Fatigue Damage Accumulation In CFRP
Author(s)
A. Plumtree & K. Cain
Abstract
A cyclic bending study using a stress ratio of 0.1 was conducted on
unidirectional 45oCFRP with a 60% nominal fibre volume fraction. This allowed
the continuous matrix damage evolution to be followed without the influence of
delamination. Damage was monitored by changes in the fatigue modulus,
increase in crack density and amount of permanent bending. It was found that
their effects were complementary and that, in general, damage evolved in the
same way as that observed in unidirectional tension-tension cyclic tests. All three
monitoring techniques showed that damage accumulation was cycle dependent.
Damage may be divided into two main stages, with rapid growth at the onset of
cycling to about 10-20% life (Stage I), after which the damage increases slowly,
but steadily, to failure (Stage II).
Keywords: CFRP, polymer matrix composites, fatigue damage accumulation,
cyclic bending, two stage damage.
1 Introduction
Fatigue damage in polymer matrix composites occurs in several forms including
matrix cracking, fibre fracture and buckling, debonding at the matrix/fibre
interface and delamination between plies. Initial cracking occurs preferentially in
the relatively weak matrix. Since there are many stress concentration sites in the
matrix adjacent to the fibres, matrix damage is a process of initiation and gradual
coalescence. Because of continual crack initiation and propagation, matrix
cracking is regarded as progressive damage, as opposed to non progressive
damage of the fibres.
Keywords
CFRP, polymer matrix composites, fatigue damage accumulation,
cyclic bending, two stage damage.
Related Book
Other papers in this volume
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