Practical Application of Stress Strain Theory

THE first and foremost problem in aircraft production is one of proper design and rapid production of sheet metal forming tools. A full understanding of forming properties of various aircraft materials, the limits of each method of forming, and die design and construction, are of vital importance to every tool designer and tool planner. In view of the great variety of parts to be produced, the expensive and time‐consuming trial and error method of die development should be reduced to a minimum. The problems of production, particularly forming problems, will be greatly simplified by the use of this same knowledge and information in the design of sheet metal parts. If the limits to which parts can be formed by the common methods are known and applied, a very large percentage of parts can be designed so that they may be formed readily and economically using as few operations as possible. If parts are designed so that they take advantage of new simplified methods, it is important that tools be made with close cooperation between the pre‐planned, tool planners, and tool designers.