By United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
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Extra info for NASA publications manual
1-33 Modified forming limit diagram: (a) major-minor and (b) critical strain bands and index point. strain axes In using the stretch-draw chart, the first parameter, the forming line, determines the material’s capabilities. The end points of the forming line are most easily obtained from the material properties (total elongation and plastic anisotropy) and the equation shown in Fig. 1-35. These material properties are obtainable from a standard tensile test. It has been proven that these end points can be joined by a straight line.
The fabrication labor costs are greatly reduced since there are fewer parts; consequently, less time is expended in fabrication assembly. Both of these factors result in lower costs for the component. It is noted that the greatest benefits of this technology depends on a coupling of the design and manufac- ANALYTICAL turing functions to result in the most efficient structure with the lowest cost. Limitations Superplastic materials do not offer advantages in conventional deep drawing processes under isothermal conditions.
1971. Granzow, Wa”yne G. The Effact of Mechanical Properties on Formability of Low Carbon Steal Sheets. 1975. . Hamilto~, ‘C. ” ‘H. ” Forming of Superplestic Metals. Proceedings of symposium sponsored by the Metallurgical Society of AlME, 1 Q77 Hecker, S. , and Ghosh, A, K. ’” Scientific American (November 1976), pp. 100-108, Hobbs, Robert M. Tha Use of Grid Strain Analysis for Die Development and Process Control in Australian Press Shops. SME Technical Paper MFR77-15, 1977. Irving, Robert R. ” /ron Age (January 14, 1981), pp.