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- W2115540153 abstract "Samples of powdered silicates have been sifted in a vacuum chamber at pressures of 10−10, 10−9, and 750 mm Hg. The geometry of the deposit and the force necessary to disrupt it both implied cohesion of particles under high-vacuum conditions. If the attractive forces act only at points of contact in an array of elastic spherical particles, a contact stress of 3 × 108 dynes/cm2 would explain the observed cohesion. If, on the other hand, the forces act over a distance rather than at contact points, then the analysis depends upon a major portion of the surface area being covered by the powder deposit. The cohesion for this case is estimated to be 750 dynes/cm2. These data indicate that lunar surface materials will exhibit an appreciable shear strength, so that disastrously low bearing capacities need not be expected. The lack of adhesion in air, and after contamination of the particles with a monolayer of oil, suggests that van der Waal's forces and/or ionic and covalent bonds rather than gross electrostatic forces are probably responsible for high-vacuum adhesion." @default.
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- W2115540153 date "1964-01-15" @default.
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- W2115540153 title "Adhesive behavior of silicate powders in ultrahigh vacuum" @default.
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- W2115540153 doi "https://doi.org/10.1029/jz069i002p00235" @default.
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