This present study deals with the fabrication of aluminium/boron carbide metal matrix composite and investigation on its tribological behavior. The composite incorporated with 5 wt% of boron carbide particles with an average size 33μmwas fabricated through stir casting process. The microstructure of this composite was examined and uniform distribution of reinforced particles in the matrix was observed. Wear experiments were conducted on pin-on-disc tester based on Taguchi's L 27 orthogonal array using three process parameters such as applied load, sliding velocity and distance; each varied for three levels. Loads of 10 N, 20 N, 30 N; velocities of 1 m/s, 2 m/s, 3 m/s and distances of 1000 m, 1500 m, 2000 m were considered for analyzing the wear behavior of composite. Optimum parameters were found out using Signal-to-Noise ratio by choosing 'Smaller-the-better' characteristics for wear rate and coefficient of friction. Influence of individual parameter and their interactions on the responses was predicted using Analysis of Variance. Results depicted that both wear rate and coefficient of friction increases with load and decreases with velocity and distance. Worn out surfaces of the composite specimen were analyzed using Scanning Electron Microscope for predicting the wear mechanism. It was observed that, severe delamination occurred as applied load increased from 10 N to 30 N. This tribological analysis can be utilized to replace the conventional automotive materials with aluminium metal matrix composites having better wear characteristics.
The development of testes occurs in the abdomen during fetal life, after which they migrate into the scrotal sacs during the third trimester. During their descent, they may get arrested anywhere along the tract. Risk of testicular cancer is higher in patients with undescended testes, abdominal testis being more prone than inguinal. Seminoma is the commonest cancer in undescended testis. However, synchronous seminoma involving bilateral cryptorchid testis is rare. Present case is uncommon due to synchronous involvement of abdominopelvic and inguinal testes in extended age. It also exhibited unusual morphology with marked heterogeneity grossly as well as microscopically, instead of a common homogenous appearance.
The software package described here deals with the assessment of damage inflicted by missiles carrying prefragmented, bomblet, incendiary, runway-denial penetration submunition (RDPS), smart munition, and terminally guided submunition warhead. The targets to be neutralised could be static, semistatic or mobile, like runways, bridges, bunkers, armoured tanks, soft-skinned vehicles, and personnel. This is graphical user interface(GUI)-based software, where the user can specify the target dimensions, target types, the number of missiles, its aim point, the type of warhead and the mode of operation. The software gives the number of targets that have been neutralised effectively, as the output. This GUI-based software has been developed using Microsoft Visual Basic, Version 6.0.
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