Year-2012
http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/32
2024-03-28T14:10:42ZThermal wave imaging techniques for inspection of plywood materials
http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/4331
Thermal wave imaging techniques for inspection of plywood materials
Mulaveesala, R.; P Nagarjuna, V.; Ravi, D.; Amarnath, M.
Infrared non-destructive testing and evaluation (IRNDT&E) is an emerging approach for materials characterization due to its capability to test wide variety of solid materials such as metals, composites and semiconductors of industrial interest. Further it supports thorough inspection and evaluation by its unique remote and fast and whole field testing capabilities. Wood is one of the most commonly used house hold building material it has both structural and decorative applications. It is used both in natural and processed form like ply wood, veneer, ply-board etc. Defects like knots, worm track, delaminations, glue smear etc. influences its in-service capabilities. Even though various non-destructive methods such as optical, ultrasonic and radiography are commonly used to inspect wooden materials, infrared imaging has its own advantage due to its safe, whole field inspection capabilities. This paper describes the applicability of the transient thermal wave imaging (TWI) method for inspection of ply wood. This paper highlights applicability of transient pulsed thermal imaging approach for finding out the hidden defects. Capability of the proposed method and its defect detection capabilities have been highlighted through experimental results.
2022-12-22T00:00:00ZEffect of Co-Zr doping in the M-Type barium hexaferrite BaCoxZrxFe(12- 2x)O19: A Möss
http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/4329
Effect of Co-Zr doping in the M-Type barium hexaferrite BaCoxZrxFe(12- 2x)O19: A Möss
Chawla, S.K.; Mudsainiyan, R.K.; Meena, S.S.; Yusuf, S.M.; Singh, N.
M- type hexagonal ferrites BaCoxZrxFe (12-2x)O19 (x = 0, 0.4 & 1.0) have been prepared by a sol-gel route. Mössbauer Spectroscopy is employed to probe the changes in the structural and magnetic properties at the microscopic levels in these Ba-haxaferrites where magnetic (Co2+), and non-magnetic (Zr 4+) ions have been substituted for Fe3+. Structure analysis, by Rietveld refinements of X-ray diffraction patterns, reveals that the substitution is preferred at octahedral 4f2 site up to x = 0.4 dopant concentration whereas, at higher concentration (x ∼ 1.0), Co 2+ ions enter into 4f2 while Zr4+ ions occupy both 4f2 and trigonal bipyramidal 2b (pseudotetrahedral) sites. The maximum substitution was attained at x = 1.0. This study reveals that site preferences depend upon both the nature of dopants and their concentration. The substitution causes a decrease in hyperfine field for all five crystallographic sites.
2022-12-22T00:00:00ZImproving the tribological properties of mg based AZ31 alloy using friction stir processing
http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/4154
Improving the tribological properties of mg based AZ31 alloy using friction stir processing
Arora, H.S.; Singh, H.; Dhindaw, B.K.; Grewal, H.S.
Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Surface metal matrix composites (SMMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Friction stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of SMMCs. Commercial cast or wrought type Mg-Al- Zn AZ-series alloys, such as AZ91, AZ61 or AZ31 with 3-9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Due to low percentage of alloying elements/second phase elements in these alloys, the grain refinement and hence the mechanical properties such as hardness cannot be appreciably enhanced. In this study, FSP was used to fabricate AZ31 based nanocomposite using TiC as reinforcement. FSP was performed at a fixed volume fraction of TiC under varying cooling conditions. Tribological performance of the fabricated composite was investigated using pin-on-disc wear test arrangement. The analysis of the wear surfaces as well as wear debris analysis was done using SEM equipped with EDS. The fabricated composite was found to exhibit superior wear resistance.
2022-11-11T00:00:00ZNon-destructive evaluation of concrete structures by nonstationary thermal wave imaging
http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/3973
Non-destructive evaluation of concrete structures by nonstationary thermal wave imaging
Mulaveesala, R.; Panda, S.S.B.; Mude, R.N.; Amarnath, M.
Reinforced concrete structures (RCS) have potential application in civil engineering and with the advent of nuclear engineering RCS to be capable enough to withstanding a variety of adverse environmental conditions. However, failures/loss of durability of designed structures due to premature reinforcement corrosion of rebar is a major constrain. Growing concern of safety of structure due to pre-mature deterioration has led to a great demand for development of non-destructive and non-contact testing techniques for monitoring and assessing health of RCS. This paper presents an experimental investigation of rebar corrosion by non-stationary thermal wave imaging. Experimental results have been proven, proposed approach is an effective technique for identification of corrosion in rebar in the concrete samples.
2022-09-09T00:00:00Z