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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.
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.
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