Mechanical Seminars PPT

In this Page you can find Mechanical Seminars PPT for the year 2013.  

Space Elevator

The LEO space elevator is an intermediate version of the Earth surface to GEO space elevator concept, and appears to be feasible today using existing high-strength materials and space technology. It works by placing the system's midpoint station, and center of gravity, in a relatively low-Earth orbit and extending one cable down so that it points toward the center of the Earth and a second cable up so that it points away from the Earth. The bottom end of the lower cable hangs down to just above the Earth's atmosphere such that a future space plane flying up from the Earth's surface would require 2.5 km/sec......... >>>>Read More


Cavitation is the process of formation of vapour bubbles of flowing fluid in a region where the pressure of the liquid falls below its vapour pressure and the sudden collapsing of these vapour bubbles in region of high pressure. At first small vapour filled bubbles are formed that gradually increase in size. As the pressure of the surrounding liquid increases, the cavity suddenly collapses-a centimeter sized cavity collapses in milliseconds. Cavities implode violently and create shock waves that dig pits in exposed metal surfaces.......... >>>>Read More

Thermal shock on interfacial adhesion of thermally conditioned

Thermal stresses were built-up in glass fiber reinforced epoxy composites by up-thermal shock cycles (negative to positive temperature exposure) for different durations and also by down-thermal shock cycles (positive to negative temperature exposure). The concentration of thermal stresses often results in weaker fiber/matrix interface. A degradative effect was observed in both modes for short shock cycles and thereafter, an improvement in shear strength was measured. The effects were shown in two different crosshead speeds during short-beam shear test.......... >>>>Read More

Total Productive Maintenance

Seiichi Nakajima (1988) has defined TPM as an innovative approach to maintenance that optimizes equipment effectiveness, eliminates breakdowns, and promotes autonomous maintenance by operators through day-to-day activities involving the total work force. Thus, TPM is not a specific maintenance policy, it is a culture, a philosophy and a new attitude towards maintenance. The salient features of TPM is the involvement of operators in carrying out autonomous maintenance by participating in cleaning, lubrication, minor repair, adjustments etc. The benefits of TPM can be very tangible. ......... >>>>Read More


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