Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : tensile

The Effect of Peanut and Walnut Shells powders on Tensile and Microstructure of the PMMA for prosthetic Denture

Zainab M. Abdul Monem; Jawad K. Oleiwi; Qahtan A. Hamad

Engineering and Technology Journal, 2021, Volume 39, Issue 2A, Pages 196-205
DOI: 10.30684/etj.v39i2A.1730

In the current research, the heat-cured matrix material powder of PMMA was reinforced with Peanut and Walnut Shells (natural powders) which are chemically treated with 5% (w/v) (NaOH) to improve the matrix bonding (PMMA) before being used as a reinforcing powder and adding to exactly similar averages particle sizes ≤ (53μm), with different weight fractions of (4, 8, and 12 wt.%). The results indicated that the Elastic modulus values reached their maximum value at (8 wt.%.) when reinforced with Peanut Shells powders (1.053Gpa), while, the values of tensile strength, elongation percentage at the break, decrease as the weight fraction of Peanut and Walnut Shells powders increase and the lowest values are obtained by reinforcing with Peanut Shells powders to reach their minimum values at (12 wt.%) where the lowest values of them are (29 MPa, 2.758%) respectively. The fracture surface morphology of pure PMMA seemed to be homogenous morphology in (SEM) test, whereas the fracture surface morphology of PMMA composite reinforced by (Peanut and Walnut Shells) powders and shows a smoothness fracture surface morphology this refers to brittle to semi ductile or ductile transformation.

The Formability and Elongation of Aluminum Alloys AA5083 and AA3003 for Micro-Truss Sandwiches Manufacturing

Arwa F. Tawfeeq; Matthew R. Barnett

Engineering and Technology Journal, 2020, Volume 38, Issue 9, Pages 1396-1405
DOI: 10.30684/etj.v38i9A.556

The development in the manufacturing of micro-truss structures has demonstrated the effectiveness of brazing for assembling these sandwiches, which opens new opportunities for cost-effective and high-quality truss manufacturing. An evolving idea in micro-truss manufacturing is the possibility of forming these structures in different shapes with the aid of elevated temperature. This work investigates the formability and elongation of aluminum alloy sheets typically used for micro-truss manufacturing, namely AA5083 and AA3003. Tensile tests were performed at a temperature in the range of 25-500 ○C and strain rate in the range of 2x10-4 -10-2 s-1. The results showed that the clad layer in AA3003 exhibited an insignificant effect on the formability and elongation of AA3003. The formability of the two alloys was improved significantly with values of m as high as 0.4 and 0.13 for AA5083 and AA3003 at 500 °C. While the elongation of both AA5083 and AA3003 was improved at a higher temperature, the elongation of AA5083 was inversely related to strain rate. It was concluded that the higher the temperature is the better the formability and elongation of the two alloys but at the expense of work hardening. This suggests a trade-off situation between formability and strength.

Effect of Particle Size on Mechanical Properties of the Recycling Compact Disks Reinforced Epoxy

Shayma J. Ahmed

Engineering and Technology Journal, 2018, Volume 36, Issue 6A, Pages 641-645
DOI: 10.30684/etj.36.6A.7

The recycling of CDs or DVDs (compact disks) as a filler in polymer composites can be used in many engineering applications such as electrical, automobile, and building applications. In the present paper, composite materials were prepared of epoxy resin reinforced with three different particles size (600˂d˂850, 200˂d˂600, d˂200 μm) of recycling of CDs or DVDs (a very thin aluminum layer is used to record information). Hand lay-up technique was conducted to produce composite material samples. Different types of tests, such as tensile, bending, impact, and hardness were applied on these samples. The mechanical characteristics of the composite samples were analyzed. The finding observed that smaller chopped of CDs or DVDs reinforced epoxy had better tensile, bending, hardness, and impact properties.

Studying the Tensile and Buckling for PMMA Reinforced by Jute Fibers for Prosthetic Pylon

Jawad Kadhim Oleiwi; Shaymaa Jumaah Ahmed

Engineering and Technology Journal, 2016, Volume 34, Issue 1, Pages 111-122

The main objective of this research is studying the tensile and buckling of Jute fibers reinforced composite by varying the number of Jute fibers layers and fibers angle (±45°&0°/90°). Vacuum bagging technique was adopted for the preparation of laminated composite specimens that made from PMMA as matrix and Perlon layers with different number of Jute fibers layers as reinforcement materials. Also the finite element method (ANSYS-15) was used by creating a model of prosthetic pylon and applied compressive load at heel strike step from gait cycle to know the critical buckling stress. The results showed that the best laminated composite specimens have three Jute fibers layers at (0 º /90 º) fibers orientation relative to applied load. Where, the critical buckling stress, tensile strength, and modulus of elasticity were (442MPa, 61MPa, and 3.75GPa) respectively, while, the percentage elongation was (2.1).

Tensile and Buckling Analysis of the Polymer Composite Beam Reinforced by Natural Jute Fiber

Mohamad Ali Tariq; Qahtan Adnan Hamad; Mohamad K. Alwan

Engineering and Technology Journal, 2011, Volume 29, Issue 1, Pages 129-140

This research focuses on the preparation of polymer matrix composite
material by (hand lay – UP) method, where the material was prepared from
unsaturated polyester resin (up) as a matrix reinforced by natural jute fiber with
different volume fractions (3%, 4%, 5%, 6%).The experimental work and finite
element techniques were used to analysis the tensile and the buckling analysis of
the composite beam reinforced by natural jute fiber at different volume fraction.
The results of experimental work of the modulus of elasticity were in the
range of the theoretical results. The critical load increased with increase the fiber
volume fraction that ( cr P =610N) at ( f V = 3%) and ( cr P =830N) at ( f V =6 %) for
the experimental results.While ( cr P =619N) at ( f V = 3%) and ( cr P =877N) at
( f V =6 %) for the finite element results.