TY - JOUR
T1 - Improving interlaminar fracture toughness and impact performance of carbon fiber/epoxy laminated composite by using thermoplastic fibers
AU - Chen, Ling
AU - Wu, Li-Wei
AU - Jiang, Qian
AU - Tian, Da
AU - Zhong, Zhili
AU - Wang, Yan
AU - Fu, Hong-Jun
PY - 2019/9/16
Y1 - 2019/9/16
N2 - The effects of thermoplastic polyimide (PI) and polypropylene (PP) fibers and areal density of toughened layer on interlaminar fracture toughness and impact performance of carbon fiber/epoxy (CF/EP) laminated composites were studied. Mode I interlaminar fracture toughness (GIC) was analyzed via double cantilever beam (DCB) tests. When comparing for the toughener type, PI played a positive role in enhancing the mode-I fracture toughness, while PP was not effective due to the less fiber bridge formed during composite curing. The toughening effects of areal density of PI were further investigated by end notched flexure (ENF) testing and low velocity impact testing to better understand the toughening mechanisms. The results revealed that the toughening effect reached its best effectiveness when the areal density of toughened layer was 30 g/m2. Compared with the control group, GIC and GIIC of CF/EP laminated composite were increased by 98.49% and 84.07%, and Fmax and Ee were enhanced by 92.38% and 299.08% under low velocity impact. There is no obvious delamination phenomenon on the surface of laminates after low velocity impact, indicating the improved interlaminar and impact performance of laminated composite.
AB - The effects of thermoplastic polyimide (PI) and polypropylene (PP) fibers and areal density of toughened layer on interlaminar fracture toughness and impact performance of carbon fiber/epoxy (CF/EP) laminated composites were studied. Mode I interlaminar fracture toughness (GIC) was analyzed via double cantilever beam (DCB) tests. When comparing for the toughener type, PI played a positive role in enhancing the mode-I fracture toughness, while PP was not effective due to the less fiber bridge formed during composite curing. The toughening effects of areal density of PI were further investigated by end notched flexure (ENF) testing and low velocity impact testing to better understand the toughening mechanisms. The results revealed that the toughening effect reached its best effectiveness when the areal density of toughened layer was 30 g/m2. Compared with the control group, GIC and GIIC of CF/EP laminated composite were increased by 98.49% and 84.07%, and Fmax and Ee were enhanced by 92.38% and 299.08% under low velocity impact. There is no obvious delamination phenomenon on the surface of laminates after low velocity impact, indicating the improved interlaminar and impact performance of laminated composite.
KW - Carbon fiber
KW - Impact performance
KW - Interlaminar fracture toughness
KW - Laminated composite
KW - Thermoplastic polyimide
UR - http://www.scopus.com/inward/record.url?scp=85072301702&partnerID=8YFLogxK
U2 - 10.3390/molecules24183367
DO - 10.3390/molecules24183367
M3 - Article
C2 - 31527461
AN - SCOPUS:85072301702
SN - 1420-3049
VL - 24
JO - Molecules
JF - Molecules
IS - 18
M1 - 3367
ER -