Fracture behavior of polyetherimide (PEI) and interlaminar fracture of CF/PEI laminates at elevated temperatures
Kim, Ki-Young, Ye, Lin, & Yan, Cheng (2005) Fracture behavior of polyetherimide (PEI) and interlaminar fracture of CF/PEI laminates at elevated temperatures. Polymer Composites, 26(1), pp. 20-28.
To investigate the effects of environmental temperature
on fracture behavior of a polyetherimide (PEI) thermoplastic polymer and its carbon fiber (CF/PEI) composite,experimental and numerical studies were performed on compact tension (CT) and double cantilever beam (DCB) specimens under mode-I loading. The numerical analyses were based on 2-D large deformation finite element
analyses (FEA). Elevated temperatures greatly released
the crack tip triaxiality (constraint) and promoted matrix
deformation due to low yield strength and enhanced
ductility of the PEI matrix, which resulted in the greater
plane-strain fracture toughness of the bulk PEI polymer
and the interlaminar fracture toughness of its composite
during delamination propagation with increasing temperature.Furthermore, the high triaxiality was developed
around the delamination front tip in the DCB specimen,
which accounted for the poor translation of matrix
toughness to the interlaminar fracture toughness by
suppressing the matrix deformation and reducing the
plastic energy dissipated in the plastic zone. Especially,
at delamination initiation, the weakened fiber/matrix adhesion at elevated temperatures led to premature failure
of fiber/matrix interface, suppressing matrix deformation
and preventing the full utilization of matrix toughness.
Consequently, low interlaminar fracture toughness
was obtained at elevated temperatures.
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|Item Type:||Journal Article|
|Keywords:||composites, fracture, Polyetherimide|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Engineering Systems
|Copyright Owner:||Copyright 2005 John Wiley and Sons|
|Copyright Statement:||The definite version is available on publication at www3.interscience.wiley.com|
|Deposited On:||17 Mar 2009 14:57|
|Last Modified:||29 Feb 2012 23:22|
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