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Murali, S.
- A Study on Tribological Behavior of AZ31bMg Composite
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Authors
Affiliations
1 Mechanical Engineering, Vels University, Chennai - 600117, Tamil Nadu, IN
1 Mechanical Engineering, Vels University, Chennai - 600117, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 43 (2016), Pagination:Abstract
Objectives: To analyse the wear behavior of AZ31bMg composite under vacuum and atmospheric conditions. Methods/ Statistical Analysis: The wear test is performed in vacuum and atmosphere at elevated temperature by varying the load and sliding distance based on pin- on - disc configuration using oil hardened steel as a counter face. Wear is measured in terms of weight loss using digital balance with an accuracy of 0.0001 g. The Micro structural study is carried out at the worn surface of the specimen. Then the results of vacuum and atmosphere testing are compared. Findings: From the study, it is observed that the wear (weight loss) increases with an increase in load and sliding distance. The same trend is observed when the specimen is tested at elevated temperature; wear rate increased with increase in temperature and it is due to softening of material on contact surfaces. And it is also found that the wear rate of specimen is increased when it is tested in a vacuum. Also, due to partial melted phases covering the pin surface, the weight loss of the specimen decreases with increase in vacuum. Wear debris was found on the surfaces of pin specimen. The Micro structural study is carried out at the worn surface of the pin specimen. The comparison of results indicated that there was a difference in wear behavior in different environments, and AZ31bMg composite could be considered as an excellent material at low temperature and high vacuum condition applications where high strength, less weight and wear resistance are of prime importance. Application/Improvements: The scope of tribology has become increased to embrace numerous areas such as aerospace, computing, micro mechanics and microelectronics. This in turn opens a broad scope for analyzing friction and wear.Keywords
AZ31bMg Composite, Pin-On-Disc, Tribological Behavior, Tribometer, Wear Behavior.Full Text
- Vertical Assessment of Soil Quality In Permanent Manurial Experiment of Dryland Ecosystem, Tamil Nadu, India
Abstract Views :87 |
PDF Views:57
Authors
V. Venkatesh
1,
N. Chandra Sekaran
1,
V. Sanjivkumar
1,
S. Meena
1,
K. T. Parthiban
2,
B. Balaganesh
3,
K. Subash Chandra Bose
1,
S. Murali
1
Affiliations
1 Tamil Nadu Agricultural University (TNAU), Coimbatore 641 003, India., IN
2 Forest College and Research Institute, TNAU, Mettupalayam 641 301, India., IN
3 School of Agricultural Sciences, Karunya University, Coimbatore 641 114, India., IN
1 Tamil Nadu Agricultural University (TNAU), Coimbatore 641 003, India., IN
2 Forest College and Research Institute, TNAU, Mettupalayam 641 301, India., IN
3 School of Agricultural Sciences, Karunya University, Coimbatore 641 114, India., IN
Source
Current Science, Vol 124, No 11 (2023), Pagination: 1308-1318Abstract
A study was conducted to assess the impact of different nutrient management practices on soil quality in a permanent manurial experiment cotton field established in 1982 at the Agriculture Research Station of the Tamil Nadu Agricultural University, which falls under the dryland ecosystem of Kovilpatti in Tamil Nadu, India. The experiment was carried out in a randomized block design with nine different treatments. The effect of these treatments in different depths (0–15, 15–30 and 30–45 cm) was compared, and the soil quality index was developed with a total of 27 parameters, including physical, chemical and biological parameters. Principal component analysis was carried out and the principal components with eigenvalue >1 were selected to determine the indicators to be retained in the minimum dataset. The highly weighted variables, viz. field capacity, available water content, cation exchange capacity, nitrogen, phosphorus, potassium, calcium, magnesium, etc. with a variance of 93.57% were retained for MDS. Linear scoring functions were used to transform them into unitless scores ranging from 0 to 1. Three different methods of soil quality were analysed, viz. weighed additive soil quality index (SQIw), additive soil quality index (SQIa) and Nemoro soil quality index (SQIn). In all three methods, the treatment receiving farmyard manure at 12.5 t ha–1 showed superiority in maintaining soil qualityKeywords
Cotton, Dryland Ecosystem, Nutrient Management Practices, Permanent Manurial Experiment, Soil Quality Index.Full Text
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