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91.
Yarn structure influences the configuration of the constituent fibers in the yarn and the comfort properties of the fabrics to a great extent. The fiber arrangement in the yarn has a major influence on the comfort-related properties such as thermal conductivity, air permeability, wickability, and moisture vapor permeability. This study dealt with the influence of process and material variables namely, polyvinyl alcohol (PVA) proportion, twist multiplier (TM), and spindle speed on microporous viscose yarn properties. Three-variable three-factor Box and Behnken method was used to investigate the individual and interaction effects of selected variables on yarn properties. The selected variables have a significant influence on all the yarn properties. The increase in PVA%, spindle speed, and TM reduces the specific volume and wickability of yarns and increases the tenacity and packing factor of yarns before dissolving the PVA fibers. With increase in spindle speed and TM, same trend was noticed after dissolving the PVA also. But the trend reverses with increase in PVA percentage after dissolution of PVA fiber. The increase in PVA percentage increases the specific volume and wickability of yarns and decreases the tenacity and packing factor of yarns after dissolution of PVA fiber. The optimized process parameters were obtained, and yarn was spun with the optimized parameters to validate the model. 相似文献
92.
M. Joseph Fernandus T. Senthilkumar V. Balasubramanian S. Rajakumar 《Journal of Materials Engineering and Performance》2012,21(11):2303-2315
The main difficulty when joining magnesium (Mg) and aluminum (Al) alloys by fusion welding lies in the formation of oxide films and brittle intermetallic in the bond region which affects the integrity of the joints. However, diffusion bonding is a suitable process to join these two materials as no such characteristic defects are produced at the joints. The diffusion bonding process parameters such as bonding temperature, bonding pressure, holding time, and surface roughness of the specimen play a major role in determining the joint strength. In this investigation, an attempt was made to develop empirical relationships to predict the strengths of diffusion bonded AZ80 magnesium and AA6061 aluminum alloys dissimilar joints from the process parameters based on central composite factorial design. Response surface methodology was applied to optimize the process parameters to attain the maximum shear strength and bonding strength of the joint. From this investigation, it was found that the bonds produced with the temperature of 405.87?°C, pressure of 7.87?MPa, holding time of 29.02?min and surface roughness of 0.10???m exhibited maximum shear strength and bonding strength of 57.70 and 76.90?MPa, respectively. The intermetallic formation at the interface was identified. 相似文献
93.
V.D. Nithya R. Jacob Immanuel S.T. Senthilkumar C. Sanjeeviraja I. Perelshtein D. Zitoun R. Kalai Selvan 《Materials Research Bulletin》2012,47(8):1861-1868
The structural, electrical and magnetic properties of LaCr0.5M0.5O3 (M = Cr3+, Cu2+ and Fe3+) synthesized by a sol–gel technique were studied. The X-ray diffraction pattern shows the structure to be orthorhombic and the size of the particles is around 100 nm as seen from the TEM images. The effects of Cu2+ and Fe3+ on the electrical properties of LaCrO3 were studied using impedance spectroscopy at room temperature (RT). The properties of LaCr0.5Cu0.5O3 were studied over a wide range of temperature from RT to 533 K. A maximum conductivity of 1.7 × 10?3 S cm?1 was observed for LaCr0.5Cu0.5O3 at a measured temperature of 533 K. The impedance spectra indicate a negative temperature coefficient of resistance (NTCR) and also imply the conduction is through bulk of the material. The magnetic studies performed using a SQUID magnetometer interpret the antiferromagnetically ordered LaCrO3 to behave ferromagnetically on the addition of Cu2+ and Fe3+, and the magnetization was found to be enhanced in the LaCr0.5Fe0.5O3. 相似文献
94.
95.
R. Narayanasamy V. Senthilkumar K. S. Pandey 《International Journal of Mechanics and Materials in Design》2006,3(1):39-57
Workability is concerned with the extent to which a material can be deformed in a specific metal working process without the
initiation of cracks. Ductile fracture is the most common failure in bulk forming process. The formability is a complicated
phenomenon which depends on the friction between the preform and the die surface in cold upsetting. A complete experimental
investigation on the workability behavior of the steel composite of 4%TiC was performed under different stress states, namely,
plane and triaxial stress state conditions. Cold upsetting of the Fe–1.0%C–4%Ti steel composite preforms was carried out applying
different lubricants, namely, graphite, zinc stearate and molybdenum disulphide, and without lubricant, and the formability
behaviour of the same under plane and triaxial stress state conditions was determined. The curves plotted for different preforms
were analysed and relationship was established between the axial strain and the formability stress index under plane and triaxial
state conditions. A relationship between the relative density and the axial strain was also established. Various stress ratio
parameters, namely, (σθ/σeff), (σm/σeff) and (σz/σeff), under plane and triaxial stress state conditions were determined empirically as a function of the relative density. An
attempt is also made to study the variation of slope of the relative density versus stress ratio parameters under plane and
triaxial stress conditions with respect to the relative density to identify the pore closure mechanism. 相似文献
96.
The influence of cryogenic treatment on the wear resistance of En 19 steel was studied. Furthermore, a comparative analysis on the effect of Deep Cryogenic Treatment (DCT, -196 ℃×24 h), Shallow Cryogenic Treatment (SCT, -80 ℃×5 h) and Conventional Heat Treatment (CHT) was done through dry sliding wear testing. The microstructures of CHT, SCT and DCT samples were also examined through scanning electron microscopy. The results indicated that the wear resistance of shallow and deep cryogenically treated samples is higher when compared to that of conventionally treated samples. X-ray diffraction pattern revealed that the transformation of retained austenite into martensite is responsible for the wear resistance improvement. 相似文献
97.
A. Mano Priya R. Kalai Selvan B. Senthilkumar M.K. Satheeshkumar C. Sanjeeviraja 《Ceramics International》2011,37(7):2485-2488
The CdWO4 nanocrystals were successfully synthesized by simple co-precipitation method. The X-ray diffraction pattern confirms the phase purity and the single phase formation of monoclinic Wolframite structure of CdWO4. The average crystallite size of 22 nm was calculated from X-ray line broadening method. The FT-IR spectra confirm the presence of stretching and bending vibrations of metal cations like Cd-O, W-O and Cd-O-W bands in the CdWO4 structure. The morphological features were analyzed by TEM and HRTEM techniques. The electrical conductivity of the materials is found to increase with increasing temperature as well as frequency which enumerates the semiconducting behavior of the material. 相似文献
98.
99.
100.
M. Chandrasekar S. Suresh T. Senthilkumar 《Renewable & Sustainable Energy Reviews》2012,16(6):3917-3938
Experimental investigations on thermophysical properties and forced convective heat transfer characteristics of various nanofluids are reviewed and the mechanisms proposed for the alteration in their values or characteristics due to the addition of nanoparticles are summarized in this review. A comprehensive review on the experimental works on specific application of nanofluids is also presented. As the literature in this area is spread over a span of two decades, this review could be useful for researchers to have an accurate screening of wide range of experimental investigations on thermophysical properties, forced convective heat transfer characteristics, the mechanisms involved and applications of various nanofluids. 相似文献