ALTHOUGH, in general, curved members are “anathema” to the designer of structures, there are occasions on which they are desirable. For instance, curved members in the sides or top of a cabin or fuselage very often lead to a great improvement in the appearance and comfort of an aircraft. Again, spars with flanges of varying thickness have an effective camber, while cranked push ‐ and ‐ pull rods are obvious examples of this type of member. On these occasions an easy method of determining the strength of such a member is very desirable.
Atkin, E.H. (1935), "Slightly Curved Struts: An Easy Method of Determining the Strength of Awkwardly Shaped Beams or Struts", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 4, pp. 88-90. https://doi.org/10.1108/eb029922
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