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RISS 인기검색어
- 검색키워드
- 저자 : Rehman Mudassar (검색결과 4 건)
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Mudassar Rehman,Sarmad Ali Khan,Rakhshanda Naveed 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7
DC53 is considered as superior steel grade by die and mold making industries as compared to D2 and D3 steel due to its excellent mechanical characteristics like high hardness, wear resistance and strength. DC53 steel finds applications in making stamping dies, punches and cutting tools. In wire electric discharge machining (WEDM) process, gamma phase coated wire offers superior machining performance over uncoated brass and zinc coated electrode wires. This work was performed to study the effect of machining variables like sparks on duration, sparks off duration, arc-on time, and servo voltage on response variables, namely kerf width (KW), cutting speed (CS), material removal rate (MRR), and surface roughness (R a ) for WEDM of DC53 steel. Taguchi L18 orthogonal array was used for experimental design. Analysis of variance showed that sparks on duration is the most significant factor affecting KW, CS, and MRR with percentage contribution of 48.25 %, 80.21 %, and 45.21 %, respectively. Optimal set of machining parameters resulted in 14.02 % improvement in MRR and 19.24 % reduction in workpiece surface roughness. Moreover, gamma phase coated wire was found to have 30-35 % faster cutting rate as compared to uncoated brass wire.
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Kashif Ishfaq,Mudassar Rehman,Yanen Wang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Innovations in the manufacturing industries assist to improve machinability of difficult to cut materials, such as nickel superalloys. Critical applications of these materials require improved dimensional accuracy. These requirements justify the use of electric discharge machining (EDM); however, conventional dielectric poses various health concerns, such as breathing issues. Therefore, the potential of powder mixed biodegradable dielectric is comprehensively investigated herein to improve the geometric accuracy of the machined cavity because it is still plagued by overcut/undercut problems. In this work, the performance of four electrode types (ET), namely aluminum, brass, copper, and graphite along with varying powder concentrations (Cp) was deeply examined under canola oil biodegradable dielectric in the context of axial/lateral overcuts (AOC, LOC). The experimentation resulted in minimum AOC (0.279 mm) and LOC (0.276 mm) at [Cp (0.0 g/100 ml), ET1 (Al)], and [Cp (1.0 g/100 ml), ET4 (Cu)]. The composite desirability-based optimized settings including graphite at higher Cp (1.0, 1.5) caused a percent reduction of 9.10 % and 6.89 % for AOC and LOC, respectively.
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Yanen Wang,Jakiya Sultana,Ammar Ahmed,Ali Azam,Ray Tahir Mushtaq,Mudassar Rehman 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
The development of bamboo fibre (BF) reinforced poly lactic acid (PLA) BF-PLA composites has been growing fast among the natural fibre reinforced composites (NFRCs) over the past few years. BF-PLA composites have gained significant interest as sustainable alternative materials for the engineering and industrial sectors. BF-PLA composites are getting popular due to their remarkable features such as eco-friendliness, biodegradability, recyclability, low cost, low specific weight, and improved mechanical and thermal properties. In this paper, a schematic review of the BF-PLA composites was conducted in terms of mechanical properties (i.e., tensile properties, flexural properties, and impact strength), thermal characteristics with and without chemical treatment, and creep behaviour. Moreover, the sustainability aspects, including biodegradability and recyclability of BF-PLA composites, have been discussed based on various manufacturing methods. In addition, the utilization of BF-PLA composites in the additive manufacturing industry, sustainable packaging, structural, dielectric, and automotive applications are also described to make elevations toward future research and industrial implementations or commercialization. Furthermore, the effects of 3D printing parameters on the mechanical and physical properties of printed BF-PLA objects have been summarized. Significantly, this paper highlights the limitations and future perspectives of the BF-PLA composites.
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Ahmed Ammar,Azam Ali,Wang Yanen,Zhang Zutao,Li Ning,Jia Changyuan,Mushtaq Ray Tahir,Rehman Mudassar,Gueye Thierno,Shahid Muhammad Bilal,Basit Ali Wajid 나노기술연구협의회 2021 Nano Convergence Vol.8 No.37
Additively manufactured nano-MEH systems are widely used to harvest energy from renewable and sustainable energy sources such as wind, ocean, sunlight, raindrops, and ambient vibrations. A comprehensive study focusing on in-depth technology evolution, applications, problems, and future trends of specifically 3D printed nano-MEH systems with an energy point of view is rarely conducted. Therefore, this paper looks into the state-of-the-art technologies, energy harvesting sources/methods, performance, implementations, emerging applications, potential challenges, and future perspectives of additively manufactured nano-mechanical energy harvesting (3DP-NMEH) systems. The prevailing challenges concerning renewable energy harvesting capacities, optimal energy scavenging, power management, material functionalization, sustainable prototyping strategies, new materials, commercialization, and hybridization are discussed. A novel solution is proposed for renewable energy generation and medicinal purposes based on the sustainable utilization of recyclable municipal and medical waste generated during the COVID-19 pandemic. Finally, recommendations for future research are presented concerning the cutting-edge issues hurdling the optimal exploitation of renewable energy resources through NMEHs. China and the USA are the most significant leading forces in enhancing 3DP-NMEH technology, with more than 75% contributions collectively. The reported output energy capacities of additively manufactured nano-MEH systems were 0.5–32 mW, 0.0002–45.6 mW, and 0.3–4.67 mW for electromagnetic, piezoelectric, and triboelectric nanogenerators, respectively. The optimal strategies and techniques to enhance these energy capacities are compiled in this paper. Graphical Abstract
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