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RISS 인기검색어
- 검색키워드
- 저자 : Basil Darras (검색결과 4 건)
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Power Consumption and Tool Wear Assessment when Machining Titanium Alloys
Salman Pervaiz,Ibrahim Deiab,Basil Darras 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.6
Titanium alloys are of interest for aerospace industries due to their high strength to weight ratio, outstanding corrosion and erosion properties and ability to operate at higher temperature. They are classified as difficult to cut materials because of their low thermal conductivity, high chemical reactivity and high strength at elevated temperature. The machinability rating of titanium alloys is low compared to other materials from many aspects. This study focuses on studying the cutting tool wear and power consumption when machining Titanium alloys under different cutting conditions. Design of experiments was used to develop a test matrix that cover the range of cutting conditions recommended for machining titanium alloys. Cutting forces, power consumption, tool wear and surface roughness were measured and analyzed. Tool wear mechanisms were also studied using scanning electron microscopy.
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Evaluation of Welding Processes Based on Multi-dimensional Sustainability Assessment Model
Mohammed H. Saad,Basil M. Darras,Mohammad A. Nazzal 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.1
Welding is a widely used manufacturing process that has a significant impact on the sustainability dimensions represented by environmental, economic and social aspects. In this work, a general and comprehensive framework for sustainability assessment of manufacturing processes is applied to select the most sustainable welding process among several alternatives for a certain application. The considered alternatives are friction stir welding (FSW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW). The four processes are used to weld two aluminum plates. Relevant sustainability indicators are selected from all sustainability dimensions. A dimension for physical performance of the welded parts is also considered. Entropy weight method is used for assigning weights to the indicators to avoid uncertainties of subjective weighting. Three multi-criteria decision making methods (MCDM) are used for normalization and aggregation of data. The reliability of the results is investigated by conducting sensitivity analysis. The results of the study show that FSW is the most sustainable welding process for this study.
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Aser Alaa Ahmed,Mohammad A. Nazzal,Basil M. Darras 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3
Industrialization has brought wealth, prosperity, and abundance to many nations. However, it has had many drawbacks on people’s health and the environment. Several paradigms have been proposed and implemented in an eff ort to suppress and reverse the adverse impacts of human activities and industrialization. A popular approach that serves as a solution to many of the negative implications of industry today is the circular economy (CE). With today’s top-notch technologies, the transition from the conventional linear economy to CE has been made easier. For example, the implementation of cyber-physical systems (CPSs), an Industry 4.0 (I4.0) tool, within a CE can substantially increase efficiency and reduce waste. This work presents a thorough review on the applications of cyber-physical systems within each of the CE stages, the contribution of different CPS technologies to the sustainable development goals (SDGs), and the current state of the CE assessment tools. The contribution of different CPS tools to each CE stage is demonstrated through several practical examples. In addition, this work reveals how the different CPS technologies applications contribute to the attainment of different SDGs set by the United Nations. It is also deduced from the review of the current state of the CE assessment tools that there is a need for a standardized comprehensive CE measuring or rating system to allow businesses on the micro, meso, and macro levels of the economy improve their circulatory.
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Mohammed H. Saad,Mohammad A. Nazzal,Basil M. Darras 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.3
Corporate Sustainability is becoming a key priority for many organizations. Yet, the sustainability rating systems currently used are under intense debate due to the lack of interdependency and standardization, and the presence of subjectivity and financial biases. Here, a sustainability rating tool for manufacturing organizations is developed based on a comprehensive sustainability assessment framework to overcome the aforementioned shortcomings. The framework provides guidance for selecting and quantifying the relevant sustainability indicators that contribute to the Sustainable Development Goals. Objective and subjective weighting methods of sustainability indicators are used to minimize uncertainties linked to pure subjective weighting methods. Interactions and interdependencies among different indicators are captured using Multi Criterion Decision Making Methods. The outcome is a sustainability leaf rating system based on statistical benchmarking approach. The rating system is used to evaluate the sustainability performance of each organization relative to its peers and acts as a baseline for enterprise sustainability performance improvement. A case study is conducted to validate the applicability of the proposed sustainability rating tool. Results show that the rating tool is capable of evaluating the sustainability performance of different organizations in the same industry.
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