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D. Mythili,R. Murugesan,S. Christian Johnson 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.4
Concrete has unique properties to make things in any shape. However, the strength of the concrete to support is weakin tension and good in compression. To improve the tension force carrying capacity, the concrete might get some fibrousmaterial as additional reinforcement in concrete. This addition can improve the load-carrying capacity, uniform stress &strain distribution to the entire cross-section, good bonding of ingredients, etc. This research paper deals with glass andbasalt fiber in mono and hybrid form in M30-grade concrete. The glass and basalt fiber of 1.5% volume fraction possessesgood behaviour in mechanical properties tests in mono form. When it is hybridization, 0.75% of each fibers combination hasgood strength in mechanical properties. The compressive strength has been increased up to 11%, tensile strength capacityhas been increased up to 12.5% and the modulus of rupture has been increased by about 17.4% due to the hybridization offibers. Similarly, the static load proves the specimen with fibers has a better resistance against the applied load and has lessdeflection corresponding to the ultimate load. The stress-strain behaviour obeys Hook law. The durability behaviour of theconcrete specimen also has been improved. The performance assessments taken into account for the hybrid fibre reinforcedconcrete mixes are as follows: modulus of rupture, flexural behaviour of beams, split tensile strength, acid, sulphate, andchloride attack resistance. These parameters assess the mechanical and durability properties of the concrete mixes.
Singh Akash,Thirumurugesan R.,Krishnakumar S.,Rani Revati,Chandramouli S.,Parameswaran P.,Mythili R. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
Enhancement of wear resistance of components used in fast reactors is necessary for long service life of the components. Plasma nitriding is a promising surface modification technology to impart high hardness and improved wear resistance of various steel components. This study discusses the characterization of chrome nitrided SS316L casing ring used in secondary sodium pump of fast breeder reactor and its stability under long term sodium exposure. Microstructural and hardness analysis showed that stress relieved component could be chrome nitrided successfully to a thickness of about 100 μm. Assessment of in-sodium performance of the chrome nitrided casing ring subjected to long term exposure up to 5000h at 550°C, showed retention of chrome nitrided layer with a case depth almost similar to that before sodium exposure. A slight decrease in the hardness was observed due to prolonged high temperature sodium exposure. Tribological studies indicate very low coefficient of friction indicating the retention of good wear resistance of the coating even after long term sodium exposure.