Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : composite


Investigation of Some Properties for Laminated Composite Used for Prosthetic Socket

Shereen A. Abdulrahman; Qahtan A. Hamad; Jawad K. Oleiwi

Engineering and Technology Journal, 2021, Volume 39, Issue 11, Pages 1625-1631
DOI: 10.30684/etj.v39i11.2050

Polyester has been used as a prosthetic socket base. It is well documented that the raw material of the socket base should have exhibited good mechanical properties. Prosthetic socket is a device that connects an artificial limb with the amputee part. In this work, seven laminated composites were prepared using vacuum technique from polyester resin and reinforced with Jute, Carbon, Glass, and Perlon fibers. The objective of this study is to manufacture prosthetic sockets from different laminated composite materials (fibers reinforced polymer) to make high-strength and durable prosthetic socket design. The results showed that the best laminated composite specimens have three jute fiber layers with four carbon layers whose compression strength and hardness reach (67) MPa and (86) Shore-D, respectively. Also, the water absorption of the composite specimen of jute with carbon fibers is higher than that of the composite specimen of jute with glass fiber.

Preparation of Lead Free Piezoelectric Composite Based on Polyester Resin and (LKNN6-0.5%CeO2) Ceramic Particles

Fadhil A. Chyad; Saad B.H. Farid; Hamza M. Kamal

Engineering and Technology Journal, 2016, Volume 34, Issue 13, Pages 2464-2471

For the sake of guarding the environment from the vital problems that results from the toxic effects of lead components, lead free (LKNN6-0.5%CeO2/polyester) piezoelectric composite are prepared in this work using cold press technique. Firstly, the lead free (LKNN6-0.5%CeO2) piezoceramics are prepared using normal sintering technique. The dielectric and piezoelectric properties of the composites were examined as a function of the volume fraction of ceramic particles, all composites showed well dispersion of the piezoceramic particles in the polyester matrix as shown in SEM images. The piezoelectric and dielectric coefficients were found to be improved as the concentration of ceramic particles increases. Although the procedure is simple, the composite prepared in this study exhibited better piezoelectric and dielectric constants with (d33=41 and Ԑr=157) at (80%) volume fraction.

Studying the Effect of Addition of Carbon Black on Rheological Properties of Polypropylene and Polycarbonate

Najat J. Salah; Abbas A. Jawad

Engineering and Technology Journal, 2013, Volume 31, Issue 5, Pages 976-991

In the present research the rheological properties of polymer melt composed of (polypropylene- polycarbonate ) unfilled_ filled with different amounts of Iraqi carbon black (2 – 7) wt% was studied. Single screw extruder was used for development of these blends . The rheological behaviour of these blends was investigated by using rotational concentric type rheometer .
The rheological properties shear rate( ( , apparent viscosity (a), dynamic viscosity(ή ), shear stress (τ) and angular frequency (ω),shearing flow at various temperatures ( 220 ˚C, 240˚C and 260 ˚C) were studied and found to be increase with increasing the amount of filler and decrease with increasing temperature. The flow curves were determined in the range of shear rate from about (10 to10 2 ) s-1. The activation energy was also measured, the values of activation energy varied from(11.939 to 20.892) KJ/Mole for different formation.

Strength and Ductility of Concrete Encased Composite Beams

Ammar A. Ali; Saad N. Sadik; Wael S. Abdul-Sahib

Engineering and Technology Journal, 2012, Volume 30, Issue 15, Pages 2701-2714

Experimental research was conducted to investigate the structural behavior of concrete-encased composite beams. Specimens were tested under lateral loading. The test results indicate that the behavior and failure mode of the beam are greatly affected by the steel beam core. The beams showed highly ductile behavior. The design flexural strength of concrete-encased beams is calculated from both the elastic and plastic stress distribution on the composite section. The deflection at the mid-span of the beam cannot be well predicted using linear elastic theory.

Influence of Temperature on Fracture Toughness of Jute Fiber Reinforced Unsaturated Polyester Resin

Akram R. Jabur

Engineering and Technology Journal, 2010, Volume 28, Issue 17, Pages 5481-5494

Jute fiber reinforced unsaturated polyester resin composites (J/UP) were
subjected to low velocity impact tests in several Temperatures degree in order to study the effects of temperature variance on the intrinsic fracture toughness Gc impact properties. An investigation was conducted onto the effects of temperatures on impact resistance of jute fiber-reinforced unsaturated polyester resin composite. Impact tests were performed on the specimens at different temperatures. The temperatures were 27, 50, 75 and 100 Cº. The results reflect the influence of ambient temperature on impact toughness measurements. The results
indicate an obvious correlation between the ambient temperatures and impact load, total absorbed energy and fracture toughness. The prepared specimens exhibited brittle fracture behavior with a lower peak load, lower impact energy and less time to fail compared with results at temperature higher Tg. The impact test results show that the total energy absorbed at 100 C° have higher energy when the composite behavior changed from brittle to ductilebehavior. The intrinsic
fracture toughness is higher for specimens tested in 100 Cº and 75 Cº and shows ductile behavior; while specimens tested with temperature lower than Tg show brittle fracture and lower Gc.

Microstructural Modification of Al-base Composite by Friction Stir Processing

Nawal Ezzat

Engineering and Technology Journal, 2010, Volume 28, Issue 6, Pages 1094-1105

A novel surface modifying technique, Friction Stir Processing, is used to
enhance mechanical properties of Al-Si / Al2O3 composite, through micro
structural refinement and homogenization. The effect of processing parameters on
resultant microstructure and wear rate is investigated in this work.
The Friction Stir Processing resulted in significant breakup of the coarse Si
and Al-dendrites and uniform distribution of Si and Al2O3 in the matrix with
significant micro structural refinement. These microstructures changes lead to
significant improvement in wear resistance of composite

Study Diffusion of Water to Carbon Fiber /Epoxy Composite

Adnan A. Abdul Razak

Engineering and Technology Journal, 2009, Volume 27, Issue 1, Pages 172-181

In present work moisture diffusion properties of the woven fabric carbon/epoxy
laminates were determined using weight gain, experiments over a temperature range of
30 0C to 60 0C. The laminate–shaped fiber reinforced composites were manufactured by
using epoxy resin (Epon 828) cured with TETA (tri ethylene tetra amine) reinforced with
carbon fiber. The prepared Composite samples were immersed in water for several
weeks and moisture content was measured. The diffusivity of the composite was found
to obey the Arrhenius relation over the entire range of temperature. Analytical solution to
Fick’s law is done by build up computer program in Matlab. Good agreement between
experiment data and analytical solution of Fick’s Law.

Study of Tensile Strength and Hardness Property for Epoxy Reinforced With Glass Fiber Layers

Emad S. Al-Hasani

Engineering and Technology Journal, 2007, Volume 25, Issue 8, Pages 988-997

Tensile strength and hardness property were studied in an epoxy (DGEBA)
resin as a matrix reinforced with glass fibers for different volume fraction as
layers.
A comparison was done between woven roven samples, random layers
samples and sandwich composite samples which consists of (woven roven and
random). Finally the results show that the sandwich composite gives higher
tensile strength, while the composite reinforced with woven roven fiber has
maximum hardness values.