As common materials or engineering materials, thermoplastic resin based materials can be used not only directly
fabricating products but also FRTP(fiber reinforced thermoplastic polymer) materials for other uses. As one kind of
FRTP material, GFRPP(glass fiber reinforced polypropylene) has lots of merits, such as: light weight, high strength, high
tenacity, high elongation percentage, good durability, reshaping character and no environmental pollution characters.
And they also can be conveniently formed hoop rebar in civil engineering. While a new kind of GFRPP-OFBG smart rod
which combined GFRPP and OFBG together can be used as not only structure materials but also sensing materials.
Meanwhile, PP packaged OFBG strain sensor can be expected for its low modulus, good sensitivity and good durability.
Furthermore, it can be used for large strain measuring.
In this paper, we have successfully fabricated a new kind of GFRPP-OFBG(Glass Fiber Reinforced
Polypropylene-Optic Fiber Bragg Grating) rod by our own thermoplastic pultrusion production line and a new kind of
PP packaged OFBG strain sensor by extruding techniques. And we monitored the inner strain and temperature changes
with tow OFBG simultaneously of the fabricating process.
The results show that: OFBG can truly reflect the strain and temperature changes in both the GFRPP rod and the PP
packaged OFBG, these are very useful to modify our processing parameters. And we also find that because of the
shrinkage of PP, this new kind of PP packaged OFBG have -13000με storage, and the strain sensing performance is still
very well, so which can be used for large strain measuring. Besides these, GFRPP-OFBG smart rod has good sensing
performance in strain sensing just like that of FRSP-OFBG rod, the strain sensitivity coefficient is about1.19pm/με.
Besides these, the surface of GFRPP-OFBG rods can be handled just as steel bars and also can be bended and reshaped.
These are all very useful and very important for the use of FRP materials in civil engineering structures.