| Summary: | 碩士 === 國立交通大學 === 土木工程學系 === 98 === Carbon fiber are used in various fields due to their light weight, high specific strength and specific elasticity. Carbon fiber srtuctures are brittle materials. There are no significant plastic deformations before destruction. In order to make them reliable and safe, the most important is the ability to instantly monitor the occurrence of damage and development. At present, there are less methods to be able immediately monitor the carbon fiber bicycle while the carbon fiber bicycle are in used. This study suggests that combined use of fiber optical time domain reflectometry for non-destructive testing methods to real-time health monitoring of fatigue damage in carbon fiber bike and internal defects.
Optical fiber has a small diameter, is unaffected by electro-magnetic interference and is reasonably temperature resistant. It can be embedded in the carbon fiber composite material and we could use OTDR(Optical Time Domain Reflection) to detect the characteristics of the loss of internal defects.
This research is about how to embed optical fiber in carbon fiber specimen with carbon fiber tube and the process to develop the carbon fiber bicycle embedded
optical fiber which help healthy monitor the carbon fiber bicycle.In the laboratory, we did the experiment about V-type, U-type bending test and the three-point bending tests, which used OTDR to detect bending loss, and then discuss the relations about the light loss and carbon fiber defects further.
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