Vol.3, No 13, 2003 pp. 739-744
UDC 539.388.2
MICROSCOPIC OBSERVATION OF FIBER DEFORMATION
AND FRACTURE DURING MACHINING OF A-FRP
Eitoku Nakanishi, Yutaka Sawaki, Kiyoshi Isogimi
Department of Mechanical Engineering, Faculty of Engineering, Mie University
Kamihama 1515, Tsu. 514-8507, Japan
E-mail: isogami@mach.mie-u.ac.jp
We observed the deformation and fractural phenomena of Aramid fiber during
machining of A-FRP by microscopically. We can make deformation and fracture
of fiber clear that is situated in the matrix in transmittal. When the
fiber angle ? is 45 degree, Aramid fibers are strongly pressed and expanded
widely towards the cutting direction and peel off under the machined surface
during a cutting tool passes. After the tool passed, a deformed fiber remains
as a fluff. Further, we simulated the phenomena with a very simple model
to evaluate the deformation of fiber during machining. It is based on S.P.
Timoshenko's theory of beams on elastic foundation. In our analysis, the
modulus of the foundation is varied to prove the orientation of fiber.
The calculated results have some coincides with experimental results.
MIKROSKOPSKO POSMATRANJE DEFORMACIJE I
LOMA VLAKNA TOKOM MAŠINSKE OBRADE A-FRP
Mikroskopski smo posmatrali pojave deformacije i loma Aramid vlakna tokom
mašinske obrade A-FRP. Jasna je ona deformacija i lom vlakna koja je smeštena
u matricu u prenosu. Kada je ugao vlakna 45 stepeni, Aramid vlakna su snažno
pritisnuta i široko rastegnuta u smeru sečenja, i ljušte se pod mašinskom
površinom prilikom prelaska alatke za sečenje. Nakon prolaska alatke, deformisano
vlakno postaje paperjasto. Pored toga, simulirali smo pojave pomoću veoma
jednostavnog modela da bismo procenili deformaciju vlakna tokom mašinske
obrade. On je zasnovan na S.P. Timosenkovoj teoriji poluga na elastičnom
postolju. U našoj analizi, modul postolja menja se da bi se dokazalo usmerenje
vlakana. Izračunati rezultati se u nekim slučajevima podudaraju sa sa eksperimentalnim
rezultatima.
