کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8133725 | 1523476 | 2018 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The strength of ice-saturated extraterrestrial rock analogs
ترجمه فارسی عنوان
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کلمات کلیدی
ایکس، خواص مکانیکی، سیارک ها، سطوح، دنباله دار تکنیک های تجربی، ماه، سطح،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
In situ resource utilization (ISRU) activities have been identified by the National Research Council as one of the most important scientific endeavors of the coming decade. The failure of the MUPUS-PEN experiment on Rosetta's Philae lander to penetrate the surface of comet 67P demands knowledge of the mechanical properties of extraterrestrial materials in such environments. To such an end we conducted laboratory strength measurements at cryogenic conditions of two terrestrial rocks, Bishop tuff and Indiana limestone as potential cometary and asteroid analogs, respectively. We measured failure strength of dried and fully saturated samples under constant displacement rate compressional loading at temperatures of 77â¯K-295â¯K and (for most) confining pressure of 5â¯MPa. The strength of saturated samples increased dramatically with decreasing temperature below the ice point: saturated limestone from 30â¯MPa at 295â¯K to >200â¯MPa at 150â¯K and below, and saturated tuff from 26â¯MPa at 240â¯K to 160â¯MPa at 150â¯K. Some ductility or distributed fracturing was evident in both saturated rock types above 150â¯K. The saturated tuff was stronger than pure ice at all conditions but its transition from brittle to ductile deformation with temperature closely paralleled that of ice. The results of this study will be useful to future sample retrieval missions or ISRU maneuvers. The fully saturated state of our samples and use of Bishop tuff as an unconsolidated cometary analog likely means our results are upper estimates for substrates we may encounter in our solar system. Pending corroboration and refinement of these preliminary measurements, the large increase in compressive strength we observed in the saturated materials at cryogenic temperatures suggests that future missions must prepare technology with the energetic and mechanical capability to penetrate very hard substrates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 315, 15 November 2018, Pages 61-68
Journal: Icarus - Volume 315, 15 November 2018, Pages 61-68
نویسندگان
Jared Atkinson, William B. Durham, Sara Seager,