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DTIC ADA285240: Abrasive Properties of Test and Training Site Soils... |
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by Defense Technical Information Center |
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The experiment reported here shows that fine soil |
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particles contribute to abrasion, wear and ultimate |
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failure of parachute materials in a manner somewhat |
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analogous to 'three-body abrasion' in metals. The |
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'hardness' of the particles collected at several test, |
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training and maneuver areas is examined and scaled to |
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known natural materials and commercial abrasives. The |
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geometric diameters of the soil grains that enter and |
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imbed in the fibers are a primary factor for |
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understanding the abrasion mechanism. En the case of |
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cordage abrasion, the fraction of soil grains less than |
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0.2 mm was dominant within the strands and among the |
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fibers. The particles were applied to designated surface |
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grids on relatively large (3 x 3 to 7 x 7 cm) Mohs |
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hardness specimens, glass photographic plates and steel |
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cutting tools. All of the fine particles abraded glass |
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photographic plates, with the exception of a soft, |
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nonmagnetic, black fraction found in Camp Blanding fines. |
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None of the materials scratched corundum, although it was |
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possible to make a few scratches in Topaz with almost all |
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specimens. The general upper limit of hardness was |
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similar to that of quartz, which showed some detectable |
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abrasion by five specimens. Fines from the Riyadh, Saudi |
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Arabia, area easily scratched quartz, and this material |
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is the hardest measured to date. |
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Date Published: 2018-03-20 05:29:36 |
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Identifier: DTIC_ADA285240 |
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Item Size: 14597443 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Hogan, Austin W ; COLD ... |
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