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Current
Research Projects |
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Design
of a High Friction Clamping Interface |
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Sudipta
Chaterjee |
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Design a
high friction interface with an adaptive superelastic NiTi coating.
Currently, MEMS technology can machine the microstructure of many surfaces.
By further exploring the realm of macro and micro tribology custom made
surfaces can be designed to provide high or low friction. Typically
surfaces with high friction also have a high wear rate. With the use
of a polished bulk sample of superelastic NiTi a coefficient of friction
> 1 has been proven with negligible wear. Modifications have to be
made to micromachining of the steel clamps in order to provide a clamping
interface that can be used on surfaces with a NiTi coating. |
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MEMS
Passive Valve |
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Dong-gun
Lee |
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Development
of a micromachined passive check valve for a SMA based actuator used
in a compact kinetic energy missile. The overall diameter of the valve
is 12 mm and the thickness is 1mm. The structure is designed such that
one valve unit houses an array of 84 micro check valves. Each microvalve
has a 100µm orifice diameter covered by a 20µm thick nickel
flap. This design allows the flaps to withstand high-pressure gradient
created by the actuator while achieving high flow rates with array of
micro valves. |
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Sputter
Deposition of NiTi Shape Memory Alloys |
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Mohanchandra
K.P. |
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As
the development of miniaturization in modern technology proceeds, great
attention is being paid to thin film shape memory alloys because they
are useful as micro actuators in integrated microelectronic mechanical
systems (MEMS). Thin films of binary and ternary shape memory alloys
are produced using a DC magnetron sputtering. Different types of substrates
and targets with different compositions are used for the deposition
of films. A new process parameter viz:, hot target, is being used to
produce shape memory films. These films, characterized by XRD, TEM,
DSC and Four Point Probe, are later used in the fabrication of micro-valves,
a micro-pump and micro-gripper. |
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