Investigating the translaminar fracture toughness of 3D printed semi-woven and non-woven continuous carbon fibre composites

Interlaminar and translaminar fracture toughness of 3D‐printed continuous fiber reinforced composites: A review and prospect

“…For 3D-printed CFRCs, research in terms of translaminar fracture toughness focused on the mode I translaminar fracture toughness. According to the ASTM D5045 Translaminar ASTM D5045 [47,48] ASTM E1922-04 [49] ASTM STP 410 [50] Mode II Interlaminar ASTM D7905 [24,37,40,51] ISO 15114 [39,40,42] Mixed mode Interlaminar ASTM D6671 [40] standard, the compact tension (CT) was used to characterize mode I fracture toughness. 47 In addition, testing of semi-circular Bending (SCB) specimens and double edge notch tension (DET) specimens could also be applied to characterize mode I fracture toughness in 3D-printed continuous fiber reinforced specimens.…”

“…According to the ASTM D5045 Translaminar ASTM D5045 [47,48] ASTM E1922-04 [49] ASTM STP 410 [50] Mode II Interlaminar ASTM D7905 [24,37,40,51] ISO 15114 [39,40,42] Mixed mode Interlaminar ASTM D6671 [40] standard, the compact tension (CT) was used to characterize mode I fracture toughness. 47 In addition, testing of semi-circular Bending (SCB) specimens and double edge notch tension (DET) specimens could also be applied to characterize mode I fracture toughness in 3D-printed continuous fiber reinforced specimens. 50,54 Besides, according to ASTM E1922-04, Zhang et al 49 conducted the uniaxial tensile tests of single-edge notched plates to characterize the translaminar fracture toughness of 3D-printed CFRCs.…”

“…In this study, Onyx and continuous glass fibers (glued by polyamide), supplied by Markforged, F I G U R E 1 0 Configurations of (A) double edge notch tension specimens, 50 (B) single-edge notched specimens, 49 and (C) compact tension specimens. 47 F I G U R E 1 1 The fracture surface of (A) semi-woven (left) and cross-ply (right) CT specimens 47 and (B) DCB specimens with fiber bridging. 43 F I G U R E 1 2 (A) Internal hierarchy of interfaces in woodpecker's beak, (B) 3D-printed DCB specimens with different A/λ ratios, (C) comparison of printing direction for specimens, (D) fracture energy ratio of specimens with different A/λ ratios, and (E) fracture energy ratio of specimens printed in different directions.…”

“…Configurations of (A) double edge notch tension specimens, 50 (B) single‐edge notched specimens, 49 and (C) compact tension specimens 47 …”

“…The 3D‐printed semi‐woven architecture not only compacted unidirectional pre‐impregnated continuous fiber but also showed much higher energy absorption and load‐bearing capacity than those for cross‐ply lay‐up CFRCs 61 . Huang et al 47 evaluated translaminar fracture toughnesses of 3D‐printed cross‐ply and semi‐woven specimens by compact tension (CT) test specimens, as shown in Figure 10 (c). For all samples, continuous carbon fibers (glued by polyamide), supplied by Markforged, were applied in specimen production.…”