by promoting controlled delamination by weakening the interlaminar bond strength or interlaminar fracture toughness [26].…”

“…Moreover, the existence of an optimal value of the interlaminar fracture toughness corresponding to maximum energy absorption has been theoretically proven by Lear and Sankar [37], but not experimentally verified. Delamination, and therefore the energy absorbing capability, of composite laminates has been also successfully promoted by other techniques, such as the introduction of fibre orientation change between adjacent layers [32], the modification the target stiffness [38], or the introduction of ply grouping [39].…”