Durability under fatigue loading of optical fibres applied to fibre reinforced plastic composites

Israel Herszberg; Michael K. Bannister; Henry C. H. Li; Ben Qi; Jane Marsden

doi:10.1117/12.738395

2 July 2007 Durability under fatigue loading of optical fibres applied to fibre reinforced plastic composites

Israel Herszberg, Michael K. Bannister, Henry C. H. Li, Ben Qi, Jane Marsden

Proceedings Volume 6619, Third European Workshop on Optical Fibre Sensors; 661912 (2007) https://doi.org/10.1117/12.738395
Event: Third European Workshop on Optical Fibre Sensors, 2007, Napoli, Italy

Abstract

This paper summarises ongoing research conducted at the Cooperative Research Centre for Advanced Composite Structures (CRC-ACS) on the durability to fatigue loading of optical fibre sensors, which were surface mounted or embedded in fibre reinforced plastic composites. The objective of the research is to quantify the parameters affecting the fatigue performance of such optical fibres. Signal degradation of surface mounted and embedded Bragg grating sensors has been studied for a number of configurations. For some configurations, preliminary results indicate significant signal degradation on tension loaded optical fibres after 50,000 cycles strained to 4000 &mgr;&Vegr; and this degradation has been linked with fibre cracking. No such cracking was observed in compression loaded optical fibres. The durability of the bonding at various interfaces of the optical fibre / composite system has been investigated for various polyimide coated fibres. After one million cycles to 3000 &mgr;&Vegr;, 150 &mgr;m diameter optical fibres exhibited significant disbonding in the coating / cladding interface of the optical fibre. Special 52 &mgr;m diameter optical fibres also exhibited significant disbonding but to a lesser degree than that in the larger fibres. Stripped fibres exhibited no disbonding at the optical fibre to composite interface.

Citation Download Citation

Israel Herszberg, Michael K. Bannister, Henry C. H. Li, Ben Qi, and Jane Marsden "Durability under fatigue loading of optical fibres applied to fibre reinforced plastic composites", Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 661912 (2 July 2007); https://doi.org/10.1117/12.738395

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