THE FRACTURED-BASED MODELING OF PULL-OUT PROBLEM WITH LONG EMBEDDED NYLON 600
ABSTRACT: Fracture phenomenon
happened during the pull-out process. Previous study of short embedded nylon
600 in cementitious matrix model has proved several new theories with main
concern of fracture. Nevertheless, it is necessary to assure that the same
theories can be applied accurately and consistently in the pull-out problem
with long embedded nylon 600. The research
conducts experiment method
and analytical method.
The experiment method
applies pull-out test
with long embedded nylon
600 in cementitious
matrix and the
analytical method is
based on previous
fractured based pull-out model. The
pull-out specimens have
embedded length of
lf = 110-180
mm. The results
of experiment show
that all specimens suffer
fibers broken. The
pull-out process explains
several stages: (a)
Pre-slip stage, (b)
Slip stage, and
(c) Strain-hardening stage. The pre-slip loads are found as 400-430 N
and pre-slip displacements of no more than 0.1 mm. The slip
loads have been
observed in the
same range of
pre-slip loads with
displacements of 3-30
mm. The maximum strain-hardening loads
are found as
1600-1800N while the
broken loads are
observed as 1400-1700
N. The maximum displacements are
ranged about 100-200 mm. The previous model for pull-out problem with short
embedded nylon 600 is applied to the
long embedded nylon
600. Clearly, the
model has been
proven fit to
the experimental results.
It is emphasized that
the theories for
the pull-out problem
with short embedded
nylon 600 are
still accurate and
consistent applied to long embedded nylon 600. This research meets conclusions: (a) The same theories of
pull-out problem with short
embedded nylon 600
in cementitious matrix
can be applied
accurately and consistently
for long embedded
nylon 600, (b) The unstable and stable fracture process phenomenon exist
during the pull-out process, (c) Several stages exist during the
pull-out process, (d)
The equation of
stable crack length
of previous model
can also be
applied for long embedded nylon 600, (e) The equation of load of previous model can also
be applied for long embedded nylon 600, (f) The
possibility of crack
arrester presence is
bigger for the
long embedded fiber
length than the
short ones, thus
the strain-hardening part in load-displacement curve is longer for the
long embedded fiber length.
Author: Rr. M.I. Retno
Susilorini
Journal Code: jptsipilgg090008
