In this work, an innovative nanocutting fluid, based on coconut oil was developed by dispersing silver nanoparticles (AgNPs) of size less than 50 nm. The tribological and physical properties of the prepared nanocutting fluid with different volumes of silver nanoparticles were studied. It was found that the addition of 4% by volume of nanoparticles enhanced the properties of the nanocutting fluid compared to the other concentrations studied, thus demonstrating its excellent tribological performance. The effect of the newly developed nanocutting fluid with 4% of silver nanoparticles on cutting performance was also investigated while machining AISI4340 steel with minimal fluid application. Results revealed that the cutting force, cutting temperature, and tool wear are reduced on an average by 22.6%, 12.6%, and 5.3% respectively. It was evident that efficient cooling and lubrication of nanocutting fluid dispersed with silver nanoparticles improved the cutting performance. The outcomes of this work can be considered as a development toward eco-friendly and sustainable machining.
Composites are composed of two or more physically distinct phases whose combination produces aggregate properties. Ethiopia is very rich in natural fibers such as palm trees, sisal, water hyacinth, and newly formed water lilies. However, so far little attention has been paid to the study of the mechanical properties of most fiber composites, such as water lily cut fiber composites. Also, like water hyacinths, water lilies adversely affect water surfaces by covering them and reducing water content, as in Lake Tana in Ethiopia. The analysis of the mechanical properties of this reinforced composite is of great importance in the study of structural properties and industrial production. Mechanical properties such as tensile strength, flexural strength, and hardness properties are important factors and play a key role in determining those properties. In this publication, fiber-reinforced polyester resin composites were prepared by cutting water lilies by varying the weight concentration of fibers (20 F/80 wt%, 40 F/60 wt%, 60 F/ 40P wt%). Physical properties were evaluated according to ASTM standards in both tensile and bend tests. Experimental test results are validated with results obtained by analytical methods. Analytical techniques such as the law of mixtures and the geometric mean method have been used to evaluate the properties of composite materials. Experimental results show that shredded water lily fiber-reinforced polyester composites are suitable for various applications. The results show that the newly formed composites have harder and more brittle properties.
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