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Rp-Fatigue Behavior of Polymeric Composite Materials Reinforced by Activated Carbon Particles. pdf

Using natural reinforcement with polymer materials such as activated carbon (AC) as an alternative to synthetic reinforcement materials is an important topic nowadays. These plant-based reinforcements are degradable, eco-friendly, abundant and cheap, while synthetic reinforcement is expensive and negatively impacts the environments.
In this work, the effects of adding activated carbon (AC) powder with epoxy resin were investigated experimentally and numerically.
The particulate epoxy composites are manufactured using hand lay-up in vacuum technique with different weight fraction ratios of AC (0, 5, 10, 15, 20, 25, 30, 35 and 40) % wt. to find the best filling ratio which gives the highest mechanical and fatigue properties.
During this work, the particle size was measured by a laser particle size analyzer with an average size of about (14.74µm).
The interaction between epoxy material and AC powder was examined using Fourier Transform Infrared (FTIR) spectroscopy analysis. Moreover, the glass transition temperature (T_g) of the pure epoxy and composite material were measured by Differential Scanning Calorimeter (DSC).
The tensile strength and fatigue of the composite’s behavior were investigated experimentally and numerically; the fatigue behavior was described by S-N curves using the Basquin’s Equation.
The ANSYS workbench software program carried the numerical work.
The composites’ morphology and interaction between the matrix material and particles were investigated by conducting fracture surfaces of tensile and fatigue
specimens by(scanning electron microscope) (SEM) analysis to show the composites’ fracture.
The FTIR test results reveal no new peak after reinforcing epoxy with AC powder, proving a strong interaction between the epoxy resin and AC powder. The Differential Scanning Calorimeter DSC results show that the increase in AC powder fraction led to an increase in glass transition temperature (T_g) with percentage of increment 30.5% .
The FTIR analysis findings were supported by SEM analysis, which shows a good interaction and strong interfacial between matrix and powder.
The tensile strength values increased with increasing AC content up to 15 % wt. with a max value of 26.34 MPa increased by (18.87%), then it decreased to 18.15 MPa at 40 % wt. The ultimate fatigue strength was also increased with increased AC particles contents to reach the max value at 15% wt, increased by (18.18%).
3D finite element technique was used to model fatigue test numerically using ANSYS workbench program 16 to compare the S-N curves have the same behavior and the maximum percentage difference as does not exceed
(4.43 %). Also, this program was used to find available fatigue life, safety factor, and Von Mises stresses in specimens
Finally, the (SEM) was used for morphological inspection to investigate the tensile and fatigue failed specimens’ microstructure to show the fracture’s nature.