Woven fabrics, characterized with the
special structure form, are widely used as reinforcement of textile composites
in structural applications by far. Roving cloth, as
one of the woven fabrics, is characterized with the cross section of the warp
fiber bundles and weft fiber bundles, which are usually used as reinforcement
for laminate molding. GFRP (glass fiber reinforced plastic) materials,
characterized by high strength, low cost, low density, corrosion resistance,
are also adopted in the form of glass woven fabric as reinforcements.
Generally, final
fracture of composites is considered to be caused by the accumulation of these
microcracks or fractures. Thus, initial fracture, which represents the
initiation of micro fracture, is considered to be significant in determining
the fracture mechanism.
In this paper,
investigation on the initial fracture behavior was carried out on roving glass
woven fabric reinforced composites which were manufactured by hand
lay-up method. Two kinds of roving glass woven fabrics of different FAW (Fabric
Area Weight) and crimp ratio, Type A of 570 g/m2 and Type B of
800 g/m2, were adopted as reinforcement. Tensile test was conducted
and tensile properties were discussed on specimens of 6 degrees
0°/5°/10°/80°/85°/90°. The initial fracture behavior was observed on 0 degree
and 90 degree and the fracture mechanism was compared and discussed among
5°/10°/80°/85°.
The results showed
that Type B had higher tensile modulus and tensile strength than that of Type
A. And different initial fracture behaviors between two kinds of materials was
observed and analyzed, which indicated that the crimp ratio played an important
role of woven fabric reinforced composites in fracture mechanism. After
the tensile test, models of the woven fabric were built according to the
geometric dimension of the fabric for 0 degree and 90 degree, then the initial
fracture and interfacial strength was simulated by the software Marc. By
combining the experimental results and finite element analysis, initial
behavior of fracture progress in roving glass woven fabric reinforced composite
materials was discussed and predicted.
In future work, 3D models in multiscale are supposed to be built and
further simulation of two different crack modes are also planned to be carried
out.
Article by Zhilan
Xu and Atsushi Yokoyama, from Kyoto Institute of Technology, Kyoto, Japan.
Full access: http://mrw.so/4G9ByY
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