Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Unsaturated polyester

Heat and Chemical Treatments for Sawdust/UPE Composites

Mohammed H. Alzuhairi; Kadhum M. Shabbeb; Sally A. Hussain Alsaedy

Engineering and Technology Journal, 2016, Volume 34, Issue 8, Pages 1624-1635

Sawdust filler taken from White Cham (a type of wood) were mixed with unsaturated polyester (UPE) at 20, 30 and 40% volume fractions. the mechanical and physical properties of the composites treated by NaOH alkali at 0.5, 1, 1.5 and 2% (W/V) along the effect of volume fractions were investigated .The results showed improving in properties comparing with untreated sawdust filler, while heat/alkali treatment at 2%NaOH at different temperature 40, 60, 80 and 100 ˚C also showed improving in properties .the optimal mechanical properties had been obtained at 1% NaOH, and detracted at 2% NaOH. Yet, the mechanical properties at 2% NaOH were improved when heat treated. The optimal mechanical properties were obtained at 80 ˚C. It is worth mentioning that the optimization process was based on the tensile test. Also the thermal conductivity results show better insulation after the treatments especially at 100 oC.

Experimental and Numerical Analysis of Bulletproof Armor Made from Polymer Composite Materials

Jawad Kadhim Oleiwi; Abass Khammas Hussein; Sura Hameed Ahmed

Engineering and Technology Journal, 2015, Volume 33, Issue 7, Pages 1583-1597

This work focuses on the preparation of polymer matrix composite specimens by (Hand Lay-Up) method to make bulletproof armor from the unsaturated polyester resin (UP) as a matrix reinforced by Kevlar fibers at different volume fractions with and without (3%) of Al2O3 powder. The tensile test was performed for these composite specimens which include: (modulus of elasticity, tensile strength and elongation percentage), in addition of ballistic test were studied.
The results of this work show that the values of tensile test increase with increasing the volume fraction of fibers. And the values of tensile test of a composite reinforced by kevlar fibers and addition (3%) of Al2O3 powder was less than those composite without addition of Al2O3 powder.
The numerical method based on FEM was used to analysis of the bullet proof armor ballistic test of the composite specimens by finding the values of stresses, strains and deformations.
The numerical results that obtained from the program (ANSYS 14.5) represent the maximum value of stress happened to the composite specimens when reinforced by eight layers of the kevlar, and vice versa to the deformations and strain also the numerical results shown a good agreement with results that were obtained experimentally.
Results of ballistic test of composite specimens show the volume fraction of fibers has an effect on the deformations of the front face and back face of these composite specimens. And the values of the ballistic test for the composite reinforced by kevlar at eight layers give the best values from other each of composite specimens.

Study of The Wear Rate of Some Polymer Materials In Different Conditions

Awham M. H; Sadeer M. M; Bushra H. M

Engineering and Technology Journal, 2010, Volume 28, Issue 16, Pages 5165-5170

The current investigation is interested by study of the wear phenomenon for two polymeric materials (Epoxy and Unsaturated polyester) resins, the prepared specimens were tested at room temperature by using two different loads(10,20)N for various testing times with different sliding distances. The resulted wear rates were calculated for each sample apart with. Variation the previous variables. To produce more precise idea about the wear characteristics of both above materials when immersed them in water environment, the study of wear rates was carried out for different immersion times at different temperatures when the above mentioned variables were fixed. It was found after comparing the results which obtained from the wear test in air that
Epoxy resin undergoes higher wear rates than unsaturated polyester resin in general with variation the testing parameters, while the results of immersion in water which acts as plasticizing factor for polymers exhibited different effect on the wear behavior of the materials under study.