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dc.contributorU.S. Army Natick Soldier Research Development & Engineering Center.-
dc.contributor.authorHogan, Austin W.-
dc.descriptionSpecial Report-
dc.descriptionAbstract: The experiment reported here shows that fine soil particles contribute to abrasion, wear and ultimate failure of parachute materials in a manner somewhat analogous to "three-body abrasion" in metals. The "hardness" of the particles collected at several test, training and maneuver areas is examined and scaled to known natural materials and commercial abrasives. The geometric diameters of the soil grains that enter and imbed in the fibers are a primary factor for understanding the abrasion mechanism. In the case of cordage abrasion, the fraction of soil grains less than 0.2 mm was dominant within the strands and among the fibers. The particles were applied to designated surface grids on relatively large (3 x 3 to 7 x 7 cm) Mohs hardness specimens, glass photographic plates and steel cutting tools. All of the fine particles abraded glass photographic plates, with the exception of a soft, nonmagnetic, black fraction found in Camp Blanding fines. None of the materials scratched corundum, although it was possible to make a few scratches in Topaz with almost all specimens.The general upper limit of hardness was similar to that of quartz, which showed some detectable abrasion by five specimens. Fines from the Riyadh, Saudi Arabia, area easily scratched quartz, and this material is the hardest measured to date.-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesSpecial report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 94-16.-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectTextile fabrics-
dc.subjectParachute wear-
dc.subjectSoil hardness-
dc.titleAbrasive properties of test and training site soils : relative hardness of fine particle fraction-
Appears in Collections:Special Report

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