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By Forest Products Laboratory

Ready by means of wooded area items Laboratory, wooded area provider, U. S. Dept. of Agriculture and through ANC-23 Panel on Sandwich building for airplane, Subcommittee on Air Force-Navy-Civil airplane layout standards, airplane Committee, Munitions Board.

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P. Shaw, “Dislocations Produced in Magnesium Oxide Crystals Due to Contact Pressures Developed by Softer Cones”, Jour. Mater. , 14, 2727 (1989). D. Tabor, The Hardness of Metals, Clarendon Press, Oxford, UK (1951). S. N. Timoshenko and J. N. Goodier, Theory of Elasticity-3rd Edition, p. , New York (1970). J. H. Westbrook, “Flow in Rock-salt Structures”, General Electric Research Laboratory Report #58-RL-2033 (1958), not published. H. Winchell, “The Knoop Microhardness Tester as a Mineralogical Tool”, Amer.

This resistance is determined by the difficulty of shearing one part of the material over another part, and this comes down to the shearing of atoms over one another. To shear one atom relative to others requires the chemical bonds across the shear plane to be rearranged. If the bonding is localized, as it is in the case of electron-pair bonding, individual bonds must actually be broken and then reformed during shearing. If the bonding is not localized as in ionic crystals, and metals, shearing will still disturb it, creating resistance to the shear.

However, the latter continually increases as x increases because of deformation hardening. During each increment, the “yield” stress, Y, starts at the initial yield stress, Y0, and increases until deformationhardening increases it up to Y* (the “saturation” value). Thus the work applied to the indenter during each increment increases until it equals the energy dissipated by the plastic deformation increment. Then no further penetration WHAT DOES INDENTATION HARDNESS MEASURE? 5 deg. 5 Schematic incremental indentation by a conical indenter.

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