Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aeme.symp..167j&link_type=abstract
In NASA. Johnson Space Center, The 29th Aerospace Mechanisms Symposium p 167-171 (SEE N95-27260 09-15)
Physics
Actuators, Electromechanical Devices, Mars Exploration, Robot Arms, Shape Memory Alloys, Space Exploration, Wire, Crystallinity, Mars Environment, Nickel Alloys, Nitinol Alloys, Technology Utilization, Titanium Alloys
Scientific paper
NASA's Mars Pathfinder mission, to be launched in 1996, reflects a new philosophy of exploiting new technologies to reduce mission cost and accelerate the pace of space exploration. One of the experiments on board Pathfinder will demonstrate the first use in space of a multi-cycle, electrically-activated, shape-memory alloy (SMA) actuator. SMA's are metal alloys which, when heated, undergo a crystalline phase change. This change in phase alters the alloy lattice-constant, resulting in a change of dimension. Upon cooling, the alloy returns to its original lattice formation. Wire drawn from an SMA contracts in length when heated. The reversible change in length is 3 percent to 5 percent. The wire used in this actuator is a nickel-titanium alloy known as nitinol.
Jenkins Phillip P.
Landis Geoffrey A.
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