Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Machine Design

Design, Fabrication, and Testing of an Electromechanical High-Temperature Tensile Test Machine

Taif Y. Ghadhban; Hussain J.M Al-ALkawi; Ahmed H. Reja

Engineering and Technology Journal, 2021, Volume 39, Issue 4A, Pages 614-624
DOI: 10.30684/etj.v39i4A.1911

The following paper presents a developed design and manufacturing of a servo-driven Electromechanical high-temperature tensile machine with an integrated environmental chamber. The maximum load capacity is set to be 20 kn with the possibility of future upgrades. The machine is automated by a computerized system that controls the entire operation of the designed machine. It is designed to be capable for testing a variety of materials at various temperatures ranging from room temperature up to 500℃. The machine was fully controlled using automated software to control the entire operation and to provide users with a certified test report. The main component is a high-quality aluminum frame that hosts the entire setup, like a furnace, and a universal type gripping mechanism. The structure is monitored by precise measurement instrumentation and a dependable data acquisition system. The machine was validated by testing AA6063-T6 to evaluate the sophistication of the machine's functionality. The results then compared to an international standard, provided close results with a low percentage error of about 4.5% compared to international standard readings.

Effect of Shaft Misalignment on The Stresses Distribution of Spur Gears

Hani Aziz Ameen

Engineering and Technology Journal, 2010, Volume 28, Issue 7, Pages 1321-1339

Shaft misalignment is considered as one of the common repeated
problems in most rotating machineries , which leads to generate vibrations and
extra dynamic loads on transmitting gears teeth, also leads to non- uniformity in
distribution of applied load along the meshing tooth face by being concentrated on
one side of tooth face. The present work concentrated on the analysis of stresses
generated on transmitting gear tooth, also studied the effect of misalignment angle
on stress distribution and its concentration. This is important for the gear design
and those who works in gear maintenance , because fracture is expected to initiate
and propagate at locations of stress concentration . ANSYS program using finite
element technique had been used, as this program is efficient and accurate tool in
stress analysis, especially for complicated shapes. Gear tooth model had been
analyzed using finite element method in three dimensions. After calculating
transmitted load and dynamic load, misalignment angle had been changed from
(0°,0.2°,0.3°,0.4°,0.5°) then its effect on distribution of applied load had been
calculated. The finite element program (ANSYS) had been executed for cases of
misalignment angle (0°,0.2°,0.3°,0.4°,0.5°). The results showed clearly, that the
stresses distribution and its concentration on tooth changed with misalignment
angle and the equivalent stress is direct proportional with the misalignment angle.
According to the values of generated stresses, the tooth fracture can be predicted