Monitoring of hygrothermal ageing effects in an epoxy resin using FBG sensor: A methodological study

2009 ◽  
Vol 69 (3-4) ◽  
pp. 507-514 ◽  
Author(s):  
D. Karalekas ◽  
J. Cugnoni ◽  
J. Botsis
Keyword(s):  
Epoxy Resin ◽  
Methodological Study ◽  
Fbg Sensor ◽  
Ageing Effects ◽  
Hygrothermal Ageing

Effects of hygrothermal and thermal-oxidative ageing on the open-hole properties of T800/high-temperature epoxy resin composites with different hole shapes

2019 ◽  
Vol 32 (3) ◽  
pp. 306-315 ◽  
Author(s):  
Liang Xu ◽  
Yi He ◽  
Shaohua Ma ◽  
Li Hui
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Epoxy Resin ◽  
Failure Modes ◽  
Resin Composites ◽  
Physical Ageing ◽  
Hygrothermal Ageing ◽  
Open Hole ◽  
Epoxy Resin Composites ◽  
Oxidative Ageing

T800/high-temperature epoxy resin composites with different hole shapes were subjected to hygrothermal ageing and thermal-oxidative ageing, and the effects of these different ageing methods on the open-hole properties of the composites were investigated, including analyses of the mass changes, surface topography changes (before and after ageing), fracture morphologies, open-hole compressive performance, dynamic mechanical properties and infrared spectrum. The results showed that only physical ageing occurred under hygrothermal ageing (70°C and 85% relative humidity), and the equilibrium moisture absorption rate was only approximately 0.72%. In contrast, under thermal-oxidative ageing at 190°C, both physical ageing and chemical ageing occurred. After ageing, the open-hole compressive strength of the composite laminates with different hole shapes decreased significantly, but the open-hole compressive strength after thermal-oxidative ageing was greater than that after hygrothermal ageing. Among the aged and unaged laminates, the laminates with round holes exhibited the largest open-hole compressive strength, followed by those with the elliptical holes, square holes and diamond holes. The failure modes of the laminates were all through-hole failures. The unaged samples had a glass transition temperature ( T g) of 226°C, whereas the T g of the samples after hygrothermal ageing was 208°C, which is 18°C less than that of the unaged samples, and the T g of the samples after thermal-oxidative ageing was 253°C, which is 27°C greater than that of the unaged samples.

Swelling of DGEBA/DDA epoxy resin during hygrothermal ageing

Polymer ◽  
1998 ◽  
Vol 39 (14) ◽  
pp. 3253-3260 ◽  
Author(s):  
G.Z. Xiao ◽  
M.E.R. Shanahan
Keyword(s):  
Epoxy Resin ◽  
Hygrothermal Ageing

Hygrothermal ageing effects on the static fatigue of glass/epoxy composites

Composites ◽  
1993 ◽  
Vol 24 (7) ◽  
pp. 547-555 ◽  
Author(s):  
A. Chateauminois ◽  
B. Chabert ◽  
J.P. Soulier ◽  
L. Vincent
Keyword(s):  
Epoxy Composites ◽  
Static Fatigue ◽  
Ageing Effects ◽  
Hygrothermal Ageing

Research on Fiber Bragg Grating Sensing Technique for Cable Tension Monitoring of Suspension Bridges

2013 ◽  
Vol 368-370 ◽  
pp. 1391-1395 ◽  
Author(s):  
Xing Jun Lv ◽  
Xue Feng Zhao ◽  
Long Wang ◽  
Hao Dong ◽  
Yan Feng Zhu
Keyword(s):  
Epoxy Resin ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Suspension Bridges ◽  
Sensing Element ◽  
Long Distance ◽  
Cable Tension ◽  
Fbg Sensor ◽  
On Line

In order to realize long-distance, long-term and on-line cable tension monitoring of suspension bridges, a novel sensor has been designed based on Fiber Bragg Grating (FBG) sensing technique, which comprises of fixtures of the sensor as well as FBG, micro-spring and epoxy resin made large gauge sensing element. Further, following the calibration test for the designed FBG sensor, research on the calibrated sensor for monitoring the cable tension was carried out, whose result shows that, featured by the simplicity of operation and the accurate monitoring data, the designed FBG sensor is capable of monitoring the cable tension of built suspension bridges.

Strain Performance of Fiber Bragg Grating Sensor Fixed by Different Adhesives

2011 ◽  
Vol 301-303 ◽  
pp. 415-420
Author(s):  
Hua Ping Gong ◽  
Xiao Rui Li ◽  
Yong Xing Jin ◽  
Xin Yong Dong
Keyword(s):  
Epoxy Resin ◽  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Good Stability ◽  
Bragg Grating ◽  
Fbg Sensor ◽  
High Linearity ◽  
Different Temperatures ◽  
Low Sensitivity ◽  
Bragg Grating Sensor

The influence of fixing adhesives on strain performance of fiber Bragg grating (FBG) sensor was investigated. A FBG sensor was fixed on the uniform strength beam with three kinds of adhesives, which are modified acrylate, glass glue and epoxy resin. The linearity, sensitivity and their stability of FBG sensor fixed by three kinds of adhesives were measured and analyzed at the temperatures 0ºC-40ºC. The results show that, the FBG sensor fixed by the modified acrylate has a high linearity, sensitivity and stability at different temperatures. The FBG sensor fixed by the glass glue also has a high linearity and stability, but it has a low sensitivity. When the FBG sensor is fixed by epoxy resin, the sensitivity and linearity is affected significantly by the temperature. In addition, the performance of the FBG sensor fixed by the modified acrylate has a good stability for a certain period of time.

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