Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Glass Fibers

Numerically and Theoretically Studying of the Upper Composite Complete Prosthetic Denture

Sihama I. Salih; Jawad K. Oleiwi; Qahtan A. Hamad

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 1023-1037

The current study focused on the manufacturing and development properties of upper prosthesis complete denture from composite materials with the basis cold cured resin of poly methyl methacrylate as new fluid resin and reinforced materials by two different types of particles (nano-hydroxyapatite (nHA), micro zirconia (ZrO2)), that added with different volume fractions of (1%, 2% and 3%), and the different types of woven fibers (Glass fiber, Kevlar fiber), it were added with a fixed volume fraction of (5%) to PMMA composites.Specimens’ consist of a six groups where prepared by using (Hand Lay-Up) method from the composites materials and hybrid laminated composites materials. This research includes theoretical and numerical studies by using finite element method to confirming the experimental results of the effect of selected volume fractions of theseparticles and fibers on the (total deformation distribution, equivalent elastic strain and equivalent Von Mises stress) of the composite prosthetic dentures.
The theoretical part included calculations the values of theoretical safety factor and Poisson's ratio. While the numerical part based on finite element method (F.E.M), which was performed by using program (ANSYS-15) to analyze the prepared of denture composite materials and evaluate its characteristics which represent total deformation distribution, equivalent stress and equivalent elastic strain. This was performed by obtaining twenty one models for the PMMA composite dental prostheses which were treated as three dimension structure. The numerical results of the F.E.A showed coincided with some of the experimental results.

Mechanism of Hybrid Reinforcement and its Effect on some Properties of Binary Polymer Blend

Awham M. Hameed; Entihaa G. Daway

Engineering and Technology Journal, 2014, Volume 32, Issue 2, Pages 287-301

The aim of current study is carrying out some modifying in properties of resin material (Unsaturated polyester, UPE) by adding thermoplastic material (polystyrene, PS) with different weight ratios included (0%, 5%, 10%, 15% and 20%) of (PS) to prepare binary polymer blend.
The optimum ratio was selected in terms of the homogeneity case between the two polymers and studying the nature of the surfaces of the prepared materials using the optical microscope. Some mechanical tests were performed to determine the values of impact strength (I.S), ultimate tensile strength (UTS) for all prepared specimens.
The ratio (80/20, weight/weight)% of (UPE/PS) blend was selected and reinforced with fibers volume fraction Фf = 10% using three types of fibers included
(glass fibers (G.F), Carbon fibers (C.F) and hybrid from the two types (5% G.F and 5% C.F). All the above tests were repeated after the reinforcement for comparing the results and studying the behavior of materials under work. The results exhibited that the values of (I.S) increase with increasing of the blending ratio of (PS) while the values of (UTS) decrease at blending ratios (10, 15) % of (PS) and return to increase at the ratio 20% . After the reinforcement, it was found that the composite reinforced with carbon fibers records the highest values of impact strength for un notch specimens while the hybrid composite has the highest value of the ultimate tensile strength comparing with E-glass and carbon fibers composites.

Numerical and Experimental Analysis of the Bending Deflection of the Composite Beam

Mena Faisal Khdeer

Engineering and Technology Journal, 2013, Volume 31, Issue 3, Pages 563-572

This work studies the numerical and experimental bending deflection of 3-point test of the composite beam made of epoxy reinforced by glass fibers and carbon fibers at different volume fractions .The results show that the deflection decrease in nonlinear relationship with increase volume fraction for both glass fibers and carbon fibers .The maximum difference between the experimental results and the finite element results difference was (11 %) at load (=20 N) and fibers volume fraction (Vf= 10 %) for glass fibers reinforcement. Also the results indicated that the maximum deflection was (1.65mm) when reinforced by glass fibers at (Vf =10 %) and at load (= 20 N) experimentally, while the maximum value of deflection was (0.55mm) when reinforced at the same load and fibers volume fraction.

Studying Mechanical Properties For Polymer Matrix Composite Material Reinforced By Fibers And Particles

Engineering and Technology Journal, 2010, Volume 28, Issue 4, Pages 81-93

The work focuses on the preparation of hybrid polymer matrix composite
materials prepared from the unsaturated polyester resin as matrix reinforced by woven
glass fiber kind ( E-glass ) and graphite particles as first group of samples and the second
group of samples reinforced with woven Kevlar fiber kind (49) instead of glass fiber.
This work includes studying the effect of selected volume fractions ( 0% , 5% , 10% ,
15% , 20% ) of graphite particles with mixture of different particle Size of ( 25 μm – 106
μm ) on the properties of the prepared composite materials, Number of mechanical tests
were done,they include (Tensile, Compression, Impact, Flexural Strength, Shear Stress
and Hardness), which done at room temperature Result of the work shows that the
values of (Tensile stress, Tensile elastic modulus, Fracture Toughness, Hardness)
increase with the increase of graphite particle volume fraction for both groups samples.
As well as the values of the (Compression elastic modulus, Flexural strength, Shear
stress) increase with the increase of low values of graphite particles volume fraction for
both groups of samples. Where as the values of Impact strength of the prepared
composite material decreased with the increases of volume fraction of graphite particles
for both group samples. As well the result shows that the values (Tensile stress, Tensile
elastic modulus, impact strength, Fracture toughness) for hybrid composite materials
reinforced by Kevlar fiber are higher than values reinforced by glass fiber instead of
Kevlar fiber, While the values of (Compression stress, Flexural Strength, Shear stress,
Hardness) for hybrid composite materials reinforced by glass fiber are higher than values
reinforced by Kevlar fiber instead of glass fiber.