Abstract
The natural strain concept of Argyris is used to calculate are lengths and curvatures on each side of a doubly curved triangular shell element. These are able to be used directly to describe natural extensional, flexural and shear strains in the element. These are then transformed to orthogonal curvilinear strains on the shell surface, for which purpose direction cosines of the sides relative to curvilinear axes are estimated using simple but apparently accurate approximations based on the projection of the curved element on the plane defined by the vertex nodes.
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