Finite strain theory is applied to project the effective elastic coefficients of single-crystal NaCl to 270 kbar. Various two-parameter forms may be fitted to the data, they do not afford a satisfactory general treatment of wave propagation. There remain small but possibly significant discrepancies with the high-precision measurements of linear change at low pressures. (1971) more » gives an equation of state consistent with the pressure-volume measurements to 300 kbar, to within a kilobar or two. (1972a) with the isotherm of Fritz et al. The combination of the values of Spetzler et al. This contains three parameters, of which two, K/sub 0/ and K/sub 0/', are obtainable from single-crystal ultrasonic measurements, while the third, K/sub 0/'', may be found with the aid of shock wave data. A large portion of the data is consistent, to within reasonable uncertainties, with the Eulerian formulation of finite strain, in the BE/sub 2/ form. Ultrasonic, pressuredaggervolume, and shock wave measurements of NaCl are are reviewed, with the purpose of representing as much as possible within a single theoretical framework. On the whole, the data confirm that the structure of Cs-tetra-ferri-annite may be a suitable candidate for the storage of large ions, such as Cs in the interlayer and should be considered as a potential Synroc component. Independent isobaric data on thermal expansion and isothermal compressibility data define the geometric equation of state for Cs-tetra-ferri-annite. Above 450 C in air, Cs-tetra-ferri-annite underwent an oxidation of octahedral iron in the M2cis site, balanced by the loss of H and shown by a decrease of the unit-cell volume. (auth) =, is very small and does not change significantly throughout the P and T range investigated. The isothermal bulk modulus and its first pressure derivative at atmospheric pressure and 28.83/sup 0/C are 664.5 +- 0.5 kbars and 5.40 +- 0.18, respectively, in close agreement with those values ultrasonically measured by R. The above four equations of state also fit closely the Pagannone and Drickamer static compression data, the Christian shock wave data, and the Kormer et al. The Birch's two-parameter equation and the Grover, Getting, and Kennedy equation are indistinguishable more » from the two equations of state derived from the Born model for pressures approximately equal to or less than 800 kbars within +-20 kbars. They are also extrapolated to approximately 5 megabars. Using the Born model of ionic solids, two equations of state were derived both from a power law potential and from an exponential form for the repulsive energy of alkali metal halides and used to fit the pressure-volume data of a LiF single crystal. With the parameters determined, the equations of state are extrapolated to approximately 5 megabars in order to see discrepancies. The computer fit for each equation of state determines not only the value of its parameters but also the standard deviations associated with them and one dependent variable, either pressure or volume. Several two- and three-parameter equations of state were used in analyzing the measured pressure-volume data. The length change was measured with an accuracy of approximately 500 A by using a Fabry Perot type He-Ne laser interferometer for a 1-m long specimen at temperatures constant to less than 0.002/sup 0/C. The most common method used in production is by way of a go/no go gauge.An isothermal equation of state of a LiF single crystal was determined from length change measurements of the specimen as a function of hydrostatic pressure up to approximately 7 kbars at 28 to 41/sup 0/C. Several methods are used to measure the pitch diameter. The pitch diameter is indicated as Dp in the figure shown above. Thread class refers to the acceptable range of pitch diameter for any given thread. Classes 1A, 2A, 3A apply to external threads Classes 1B, 2B, 3B apply to internal threads. The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. It is an interference thread, used on items like spring shackles on an automobile. They are designed to maximize strength considering typical machine shop capability and machine practice.Ĭlass 3 threads are used for closer tolerances.Ĭlass 4 thread fit is even tighter than a Class 3.Ĭlass 5 fit is not a loose thread. This system is analogous to the fits used with assembled parts.Ĭlass 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.Ĭlass 2 threads are the most common. Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw Thread Standard Series. A classification system exists for ease of manufacture and interchangeability of fabricated threaded items.
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