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Al-Obaidi A.,TU Chemnitz | Al-Obaidi A.,Technical College Baghdad | Krausel V.,TU Chemnitz | Landgrebe D.,Fraunhofer Institute for Machine Tools and Forming Technology
International Journal of Advanced Manufacturing Technology | Year: 2015

High-strength sheet metal materials are hardly formed by conventional single-point incremental forming; the formed parts produced using this process exhibit decreased geometrical accuracy and low formability values. In the present study, a new process is investigated for hot single-point incremental forming. The method was simplified by combining incremental sheet metal forming on the front side of the sheet and induction heating on the backside of the sheet. The process setup was based on elementary tooling; it utilizes synchronized movement of the tool with the inductor. The locally heated zone allows smooth forming of advanced high-strength steels. The appropriate heating rate was controlled by optimizing the correct relationships between the process variables by using DC04 as a reference material for comparison. The process variables affecting the operation have been investigated and are the step size, induction power, and feed rate. This method has been tested and successfully improved. The results show that the formability improved and that the residual stress of DP 980 steel decreased. On the other hand, it was possible to diminish the springback and to increase the geometrical accuracy for 22MnB5 steel. Furthermore, a major reduction of the forming forces was noticed while incremental forming was performed and supported by induction heating. The significant results demonstrated a method to solve the forming problems of high-strength metals by induction heating at forming. © 2015 Springer-Verlag London

Zhang H.,Shandong University of Technology | Abed F.H.,Technical College Baghdad
Environmental Engineering and Management Journal | Year: 2013

The Iraqi Marshlands, the largest wetland in the Middle East and one of the most outstanding in the world have been lost mainly as result of drainage and damming. This study analyzed the dynamics of land use/cover change in Iraqi Marshlands Region from 1973 to 2011. In this process, we established the land use/cover classification system and remote sensing interpretation characteristics. A laminar extraction technique was used in the identification of typical attributes of land use/cover types. The results showed that the Marshlands region had been subject to much change. This resulted from direct and indirect impacts of human activities. The direct impacts, resulting in marsh loss were associated with drainage of wetlands and diversion of water supplies for agricultural purposes and for military reasons. The marsh ecosystem maws degraded due to indirect impacts arising from alterations to the marsh hydrology.

Muhsin J.J.,Nahrain University | Tolephih M.H.,Technical College Baghdad | Muhammed A.M.,Nahrain University
ARPN Journal of Engineering and Applied Sciences | Year: 2012

Three-dimensional nonlinear thermal numerical simulations are conducted for the friction stir welding (FSW) of AA 7020-T53. Three welding cases with tool (rotational and travel) speeds of 900rpm-40mm/min, 1400rpm-16mm/min and 1400rpm-40mm/in are analyzed. The objective is to study the variation of transient temperature in a friction stir welded plate of 5mm workpiece thickness. Based on the experimental records of transient temperature at several specific locations during the friction stir welding process for the AA 7020-T53, thermal numerical simulation is developed. The numerical results show that the temperature field in the FSW process is symmetrically distributed with respect to the welding line, increasing travel speed decreasing transient temperature distribution and increasing rotational speed increase temperature distribution. Experimental data illustrates that peak temperatures are higher on the advancing side than the retreating side. Comparison with the temperature measured by the thermocouples records shows that the results from the present numerical simulation have good agreement with the test data. © 2006-2012 Asian Research Publishing Network (ARPN).

Chong A.K.,University of Southern Queensland | Al-Baghdadi J.A.A.,Technical College Baghdad
IEEE ICSIPA 2013 - IEEE International Conference on Signal and Image Processing Applications | Year: 2013

Recently, off-the-shelf HD video cameras are recognized low-cost video capture for the study of human movements associating with sport training, sport performance evaluation, physical impairment evaluation and rehabilitation evaluation. The data required for these applications are usually dimensions, 3D distance, angular elements and speed of movement of the various body components such as the head, trunk and limbs. More complex data include isoline plots, profile and cross-section and 3D textured models of these body parts. This paper focuses on the developed techniques that are used for acquiring high accuracy data for these applications. In the paper, the results of three current case studies are provided to show the quality of the videogrammetric acquired data. The studies show that the techniques developed produce high accuracy data for various applications in movement research. © 2013 IEEE.

Al-Baghdadi J.A.A.,Technical College Baghdad | Chong A.K.,University of Southern Queensland | Milburn P.,Griffith University | Newsham-West R.,Griffith University
IEEE ICSIPA 2013 - IEEE International Conference on Signal and Image Processing Applications | Year: 2013

The intensity of research to study the functioning of the human foot and the body-weight loading impact on its performance has increased considerably in the last five years. This type of research is particularly important for injured or deformed foot. Low-cost HD video cameras are becoming popular for capturing accurate three-dimensional (3D) model of the human body parts and they have shown to be useful for the study of the human foot during walking. A research was carried out to determine whether continuous capture of the 3D models of the foot during walking can assist in the understanding of the loading characteristics of the foot. This paper provides discussion on the methods used to correlate the video-captured 3D model of the foot and the force plate recording of the foot-loading during walking. The discussion covers the test methods and the results of the study. The studies show that the techniques developed produce precise correlation between foot loading and the video-captured 3D models and these data could be used for the mentioned applications. © 2013 IEEE.

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