Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Tensile Strength


Study the Mechanical and Physical Properties of Polyester Composite Reinforced by Multi Layers

Fadhil Abbas Hashim; Mohammed Sellab Hamza; Reham Raad Abdulla

Engineering and Technology Journal, 2016, Volume 34, Issue 9, Pages 1834-1843

In this research, a laminate composite has been prepared, using unsaturated polyester resin (UP) as a matrix reinforced with Kevlar fibers in different number of layers, glass fibers were added to the optimum product, by replacing one of the layers of Kevlar Fibers with a layer of Glass Fibers. Hand Lay-up method was used to prepare the test samples. To evaluate the composite material properties, tensile, hardness, impact, optical microscope tests were done.
The results of composite made of polyester reinforced with Kevlar Fibers show that the mechanical properties (Tensile strength, Modulus of elasticity, Hardness, Impact strength) increase with increasing the number of reinforced layers.
The best experimental values ofthe mechanical properties (Tensile strength, Modulus of elasticity, Hardness, Impact strength) were (190 MPa, 1.72 GPa, 79.25, and 68.75KJ/m2) respectively, for composite with three layers of Kevlar Fibers and then followed by composite with the sequence of layers (kevlar-glass-kevlar) and its mechanical properties (Tensile strength, Modulus of elasticity, Hardness, Impact strength) were (175.5 MPa, 1.69 GPa, 80, and 59.1 KJ/m2) respectively, Optical microscope shows welldistribution ofreinforcedlayers in composite.

The influence of the temperature on the ultimate tensile strength of the composite materials at constant Fiber volume fraction

Hussain J. Al-alkawi; Dhafir S. Al-Fattal; Abdul-jabar H. Ali

Engineering and Technology Journal, 2012, Volume 30, Issue 11, Pages 1935-1947

The aim of this work is to study the influence of the temperature on the ultimate
tensile strength (UTS) of composite material which is manufactured from polyester and
E-glass (woven roving, chopped strand mat) as a laminate with a constant fiber volume
fraction (VF) of 33%. The results showed a little effect of temperature on tensile
strength in the range of room temperature (RT) to 50 oC for laminates reinforced with
E-glass (woven roving) [0/90, ±45,0/90], [0/90]3, and [0/90, CSM, 0/90], but for
laminates reinforced with E-glass chopped strand mat (CSM), as [CSM] 3 and [CSM,
0/90, CSM], a continuous reduction in strength was observed with increasing
temperature from (RT) to 60 oC. The highest percentage reduction in strength was 23%
at 60oC as compared with (RT) for [CSM]3 laminate

Mechanical and Tribological Behavior of Glass- Polyester Composite System under Graphite Filler Content

Farag M. Mohammed; Drai A. Smait

Engineering and Technology Journal, 2012, Volume 30, Issue 4, Pages 672-683

Experimental investigations had been done in this work to demonstrate the effect of
graphite filler contents on the mechanical and tribological behavior of (30% volume
fraction) glass-polyester composite system. The stress-strain relations, modulus of
elasticity, yield stress, ultimate tensile strength and ultimate compression strength were
studied according to ASTM-D 638-87and ASTM-D 695 to present the composite
mechanical behavior. The wear rate and wear resistance were investigated according to
ASTM-D 5963 using pin on disc machine to present the composite tribological behavior.
The results showed that the mechanical and tribological properties behavior was
improved when the graphite filler content was increased up to 7.5% and then decreased
after that. At 7.5% filler content the modulus of elasticity, yield stress, ultimate tensile
strength, ultimate compression strength and wear resistance increased by (41%, 64%,
24%, 60% and 38%) greater than unfilled composite, while the wear rate was decreased
by 27% less than the unfilled one.

Effect of Fibers on Some Engineering Properties of Cement and Lime Stabilized Soils

Suhail A. Khattab; Ibrahim M. Al-Kiki; Abderrahmane H. Al-Zubaydi

Engineering and Technology Journal, 2011, Volume 29, Issue 5, Pages 886-905

Recently, many attempts were made to use metal fiber reinforcements to
improve some soil properties. In this research, the effects of fibers on the
compaction and mechanical properties of cement and lime stabilized soils (silty
and clayey soils respectively) were studied. Variables such as stabilizer (cement
and lime) content, amount and type of metal fibers were studied. Results indicated
that the addition of fibers lead to increase in the maximum dry unit weight. On the
other hand, a maximum values of unconfined and tensile strength were obtained
with the addition of 0.5 % short fiber (FS) and 1.5 % long fiber (FL) respectively.
During the flexural test a brittle manner failure was observed for the unreinforced
samples and samples prepared with little amount of fibers 0.5%. Finally, the
addition of fibers increases the fracture energy of cement stabilized silty soil and
lime stabilized clayey soil.

Effect of Additives Types and Contents on the Properties of Stone Matrix Asphalt Mixtures

Qais S. Kareem; Ahmed I. Ahmed; Noor M. Asmael

Engineering and Technology Journal, 2010, Volume 28, Issue 21, Pages 6414-6426

Stone Matrix Asphalt (SMA) is a gap-graded mix that is gaining popularity worldwide. SMA does not application in Iraq; in order for adopt the use of SMA mixtures particularly on high volume roads such as highways and urban intersections in Iraq. So, the new methodology has to be evaluated using Iraq materials and conventional laboratory methods to insure good performance in the Iraq's highway. The purpose of this study is to evaluate the effect of additives type and content on the performance of stone matrix asphalt mixtures. A detailed
laboratory study is carried out by preparing asphalt mixtures specimens using aggregate from Al-Nibaay, (40-50) grade asphalt from dourah refinery and two types of fiber (carbon fiber and polypropylene fiber) with percentages (0.2, 0.3, 0.4, 0.5%) by weight of total mix and two types of polymer (phenol and polyethylene) with percentages (7.5, 10, 12.5, 15%) by weight of total mix were tested in the laboratory. Compacted mixtures were tested to evaluate the effects on SMA bulk specific gravity, maximum specific gravity, void content, Marshall
Stability, Indirect Tensile Strength (ITS) and permanent deformation. Three different tests temperatures (20, 40,60C°) were employed in the creep test and two temperatures (5, 25 C°) were used in indirect tensile test to investigate the susceptibility of these mixes to change in temperature. The results clearly indicate the importance of using the proper type of stabilizing additive. According to the study results, polymers additives were found to be more effective than fibers
additives. SMA Mix modified with phenol additives can be used in cold and normal temperature area, whereas SMA Mix modified with polyethylene additive can be used in high temperature area.