Application of Investigating the Impact Damage in Carbon Fiber Composite after Patch Repair by Using Pre-embedded Fiber Bragg Grating Sensors
Date Issued
2010
Date
2010
Author(s)
Cheng, Ping-Chieh
Abstract
Carbon fiber reinforced plastics (CFRP) are used in various fields, due to their high specific strength and modulus. Interior damage in CFRP caused by impact may lead to catastrophic failure of the structure. Patching repair is sometimes employed. It is important to monitor the damage development after repair to make sure that the CFRP structure is reliable and safe. Due to its small size, Fiber Bragg Grating (FBG) sensors can be embedded inside the CFRP materials without significantly affecting its integrity. The purpose of this study was to discuss the feasibility of investigating impact damage development and the effect after composite patch repair (CPR) by using pre-embedded FBG sensor in CFRP material. For the post-impact fatigue test, it was found that the intensity of FBG peak gradually decreased as the fatigue cycles increase. Occasionally, in the highly non-uniform strain filed near the FBG, the disappearance or near vanish of peak was caused by other wavelength intensity increasing. As a whole, variation of intensity of the peak can be used to reflect the damage development. Thus, comparing with result of CPR impact damage before fatigue test, it proves damage development was restrained by use patch repair. It was same result for CPR post-impact fatigue damage before second fatigue test, intensity of peak kept stable. In other words, pre-embedded FBG sensor in CFRP material is able to monitor damage development inside CFRP and to prove CPR can restrain damage development.
Subjects
Fiber Bragg Grating
Carbon Fiber Reinforced Plastics
Impact test
Post-impact fatigue damage
Composite Patch Repair
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R97522531-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):37551d692ab26939372c7f84276e7aec