GREAT progress has been made in recent years in both fields of aircraft design and manufacture. No longer is the designer completely in the dark regarding the operational loads his aircraft will have to sustain, nor completely ignorant of the capabilities of its structure. Progress has brought knowledge of the sort of operational load likely to be encountered in both flight and landing operations as well as powerful methods of analysis of aircraft structures. Even that, however, is not enough, for without a thorough understanding of the possibilities and properties of the materials at the designer's command, he cannot hope to utilize such knowledge to the full.
Howarth, R.M. (1947), "Some Elementary Considerations of the Stress‐Strain Curve: A Discussion of the way in which a Detailed Knowledge of the Behaviour of Materials under Load can be used to Give the Maximum Utilization, bearing in mind the Longer Flying Life of Equipment in use today", Aircraft Engineering and Aerospace Technology, Vol. 19 No. 12, pp. 372-377. https://doi.org/10.1108/eb031578
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