Examination of reliability of fibre optic sensors embedded in carbon/epoxy composites

摘要: One of the most important tasks in achieving a reliable performance embedded optical fiber sensors aircraft health monitoring and usage systems is to clarify their function reliability. In this study limit sensor addressed for number loading conditions at room temperature. For static tensile strain EFPI- was approximately 0.20%, whereas Bragg grating above level (0.4 - 0.5%) initiation matrix cracking laminate. compression EFPI-sensor unimpaired which about four times larger than that tension. constant amplitude fatigue similar loading, i.e. 0.20% 105 cycles. The silica glass/polyimide coating interface identified as sites where failure initiated. finite element analysis showed effects curing stresses moisture laminates have significant influence on reliability sensors. stress concentrations caused by cavity are main reason lower obtained sensors.© (1996) COPYRIGHT SPIE--The International Society Optical Engineering. Downloading abstract permitted personal use only.