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Nature of simultaneous processes in plastic deformation

Description: The nature of two simultaneous processes is analyzed in detail. It is found that the experimental activation enthalpy increases with temperature for parallel processes and decreases with temperature for consecutive processes. Similarly the activation volume increases with pressure for consecutive processes and decreases with pressure for parallel processes. The creep rate stress exponent increases with stress for parallel processes and decreases with stress for consecutive processes. Each activation parameter is the weighted average of the corresponding ones for the individual processes. Several ways are indicated for the determination of individual activation parameters. The nature of three and four simultaneous processes is discussed briefly. When several processes are operating simultaneously, one of them may be rate controlling under certain conditions. This rate-controlling process may change with deformation parameters and a transition'' can be defined. The relation between transition parameters and the construction of deformation mechenism diagrams are also discussed. (auth)
Date: January 1, 1972
Creator: Li, J.C.M.
Partner: UNT Libraries Government Documents Department

Adsorption on zirconium oxide

Description: No Description Available.
Date: January 1, 1972
Creator: Holmes, H. F.; Fuller, E. L., Jr. & Beh, R. A.
Partner: UNT Libraries Government Documents Department

Pressure vessel reliability as a function of allowable stress

Description: From Winter meeting of American Society of Mechanical Engineers; Detroit, Michigan, USA (11 Nov 1973). The probability of failure corresponding to specified levels of allowable design stress was calculated for pressure vessels designed in accordance with the ASME Boiler and Pressure Vessel Code. The analysis was performed for maximum shear stress failure and for cyclic stress failure. The significance of such failure prediction is ddscussed and a rationale for selecting an allowable stress is presented. Examples are presented that demonstrate the estimation of vessel failure probability as a function of load variation, strength variation, and design safety factor. (auth)
Date: January 1, 1972
Creator: Arnold, H.G.
Partner: UNT Libraries Government Documents Department