Effect of Long-Term Thermal Relaxation of Epoxy Binder on Thermoelasticity of Fiberglass Plastics: Multiscale Modeling and Experiments

The work is devoted to the prediction and experimental research of the elastic bending modulus of glass-reinforced plastics with an epoxy matrix on anhydride hardener reinforced with different glass fabrics. Experimental studies have been carried out to assess the effect of thermal relaxation of the...

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Bibliographic Details
Published in:Polymers 2022-04, Vol.14 (9), p.1712
Main Authors: Mishnev, Maxim, Korolev, Alexander, Ekaterina, Bartashevich, Dmitrii, Ulrikh
Format: Article
Language:English
Subjects:
Aging
Bending modulus
CAD
Composite materials
Computer aided design
Construction
Curing
Elastic bending
Epoxy resins
Fabrics
Fiberglass
Finite element method
Glass fiber reinforced plastics
Glass transition temperature
Glass-epoxy composites
High temperature
Homogenization
Manufacturers
Mechanical properties
Modules
Modulus of elasticity
Plastics
Polymers
Reinforced concrete
Reinforced plastics
Temperature
Textile composites
Thermal relaxation
Thermoelasticity
Viscosity
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Summary:The work is devoted to the prediction and experimental research of the elastic bending modulus of glass-reinforced plastics with an epoxy matrix on anhydride hardener reinforced with different glass fabrics. Experimental studies have been carried out to assess the effect of thermal relaxation of the polymer matrix structure due to long-term exposure to elevated temperatures (above the glass transition temperature of the polymer matrix) on the GRP elastic bending modulus at temperatures ranging from 25 to 180 °C. It has been shown that due to the thermal relaxation of the polymer matrix structure, the GRP modulus increases significantly at temperatures above 110 °C and decreases slightly at lower temperatures. Using a multiscale simulation based on a combination of the finite-element homogenization method in the Material Designer module of the ANSYS software package and three-point bending simulation in the ANSYS APDL module, the elastic modulus of FRP was predicted concerning the temperature, its averaged structural properties, and thermal relaxation of the polymer matrix structure. We have also carried out the prediction of the temperature dependences of the modulus of elasticity of glass-reinforced plastics on different types of glass fabrics in the range from 25 to 200 °C by using the entropic approach and the layered model.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14091712