Stress relaxation behavior of starch powder-epoxy resin composites

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
George C. Papanicolaou ◽  
Lykourgos C. Kontaxis ◽  
Anastasia F. Koutsomitopoulou ◽  
Stephanos P. Zaoutsos
Keyword(s):  
Stress Relaxation ◽  
Epoxy Resin ◽  
Relaxation Behavior ◽  
Resin Composites ◽  
Stress Relaxation Behavior ◽  
Epoxy Resin Composites

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.

Investigation of space charge behavior in self-healing epoxy resin composites

2021 ◽  
Author(s):  
Muhammad Zeeshan khan ◽  
Muhammad Hamza Younes ◽  
Aurang Zaib ◽  
Umar Farooq ◽  
Asim khan ◽  
...  
Keyword(s):  
Space Charge ◽  
Epoxy Resin ◽  
Resin Composites ◽  
Self Healing ◽  
Epoxy Resin Composites
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