MIXED MODES INTERLAMINAR FRACTURE TOUGHNESS OF CFRP LAMINATES TOUGHENED WITH CNF INTERLAYER
In the present paper, the influence of carbon nanofiber on interlaminerfracture toughness of CFRP is investigated using MMB (Mixed Mode Bending) tests. Vapor grown carbon fiber VGCF and VGCF-S, and multi-wall carbon nanotube MWNT-7 have been employed as the toughener of the interlayer on the CFRP laminates. In order to evaluate the fracture toughness and mixed mode ratio of it, double cantilever beam (DCB) tests, end notched fracture (ENF) tests and mixed mode bending (MMB) tests have been carried out. Boundary element analyses were applied to the CFRP model to compute the interlaminar fracture toughness, where extrapolation method was used to determine the fracture toughness and mixed mode ratio. The interlaminar fracture toughness and mixed mode ratio can be extrapolated by stress distribution at the vicinity of the crack tip of the CFRP laminate. It was found that the interlaminar fracture toughness of the CFRP laminates was improved by inserting the interlayer made of carbon nanofiber especially in the region where shear mode deformation is dominant.
CFRP laminate fracture toughness boundary element method mmb test cnf interlayer
Masahiro Arai Tatsuya Sasaki Satoshi Hirota Hiroaki Ito Ning Hu Marino Quaresimin
Shinshu University, 4-17-1, Wakasato, Nagano-shi, Nagano., 380-8553, Japan Graduate Schiool of hinshu University, 4-17-1, Wakasato, Nagano-shi, Nagano., 380-8553, Japan Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba-shi, Chiba, 263-8522, Japan University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy
国际会议
南京
英文
91-94
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）