Trade News
Composite materials for plastic optical fiber 2015.05.26
 Structural health monitoring (SHM) composites have become a rapidly developing research technology for intelligent development and monitoring of various emerging applications of materials. The elastomer material has a relatively high elasticity which needs effective monitoring of the high strain behavior.. Such elastomer composites have a strong special case, the most obvious one is solid rocket motor (SRM) propellant material (missile).. Solid rocket motor propulsion system is considered as the most critical in missile system as its power and predetermined characteristics. A key issue for effective economic management of missile inventory, thus for the effective use and the efficient SHM of the high energy propellant for the reliability of these solid missiles.

In SRM many different sources of failure is possible, such as off sticky particles from the insulation or case (axisymmetric and local) and in the holes of the longitudinal crack (radial), or in the hole to crack (Jing Xianggu). All of these cases may adversely affect the missile's execution of its mission or may even result in the ignition or catastrophic failure of the motor during operation. This work presents a continuous monitoring type of polymer optical fiber as a safe feature for use in such materials systems better solution due to its anti electromagnetic interference, intrinsic electrical and explosive.

Polymer fiber, supplemented with special primer, has excellent properties for bonding of propellant material embedded in solid rocket motor. In addition, it was demonstrated that in practice POF was successfully cast and cured with a high rate of breakage of the propellant process and quartz fiber. PMMA plastic optical fiber as the jacket cable or unjacketed bare fiber, successfully embedded into the solid propellant material and subsequent mechanical load special tensile test equipment.

The process is operated with a simple optical setup of a high awareness of the linear regime of 1 MW power LED at 650nm and a photodetector. The use of special plastic primer coatings shows excellent bonding between the fiber and the propellant allows for effective strain transfer from the energetic material and preventing relative slippage. Two different configurations of the fiber are used, along with the axial specimen and other embedded fiber loop longitudinal integrated fibers. The strain transfer part of the specimen is applied in the axial straight fiber section and it also allows the geometric deformation of the nested loop from the circular to the elliptical shape. This deformation results in the local bending radius of the circular fiber induced thereby to change the additional bending loss. The inherent elasticity of plastic optical fiber and the loss of large curvature of the origin in the strain capacity strain provides higher than 10% monitoring. In addition, plastic deformation of the plastic strains in high strain is presented as important data / event recorder for recording the stress-strain history of the propellant.