Engineering and Technology Journal

Improvement of Surface Roughness in Single Point Incremental Forming Process by the Implementation of Controlled Vibration

Reham A. Nema; Mauwafak A. Tawfik; Muthanna H. Sadoon

Volume 40, Issue 1 , January 2022, , Page 217-225

https://doi.org/10.30684/etj.v40i1.2244

Abstract

Vibration implementation that assists metal forming has many advantages, such as enhancement of surface equality, reducing the forming force and decreasing the stresses. The technology ... Read More ...

Effect of Cracks on the Natural Frequency of Cylindrical Shell Structures

Marwah . A. Husain; Mohsin A. Al-shammari

Volume 38, 12A , December 2020, , Page 1808-1817

https://doi.org/10.30684/etj.v38i12A.1513

Abstract

Shell structures are liable to different kinds of defects and damage like cracking and corrosion which may destroy their structural safety and affect the service life. The cracks' effects ... Read More ...

Numerical Study of Effect of Using Nanofluids Flowing in Simply Supported Pipes on Vibrations Characteristics

Kadhum A. Jehhef; Mohamed A. Siba; Hayder S. Abdulamir

Volume 38, 1A , January 2020, , Page 43-56

https://doi.org/10.30684/etj.v38i1A.1595

Abstract

In general, internal vibrations within the pipelines caused by fluids being passing through a pipeline system can cause. These pipeline system can damage by the sudden amplified vibrations ... Read More ...

Investigation Vibration Damping in the Hydraulic Systems by Using an Accumulator

Walaa M. Hashim; Huda A. Al-Salihi; Hisham A. Hoshi

Volume 36, 12A , December 2018, , Page 1267-1282

https://doi.org/10.30684/etj.36.12A.9

Abstract

It is generally accepted that the vibration of fluid power systems considered to be one of the major problems that is normally occurred in the hydraulic system, which causes a noise ... Read More ...

A Comparison Study of Underwater and Land Flexible Manipulators

Mohammed J. Mohammed

Volume 36, 6A , June 2018, , Page 664-671

https://doi.org/10.30684/etj.36.6A.11

Abstract

New results for experimental comparison of flexible underwater and land manipulator have studied in this research. A new experimental rig and test basin have designed to present the ... Read More ...

Effect of Re-vibration Process on Axial Capacity of Short Reinforced Concrete Circular Columns

S.A. Abbas

Volume 35, 7A , July 2017, , Page 776-787

https://doi.org/10.30684/etj.35.7A.15

Abstract

A considerable amount of research work has been performed on the effects of vibrating of fresh concrete on the reduction of shrinkage and creep, the improvement bond stress between ... Read More ...

Effect of Vibration on the Heat Transfer Process in the Developing Region of Annulus with Rotating Inner Cylinder

Mauwafak A. Tawfik; Akeel A. Mohammed; Hayder Zuhair Zain

Volume 33, 3A , April 2015, , Page 590-611

https://doi.org/10.30684/etj.33.3A.6

Abstract

Experimental investigation has been carried out to study the effect of induced vibration on the heat transfer process in the simultaneously developing of hydrodynamic and thermal boundary ... Read More ...

The Influence of The Hydraulic Pumps Design Characteristics and Temperature of Mineral Oil on The Stability of Actuator

Abdul Karim Swadi Saleh; Farid Abou Hamed; Jafer Mehdi Hasan

Volume 32, Issue 10 , October 2014, , Page 324-337

https://doi.org/10.30684/etj.32.10A.19

Abstract

Much research dealt with the problem in the pulsation of hydraulic pumps, studies, research and literature for vibration did not interfere with the effect of the medium which make vibrations ... Read More ...

Finding the Weight Loss Rate of Metallic Surfaces Exposed To Corrosion Presence of Vibration (Corrosion - Vibration)

Mouhmad Abdultef Ahmed

Volume 30, Issue 20 , December 2012, , Page 448-462

https://doi.org/10.30684/etj.30.20.14

Abstract

In this research the structural steel type (A36) samples were prepared by traditional preparation operations , chemical composition of samples was analyzed , hardness tested, then testing ... Read More ... In this research the structural steel type (A36) samples were prepared by traditional preparation operations , chemical composition of samples was analyzed , hardness tested, then testing corrosion was achieved for two major cases, a general corrosion case when the corrosive medium (sea water) is static for five days period ,and the second case is the corrosion with presence of mechanical vibration, which included two branch cases , first case; corrosion of vibrated samples with the vibrated corrosive medium, and the second case when the samples are fixed and corrosive medium is vibratory , a total test period is five hours for each case ,then found weight loss and the corrosion rate of all cases of corrosion mentioned by a traditional weight loss method , as well as study the microstructures before and after the corrosion cases and to find an experimental mathematical formula that illustrate the relationships between corrosion and corrosion with presence of vibration, note that the used device to study the mechanical vibration effect was locally designed and manufactured, according to the modified American Standard (ASTM G32).Observed that the weight loss and corrosion rate reached the highest value in the second case of corrosion with presence of mechanical vibration (fixed samples and corrosive medium is vibratory), followed by the first case of corrosion with presence of mechanical vibration (vibrated samples with the vibrated corrosive medium), and less the value of the corrosion rate and weight loss is the state of general corrosion (corrosion in the static medium). It was noted that the microstructure of the structural steel became uniformly corroded after general corrosion case (in static corrosive medium) and corrosion regions were spread or scattered over all parts of the sample surface on a regular basis, while the microstructure in the two cases of corrosion with presence of mechanical vibration containing irregular corrosion cavitations and scattered randomly on the surface, and more deeply especially the second case (fixed samples and corrosive medium is vibratory). Illustrated from the results and carves there was relationship between mentioned corrosion cases, it was an experimental mathematical formula: Acc.C.R.= Vib-C.R2 – ( Vib-C.R1 +Static C.R.)

The Effect of Thermal Loadings on the Dynamic Behavior of Cylindrical – Conical Intersection shell

Muhsan J. Jweeg; Ammar A. Al-Filfily; Ali B. Assi

Volume 27, Issue 4 , March 2009, , Page 831-851

https://doi.org/10.30684/etj.27.4.19

Abstract

This paper presented a numerical methods based on FEM were used to studythe effect of temperature on the dynamic characteristic of composite cylindricalconical shell with different ... Read More ...

Keywords = Vibration

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