Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Impact strength


Impact Strength, Flexural Modulus and Wear Rate of PMMA Composites Reinforced by Eggshell Powders

Aseel M. Abdullah; Hussein A. Jaber; Hanaa A. Al-Kaisy

Engineering and Technology Journal, 2020, Volume 38, Issue 7, Pages 960-966
DOI: 10.30684/etj.v38i7A.384

In the present study, the impact strength, flexural modulus, and wear rate of poly methyl methacrylate (PMMA) with eggshell powder (ESP) composites have been investigated. The PMMA used as a matrix material reinforced with ESP at two different states (including untreated eggshell powder (UTESP) and treated eggshell powder (TESP)). Both UTESP and TESP were mixed with PMMA at different weight fractions ranged from (1-5) wt.%. The results revealed that the mechanical properties of the PMMA/ESP composites were enhanced steadily with increasing eggshell contents. The samples with 5 wt.% of UTESP and TESP additions give the maximum values of impact strength, about twice the value of the pure PMMA sample. The calcination process of eggshells powders gives better properties of the PMMA samples compared with the UTESP at the same weight fraction due to improvements in the interface bond between the matrix and particles. The wear characteristics of the PMMA composites decrease by about 57% with increases the weight fraction of TESP up to 5 wt.%. The flexural modulus values are slightly enhanced by increasing of the ESP contents in the PMMA composites.

Flexural and Impact Properties of Epoxy Composites Reinforced with Peanut Shell Particles

Hwazen Fadhil

Engineering and Technology Journal, 2020, Volume 38, Issue 7, Pages 1026-1033
DOI: 10.30684/etj.v38i7A.584

Natural materials have been extensively used as reinforcements in polymer matrices instead of non-degradable synthetic reinforcement such as carbon, glass or aramid. The use is because of their low density, good mechanical properties, availability, and biodegradability. Peanut shell is one such natural waste filler used, and it contains cellulose, hemicellulose, and lignin. Natural fiber/particle sources are not only strong and lightweight but are relatively very cheap. This paper offers the comparison of the flexural, and impact energy test properties of the peanut shell reinforced with the epoxy resin matrix. Peanut shells add into the epoxy resin matrix with various weight fractions (2%, 4%, 6%, and 8%) and have been fabricated by hand lay-up procedure. Flexural strength and flexural modulus changed from (140MPa) to (160 MPa), and from (2 GPa) to (7.79 GPa) respectively, impact strength, and fracture toughness changed from (2.5 KJ/m2) to (7 KJ/m2), and from (2.23 MPa.m1/2) to (7.07 MPa.m1/2), respectively as a function of the particle weight fraction. The highest flexural strength and modulus obtained samples (reinforced 4% wt. peanut shell), while samples (reinforced +8% wt. peanut shell) provided the highest impact strength and fracture toughness.

Analysing Some Mechanical Properties of Cinnamon Powder Reinforced with Polymeric Materials Used in Dental Application

Ahamed M. AlGhabban; Reem A. Mohammed; Jumaah R. Mahmood

Engineering and Technology Journal, 2019, Volume 37, Issue 3A, Pages 96-105
DOI: 10.30684/etj.37.3A.4

In the dentures industry, materials must be chosen to have good mechanical properties in order to resist the conditions that may occur in the mouth. A study was conducted to assess tensile strength, elasticity coefficient, elongation, flexural strength, flexural modulus with impact properties of poly methyl methacrylate resin as matrix strengthened with cinnamon powder and also analysing these mechanical properties by using (OriginLab) software program. The samples of Poly Methyl methacrylate bio composites which containing 2%, 4%, 6%, and 8% weight fractions of cinnamon powder and an unfilled as control sample were fabricated using “hand lay up” method. The results indicate that the addition of 8% weight fraction cinnamon powder into Poly Methyl methacrylate resin improved of ultimate tensile strength, modulus elasticity ,flexural strength, flexural modulus (62 MPa, 3.7 GPa, 96 MPa, 6.4 GPa) respectively, compared with the values of pure Poly Methyl methacrylate (51 MPa, 1.5 GPa, 78MPa, 2.0 GPa) respectively. Also can be noted that the elongation at break values decreases with an increase in weight fractions of filler, where the sample (Poly Methyl methacrylate +2% cinnamon) has the best value for elongation compared with samples reinforced (4%, 6% and 8% wt). The impact strength results observe the maximum value was present in the sample (Poly Methyl methacrylate+6% cinnamon). From the results, descriptive, One Way ANOVA statistical analysis and means comparison by used (Scheffe test and Tukey test) for all mechanical properties indicated, turns out if Sig equals 1 shows that the variance in mean is significant at the level of 0.05, whereas Sig is 0 designates that the mean variance is not significant at the level 0.05.

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.

Effect of Nano SiO2 Particles on some Physical Properties of (UP/PU) Blend Composite

Hanaa Sh. Mahmood

Engineering and Technology Journal, 2016, Volume 34, Issue 1, Pages 93-99

The effect of SiO2 physical properties (Shore D hardness, impact strength, 3 pts bending, thermal conductivity, and weight gain) after and before immersion in different liquid solution (water, HCL 0.2 N , and NaOH 0.2 N), of (UP/PU) blend was studied. Hand lay-up technique was applied using unsaturated polyester and polyurethane blend as a matrix and silicon oxide nano particles (Nano SiO2) as a filler with volume fraction (3% Vf ) .
Results showed that liquids affected bending properties and thermal conductivity (k) by decreasing values, while the impact strength, and weight gain also studied for 4 weeks and it increase with increasing of immersion time in liquids.

Studying the Impact Strength of (Epoxy with TiO2 and MgO) Composite

Balkees M.Deya; Fawziea M. Hussien; Intihah Gatia Dway

Engineering and Technology Journal, 2011, Volume 29, Issue 10, Pages 1971-1978

This work has been done with using of epoxy resin mixed with polystyrene
(90/10) % to compose binary blend. Two types of powder (TiO2, MgO) in two volume fractions of (10, 15) % were used as reinforcement materials to the prepared polymer (B).Hand lay-up technique is used in fabrication of the composite samples. Impact test was carried out for the proper samples in both normal condition and after immersion in water, KOH (0.5 N), HCL (0.5 N) solutions for periods ranging up to 8 weeks. After comparing the results between the polymer blend and their composite, it was found that Impact Strength were greater for the matrix (B) after immersion compared with their values before
immersion while the results of the composite before immersion show that
(B+10%MgO) has higher impact strength (11.333) KJ/m2