Mode I and II interlaminar fracture toughness of glass/carbon inter‐ply hybrid FRP composites: Effects of stacking sequence and testing temperature

Abstract

Even though laminated FRP composites show exceptional performance in various modes of loading, they are susceptible to delamination. The ambient temperature and elevated temperature delamination resistance of glass/carbon fiber interply hybrid composites were assessed via mode I and mode II interlaminar fracture toughness tests performed at 30, 50 and 70 C. Interply hybrid composites performed better than composites with single type of fiber. The fracture toughness of inter-ply hybrid composites varied with the stacking position. At 30 C, mode I fracture toughness value of alternative glass and carbon fiber stacking sequence (G 1 C 1 ) 5 of hybrid composite showed 40% improvement over 10 layered carbon/epoxy (C 10 ) composite. Further, Mode II fracture toughness of C 5 G 5 composite showed 22% enhancement, and C 10 exhibited 42% improvement over 10-layered glass/epoxy composite. Increasing the test temperature of all composites improved their G IC and G IIC values. The increment in the mode I fracture toughness properties of all composite was in the range of 5%-23% at 70 C from its room temperature value. The fractographic images of fractured samples were studied under a scanning electron microscope and failure mechanisms of composites were identified. K E Y W O R D Shigh temperature durability, inter-ply hybrid composite, mode I ILFT, mode II ILFT, stacking sequence of glass and carbon fibers

Investigations on toughening and self‐healing performance of plain woven composites with mendable polymer stitches

“…According to the basic principles of fracture mechanics, there were three types of fracture modes under different loading states, which were opening crack, in-plane shear crack and out-plane shear crack. [34][35][36][37] In particular, in terms of model-I interlaminar fracture toughness, the DCB experiment was a commonly method, and it can effectively disclose the interfacial properties of the composites. Therefore, the DCB test was employed to evaluate the toughening and healing effects of EMAA stitched specimen in this paper.…”

A Review of Delamination Damage of Composite Materials

“…Furthermore, the partial fracture toughness in composites of unidirectional layers significantly depends on the difference in the directions of stacking of adjacent layers [107,108] and on the thickness of the layer [109,110], i.e., they are constants of the composite.…”