NASA Technical Reports Server NTRS 20150014967: Shape Memory Alloy Rock Splitters SMARS - A Non-Explosive Method for Fracturing Planetary Rocklike Materials and MineralsReportar como inadecuado



 NASA Technical Reports Server NTRS 20150014967: Shape Memory Alloy Rock Splitters SMARS - A Non-Explosive Method for Fracturing Planetary Rocklike Materials and Minerals


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A static rock splitter device based on high-force, high-temperature shape memory alloys HTSMAs was developed for space related applications requiring controlled geologic excavation in planetary bodies such as the Moon, Mars, and near-Earth asteroids. The device, hereafter referred to as the shape memory alloy rock splitter SMARS, consisted of active expanding elements made of Ni50.3Ti29.7Hf20 at.% that generate extremely large forces in response to thermal input. The preshaping training of these elements was accomplished using isothermal, isobaric and cyclic training methods, which resulted in active components capable of generating stresses in excess of 1.5 GPa. The corresponding strains or displacements were also evaluated and were found to be 2 to 3 percent, essential to rock fracturing and-or splitting when placed in a borehole. SMARS performance was evaluated using a test bed consisting of a temperature controller, custom heaters and heater holders, and an enclosure for rock placement and breakage. The SMARS system was evaluated using various rock types including igneous rocks e.g., basalt, quartz, granite and sedimentary rocks e.g., sandstone, limestone.



Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/







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