Interlaminar fracture toughness improvement in composites with hyperbranched polymer modified resin

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

“…When a composite structure is impacted, delamination often occurs, which seriously reduces the load bearing capacity of the laminate especially under compressive loads [5]. Therefore, several methods have been developed to improve the interlaminar strength and interlaminar fracture toughness of composite laminates, such as matrix toughening [6][7][8][9], through-thickness stitching [10][11][12][13][14], Z-pinning [15,16], and interleaving [17][18][19][20][21][22][23][24][25] and short-fibre interlaminar reinforcement [25]. Most of the above mentioned methods have been reviewed by Kim and Mai [26], who also pointed out the key role played by the fibre-matrix interfacial shear strength in determining the interlaminar resistance of composite laminates.…”

Multiscale Polymer Composites: A Review of the Interlaminar Fracture Toughness Improvement

“…Curing kinetics were altered slightly but remained suitable for RTM (Resin Transfer Molding) processing. By adding HBP modifiers, fracture toughness shows an improvement of 130% compared to the pure resin [61]. DeCarli et al [62] proved that epoxy HBP can be used to achieve high toughening in epoxy anhydride composites.…”

Impact response of glass/epoxy laminate interleaved with nanofibrous mats

“…A number of methods to prevent delamination were developed and evaluated over the years. These include matrix-toughening (Ishai, et al, 1978;Verrey et al, 2005), use of braided fabric (Dow & Dexter, 1997), edge cap reinforcement (Howard et al, 1986), through-thickness stitching Jain et al, 1998), and etc. Ductile interleaving seems to be one of the recommended methods, in which interleaf layers of toughened materials were inserted into middle plies of the composites.…”