Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Composite materials

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.

Investigation of Tensile and Impact of Composite Materials Reinforced with Natural Materials

Alaa Abd Mohammed

Engineering and Technology Journal, 2015, Volume 33, Issue 4, Pages 919-933

This work focuses on studying the effect of Data Seeds (DS) and Olive Seeds (OS) particles on tensile and impact properties of epoxy resin. Olive and dates seeds powder were added to epoxy matrix at weight fraction (0, 8, 13, &18 wt %) with grain size (300, 450 & 600µm). The composite specimens were prepared by Hand-Lay-up technique and cut according to standard test. It's found the higher value of modulus of elasticity and tensile strength happened at (=18 wt %) and grain size (300µm) for specimens reinforced with olive seeds powder, but obtained the lower percentage of elongation at break, impact strength and fracture toughness at this value. Also the mathematical model results show that the weight fraction of powder have higher effect than grain size on properties.

Numerically and Experimentally Studying of some Mechanical Properties of the Polyester Matrix Composite Material Reinforced by Jute Fibers

Jawad Kadhim Oleiwi; Mohamad K. Alwan; Qahtan Adnan Hamad

Engineering and Technology Journal, 2014, Volume 32, Issue 9, Pages 2235-2247

This research focuses on the preparation of polymer matrix composite material by (hand lay – up) method, where the material (rectangular beam) was prepared from unsaturated polyester resin as a matrix reinforced by natural jute fiber with different volume fraction (3%, 4%, 5%, 6%).
Numerical studies by using finite element method (Ansys 11 package) to study the effect of selected volume fractions of jute fibers on the bending properties.
Results of this experimental research indicate that increasing the volume fraction of jute fibers lead to increase bending modulus of elasticity.
The values of flexural strength and shear stress increase with the increase of jute fibers volume fraction while the values of deflection and maximum strain decreases for both experimental and numerical studies.

Studying the Dry Sliding Wear for Composite Material of Base (Al-4%Cu) Reinforcement by Silicon Carbide Particles

Ahmad Ali Akbar Akbar; Hijran Zinalabiden; Waleed T. Rashid

Engineering and Technology Journal, 2014, Volume 32, Issue 6, Pages 186-195

This work is concerned with a study of dry sliding wear of Aluminum bace alloy of (Al-4%Cu) reinforcement by silicon carbide particles with different percentage (3, 6,9,12 wt %SiC). Composite materials prepared by stir casting method using vortex technique. The base alloy and composite materials samples were tested to investigate wear behavior, using Pin -on-Disc technique, by examining some variables of wear such as applied load, sliding speed, and sliding time. The results showed that wear rate increases with applied load and sliding time, while increasing the sliding speed and the percentage of SiC decreases the wear rate, as well as the alloy containing (12wt% SiC) showed better wear resistance compared with other alloys .

Using Al2O3-Mgo-PSZ ceramic system in cutting tools manufacturing

Engineering and Technology Journal, 2009, Volume 27, Issue 7, Pages 250-257

Recent advance in high-speed cutting materials have focused on reinforcing
alumina with different carbides and nitrides in order to improve hardness and fracture
toughness, this composites materials use in cutting tools application. The present study
concert on properties of cutting tools made by Al2O3 reinforcement by Mg-PsZ. The
added weight fractions from ZrO2 are (15% , 20%). The materials cold-pressed at (5, 7,
10) ton, at (1400, 1500, 1600 Co) in two hours. The result shows increasing in hardness
and densities values of specimen with the increasing the mixing percent also, there is a
signification enhancement of specimen properties with increased temperature and
pressure, the approperte temperature is 1600 Co with pressure 10 ton.